Entry Type ID Date Applicable Rating System Primary Credit Inquiry (LIs) Ruling (LIs) Related Addenda/LIs Related Resources Campus Applicable Internationally Applicable Country Applicability Reference Guide (Addenda) Page (Addenda) Location (Addenda) Description of Change (Addenda) "LEED Interpretation" "10097" "2011-08-01" "New Construction, Core and Shell, Schools - New Construction, Retail - New Construction, Healthcare, Commercial Interiors, Retail - Commercial Interiors, Existing Buildings" "IEQc3.2: Construction IAQ Management Plan-Before Occupancy" "Overview: This CIR applies to Option 2- Air Quality Testing. With regards to the process to demonstrate that the maximum TVOC concentrations are below 500 micrograms/cubic meter, this CIR is requesting the acceptance of an alternate unit of measure based on a volumetric reading from an instantaneous, direct reading photoionization detector instrument (PID) using a 10.6 eVolt lamp. This reading would be recorded in a ppb (parts per billion) measurement and then converted to the designated unit of measure called out in the requirements (micrograms/cubic meter) using a conversion factor. This direct reading approach for TVOC will offer a more economical solution for IAQ testing by a factor of approximately two for our ~480,000 SF project. Methodology A conversion factor has been developed (by EH&E in Newton, MA) and is based on a TVOC ""fingerprint"" of 33 individual volatile organic compounds grouped by chemical category, resulting from a technical evaluation of the Building Assessment Survey Evaluation (BASE) data, the EPA TO-15 list of VOC\'s, and other relevant technical data. The EH&E team examined three lists of indoor VOC\'s to develop the TVOC ""fingerprint."" These lists originated the following sources: BASE dataset for commercial buildings, PID-readable chemical compounds, and an EPA approved list of indoor VOC\'s. Seven individual VOC\'s from the BASE data the had the highest reported concentrations and could be measured by a PID formed an initial, preliminary fingerprint. These individual VOC\'s were chemically regrouped (i.e. alcohols, halogenated hydrocarbon, aliphatics, etc.) and the relative group proportions in the fingerprint were compared with the BASE dataset. Based on the EPA guidance and a review of indoor VOC literature, additional VOC\'s not measured in the BASE dataset were considered for inclusion. By mapping additional pollutants from the EPA TO-15 list of VOC\'s, EH&E modified the fingerprint to represent new or existing buildings. The expanded list of compounds included all BASE compounds that were both on the EPA TO-15 list and measurable by the PID. This ""fingerprint"" is based on the following list of chemicals, sorted by their group, their average group molecular weight (AGMV), the % in BASE data, and specific compounds in fingerprint: Format given in following order: Group/AGMW/% in BASE/Compounds in Fingerprint Aldehydes/44.06/12%/Acetaldehyde Alkanes & alkenes/113.6/8%/n-undecane; n-decane; Nonane; Octane; n-hexane; 1,3 butadiene Aromatics/110.5/14%/d-limonene; a-pinene; Naphthalene; o-xylene; m- & p-xylenes; Ethylbenzene; Styrene; Toluene; Benzene Halogenated Hydrocarbons/130/15%/1,2 -dbromoethane; 1,2, 4-trichlorobenzene; 1, 2, -dichlorobenzene; Trichlorobenzene; 1,3,5 -trimethylbenzene; Chlorobenzene; 1,1 -dichloroethene; Vinyl chloride Alcohols/78.5/31%/2 -butoxyethanol; Phenol; 1 -butanol Ketones/58.1/15%/Acetone Other(e.g. acetates,sulfides, ethers, etc.)/92.55/5%/Butyl acetate; Dimethyl disulfide; Ethyl acetate; Carbon disulfide; t-butyl methyl ether Conversion Factor In order to convert a PID reading from part per billion (ppb) to a mass-based equivalent in micrograms/cubic meter, the PID value is multiplied by a derived conversion factor, MCF, defined below as the product of two correction factors, CF-1 and CF-2. For the TVOC fingerprint listed above, the formula is MCF = CF1 * CF2, where MCF = 2.70 Mass Conversion Factor CF1 = 0.88 Correction for predicted ppb PID reading to ""actual"" ppb reading, based on isobutylene equivalents, and CF2 = 3.07 Correction for ""actual"" ppb to micrograms/cubic meter equivalent, based on the chemical distribution of the mixture and the average molecular weight. Summary The acceptance of this CIR would provide a lower cost test for TVOCs, including the use of both hand held PID-TVOC direct read instruments and permanently installed PID-TVOC direct read instruments." "**Update January 1, 2014: This Interpretation is no longer valid. See LI 2467.\n\n **Update October 1, 2013 The applicant is requesting approval for use of a photoionization detector instrument (PID) to measure TVOC concentrations during air quality testing. The proposed alternative for testing of TVOC using a PID is not an approved method in the United States Environmental Protection Agency Compendium of Methods for the Determination of Air Pollutants in Indoor Air which are the methods required for this credit. The IAQ testing must be conducted according to the test procedure outlined in the referenced standard using an approved indoor TVOC measurement device, which is either Method IP-1A, Stainless Steel Canister, or IP-1B, Solid Adsorbent Tubes. Both of these methods utilize GC/MS analyses to determine the concentrations of the collected VOC\'s. Most laboratories will calculate the total concentration of VOC\'s (TVOC) according to a toluene equivalent mass from the Total Ion Chromatogram (not just the peaks of EPA TO-15 compounds, but the integrated area of the peaks from all compounds). This method is discussed in the California Department of Health Services (CDHS) Standard Practice. http://www.ciwmb.ca.gov/greenbuilding/Specs/Section01350 First of all PID analyses miss many of the common indoor VOC\'s such as aldehydes and aliphatics and has a poor response factor (i.e. and thus large uncertainty) for common indoor VOC\'s such as alcohols. The ""fingerprint"" method proposed for calibration of the PID is fundamentally flawed in that it uses a calibration based upon an assumed fixed percentage of mass of VOC\'s from seven different groups of VOC\'s while the actual mass percentage of VOC\'s can vary widely from building to building. The errors associated with the ""fingerprint"" method could be easily demonstrated by simultaneously measuring the TVOC concentration with a PID and either method IP-1A or IP-1B in a number of buildings. Such a comparison was conspicuously missing from the EH&E report ""Development of a Method to Convert Total Volatile Organic Compound Measurements in Buildings to Equivalent Mass Based Units"", although the report did contain numerous caveats regarding the accuracy of the ""fingerprint method"" including limitations related to the ""Representativeness of TVOC List"" and the ""Variability by Building Type"". Additionally, the LEED-NC v2.2 Reference Guide states that samples must be collected over a minimum 4-hour period; instantaneous TVOC measurements do not satisfy this requirement.Applicable internationally." "None" "None" "X" "LEED Interpretation" "10222" "2012-07-01" "New Construction, Commercial Interiors, Retail - Commercial Interiors, Healthcare, Retail - New Construction" "IEQc3.2: Construction IAQ Management Plan-Before Occupancy" "The project is a training complex in Oklahoma. The new facilities consist of two new B/COF buildings. We intend to conduct baseline IAQ testing, as outlined in option 2. We would like clarification in determining the number of sampling locations within the buildings. The two B/COF buildings each have three floors and encompass approximately 93,000 square feet. For these two buildings, three Dedicated Outside Air Systems (DOAUs) distribute outside air throughout each B/COF building; however, separate Water Source Heat Pumps (WHPs) condition the outside air delivered to each room. Each B/COF building contains 150 residential barracks units which each have a separate WHP. In addition, each B/COF building has identical rooms whose HVAC needs are provided by identical WHP units (e.g., identical offices, identical lounges, and identical learning centers). Following the guidance provided by the LEED for New Construction Version 2009 Reference Guide, each B/COF building would require 184 sampling locations. We propose the following alternative compliance path for multi-family, residential projects with similar rooms and residential units: Per the guidance provided by LI 1740 dated 05/30/2007 , If the delivery of outside air on an air change per hour basis and the materials in a ventilation zone are identical (e.g. a specific type of hotel room, or apartment/condominium with separate ventilation systems) a HERS random sampling plan may be employed (i.e. random 1 in 7 selection from each model of room). In addition, for buildings with large numbers of identical rooms each with separate ventilation systems, a minimum of 3 rooms for a particular model of room shall be deemed sufficient. If one or more of the three measurements made per model room fail, then an additional three of that type guest room are tested. All failed rooms will be re-tested following flushing with outside air. Furthermore, per the guidance provided by LI 5209 dated 04/21/2009, an acceptable strategy for each individual unit type configuration, is a minimum of 3 samples are taken for each identical unit type. (Note: In this case, the minimum of 3 samples refers to three Indoor Air Quality (IAQ) sampling locations for each similar unit type.) Implementing the minimum of three (3) rooms for a particular model of room, we estimate that a total of twenty-seven (27) sample sets will be required in each B/COF building. Per this methodology, identical Dwelling Units will be grouped together and a minimum of 3 sampling locations will be included in the Indoor Air Quality Testing. In the same manner, similar room types with identical ventilation units and rates (i.e. computer learning rooms) will form a separate group upon which a minimum 3 sampling locations will be included. As stated above, this methodology is based on the LI 1740 dated 5/30/2007 for LEED NCv2.2 and LI 5209 dated 04/21/2009. For this project, all Dwelling Units are identical. In each B/COF building, 6 WHP\'s serve 6 identical Dwelling Units and the corridors on the Northeast and Northwest corners of each floor. Although corridors are not considered occupied space per ASHRAE 62.1-2007, the delivery of outside air on an air change per hour basis and the materials in these ventilation zones differ from the remaining Dwelling Units. Per this methodology, these 6 Dwelling Units will be grouped together and 3 sampling locations will be included in the Indoor Air Quality Testing. The remaining 144 identical Dwelling Units are served by separate identical WHP\'s and 3 sampling locations will be included. The remaining groups are served by identical WHP\'s per group, and thus will include 3 samples each for the identical Drill Instructor Rooms (1 per floor), identical Laundry/Vending Rooms (1 per floor), identical Day Rooms (1 per floor), and identical Computer Learning Rooms (1 per floor) for a total of 12 sampling locations. For zones without identical rooms each served with separate ventilation systems, the original guidance will be followed, and the number of sampling locations for each separate ventilation system will not be less than 1 per 25,000 square feet or for each contiguous floor area, whichever is larger. Thus, an additional 9 sampling locations will be included. Please confirm if this alternative compliance path meets the credit intent. If this is not acceptable, please clarify how the IAQ testing option may be applied to projects with identical residential units or rooms that have separate ventilation units but equal ventilation rates based on air changes per hour and identical materials within each unit or room. " "The project is inquiring if the proposed sampling for two barrack buildings, each with 150 residential barrack units, offices, lounges, and learning centers satisfies IEQc3.2, Construction IAQ Plan Before Occupancy. As stated in LEED Interpretation 1740, a sampling approach according to HERS guidelines of one in seven of identical spaces is acceptable. Therefore each sample group would consist of identical spaces, one out of every seven of which are to be tested. The LEED Interpretation also allows for a minimum of 3 tests in each sample group, if there are more than 21 identical spaces in a sample group. For example, one sample group might have 1 unit/space in it and another might have 50 identical unit/spaces in it. You would test one in the first sample group, and a minimum of three in the second sample group. Without more information on the number of identical spaces in each sample group, it is unclear if the proposed option completely satisfies the requirements. Note that HERS has specific guidelines in case of test failures in order to continue with a sampling approach. The sampling plan developed for the project, must observe HERS guidelines on what to do in the event of a test failure." "1740, 5209" "None" "LEED Interpretation" "1330" "2005-12-06" "New Construction, Schools - New Construction, Commercial Interiors" "IEQc3.2: Construction IAQ Management Plan-Before Occupancy" "The following is an alternative compliance path to EQc3.2 for the testing procedure for the detection of 4-PCH: BACKGROUND: The project is a small 1-storey office building. An indoor air quality testing procedure was conducted prior to occupancy in compliance with the EPA referenced standard. The report indicated that all levels were below the required limits except 4-PCH. Unfortunately, the detection limit of the equipment used for 4-PCH was 18-23ug/m3. The maximum 4-PCH level required by the IAQ testing protocol for LEED is 6.5ug/m3, based on the precendent from CIR ruling 11/29/2004. 4-PCH is a contaminant almost exclusively found in carpet backing using Styrene-butadiene latex rubber (SBR). The carpet installed has SBR backing but also complies with the requirements of EQc4.3, which limit the level of 4-PCH to less than 0.05 ug/m2/h, in keeping with the Carpet and Rug Institute\'s Green Label specifications. The project cannot retest for 4-PCH with more sensitive equipment because the building has been occupied for some time now, so the results would be meaningless at this point. We believe we can demonstate compliance to the 4-PCH level requirements through an alternative path, which involves calculating the maximum emissions possible and comparing this with the LEED requirement: Although the carpet contains SBR backing, it does meet the Carpet and Rug Institute\'s Green Label specifications for 4-PCH, which are 0.05 ug/m^2/h. Given that the gross square footage of the building is 9,000 SF (836.4 m^2) and the average ceiling height is 15 FT, the volume is therefore 135,000 FT^3 (3,823 m^3). If we assume the carpet emits 4-PCH at a rate of 0.05 ug/m^2/h (maximum possible emission factor for compliance), then the maximum emission rate the whole carpet could have, if applied to the entire floor area, is: (0.05 ug/m^2/h) x (836.4 m^2) = 41.8 ug/h. Therefore, the maximum 4-PCH emissions that could possibly contaminate the indoor air (without even considering the introduction of outdoor air) is: (41.8 ug/h) / (3,823 m^3) = 0.011 ug/m^3/h Since the maximum 4-PCH level required by the IAQ testing protocol for LEED is 6.5 ug/m^3, it would take 590 hours (25 days) for the 4-PCH to reach this level, if the carpet were inside a sealed box with the same inside volume as the building. Since the carpet is not in a sealed box, and since there will be at worst case conditions at least 25% outdoor air mixed into the air stream, it is reasonable to assume that the 4-PCH levels will never reach 6.5 ug/m^3. We believe this calculation method demonstrates compliance with the credit requirements for 4-PCH levels." "Your proposed calculation method, in combination with the air quality testing, is acceptable to demonstrate achievement of this credit - with two qualifications. First, you state that, ""all levels were below the required limits except 4-PCH"". From your proposal, we assume that the results for 4-PCH were ""non-detect"", but you do not specifically state that this is the case. Clearly, your proposed method only works if your test results indicated ""non-detect"" for 4-PCH. Second, in order to solidify your approach: instead of making a final assumption, complete the calculation by estimating the 4-PCH steady state. Employ a simple calculation for the building as a whole. Applicable Internationally. " "None" "None" "X" "LEED Interpretation" "1440" "2006-02-23" "New Construction, Schools - New Construction, Commercial Interiors" "IEQc3.2: Construction IAQ Management Plan-Before Occupancy" "This project is a 147,000 call center. The owner procures air quality testing services on all their new and existing buildings and have done so before they ever did any LEED projects. They recognize the value of superior air quality in terms on worker productivity and avoidance of risk. On this new project the contractor was very diligent in ensuring that low VOC paints, adhesives and sealants were used. No wood materials with added Urea formaldehyde were allowed on the project. The contractor collected MSDS sheets on all these materials. All the carpet meets the CRI Green Label Plus certification. The contractor developed and implemented a Construction Indoor Air Quality Management Plan which followed the SMACNA guidelines for buildings under construction. (The project will not achieve the LEED credit EQc3.1 because there was no MERV 13 filtration provided) In order to ensure superior indoor air quality at the new facility the team is employing air quality testing. Along with testing for the elements required for this credit the team will also test for mold. The testing team is utilizing the EPA Protocol for Environmental Requirements, Baseline IAQ and Materials, for the Research Triangle Park Campus, Section 01445 as required per the LEED Reference Guide credit EQ3.2. The team also referred to the guidelines in the LEED CI Reference Guide credit EQ3.2 for air testing in occupied buildings. The testing began before the building was occupied and the tests for Formaldehyde and total VOC\'s appeared to be within the required levels although all results are not yet in. The testing for particulate level was quite high. The cause of the high particulate appears to be dust in the underfloor area and mechanical rooms. Since the initial testing the building has been about 25% occupied. The underfloor areas and mechanical rooms have been cleaned again. The building ventilation system will provide minimum ventilation rate 3 hours prior to daily occupancy and continue while the space is occupied. The rate of outside air will be at least .30 cfm / sq ft. If levels are exceeded the space will be flushed out by increasing the rate of outdoor air during unoccupied hours. Any additional adjustments to the mechanical system will addressed if needed. Additional testing will be done until all the required test samples meet the concentration levels. Can this method be used to meet the requirements to achieve credit EQc3.2?" "You are essentially asking if it is acceptable to continue the IAQ testing and contaminant mitigation activity while the building is partially occupied. The owner\'s actions are commendable, but unfortunately your proposal is not acceptable. The referenced EPA standard states that flush-out, retesting, and compliance with contaminant limits must all be completed before occupancy, and the Technical Advisory Group has chosen not to diverge from it. Instead, the TAG recommends that you examine your occupancy and ventilation schedules to see if you conformed to the flush-out schedule described in EQc3.2 ruling dated 9/8/04. Applicable Internationally. " "None" "None" "X" "LEED Interpretation" "1545" "2006-07-29" "New Construction, Schools - New Construction, Commercial Interiors, Core and Shell" "IEQc3.2: Construction IAQ Management Plan-Before Occupancy" "The project is approx 75,000 sf over five floors with phased occupancy. The EQ Credit 3.2 Flush-out Procedure compliance path was not employed as each floor, at approx 18,000 ft2 per floor, would need to be ventilated with 3500 ft3/ft2 prior to occupancy for a total of 63,000,000 ft3 of outside air. Due to the existing building mechanical systems, the maximum outside air supply was limited to roughly 5000 ft3/min (CFM) per floor. Based on this rate, it would require almost 9 days of flushing prior to occupancy. Unfortunately, because of the tight construction/occupancy schedule, this was not possible. Therefore, the IAQ Test Procedure compliance path was employed prior to occupancy of each floor. Great care was taken in specifying LEED-compliant low emitting materials and furnishings, so the random elevated concentration levels of Total Volatile Organic Compounds (TVOC) were not anticipated. As per EQ Credit 3.2 Table 1, TVOC concentrations shall not exceed 500 micrograms per cubic meter (ug/m3). All other IAQ parameters: Formaldehyde, Particulates (PM-10), 4-Phenylclohexane (4-PCH) and Carbon Monoxide (CO) were well below the Maximum Contamination Concentration Levels detailed in EQ Credit 3.2 Table 1. The use of the same low emitting materials and furnishings is consistent on all floors. TVOC results are as follows: Main Floor Reception: May 9/10 initial - 1240 ug/m3; July 4/5 follow-up - awaiting results 2nd Floor: May 15/16 initial - 500 ug/m3 3rd Floor: Apr 5/6 initial - 1060 ug/m3; Apr 24/25 follow-up - 620 ug/m3; July 4/5 follow-up - awaiting results 4th Floor: Apr 23/24 initial - 150 ug/m3 5th Floor: Apr 6/7 initial - 960 ug/m3; Apr 24/25 follow-up - 150 ug/m3 An element that was beyond the tenant and project team\'s control was the installation by the landlord of base building PVC roller shades on the perimeter glazing just prior to occupancy. The manufacturer does not have emissions testing data available for the PVC shade cloth. Although the floors are occupied, we re-tested the Main and 3rd floors this week and are confident the TVOC concentrations will be below 500 ug/m3. The tenant has a strong commitment to the health and well-being of the building occupants as illustrated by their willingness to re-test floors where the TVOC concentrations exceed 500 ug/m3. In addition to attempting EQ Credit 3.2, the tenant plans to employ continuous IAQ monitoring of HVAC system related parameters (CO2, temperature, humidity and CO) as a method for assessing the effectiveness of the building systems in providing optimal indoor air quality for the occupants. Based on the above results and circumstances, does our alternative compliance path meet the intent of EQ Credit 3.2 and thus achieve a point?" "The inquiry suggests that the project has been occupied prior to achieving the concentrations below the required limits. Thus, the credit cannot be achieved. In order to meet the intent and requirements of EQ Credit 3.2, testing must be conducted after all construction and installation have been completed, even for items outside the tenant\'s direct control, and prior to occupancy. Applicable Internationally." "None" "None" "X" "LEED Interpretation" "1561" "2006-09-05" "New Construction, Schools - New Construction, Commercial Interiors, Existing Buildings" "IEQc3.2: Construction IAQ Management Plan-Before Occupancy" "The East and North Wing Addition project Hospital is comprised of two phases, three new additions totaling 167,580 GSF and renovations of 25,065 GSF. From the owner\'s perspective, these are two separate sub-projects. The overall project includes two attached and one detached building additions, respectively: a) The North Building Addition, at 30,850 new GSF, will house the relocated Central Sterile Supply (CSS), Surgery Expansion (OR) and Food Services Expansion, along with a Mechanical Room to support the new building. This building, which ties the Main Hospital to the Central Plant at the Ground Level, is designed for both vertical (three floors plus a mechanical penthouse) and horizontal expansion to the North. Included within this section is a planted green roof. b) The East Building Inpatient Tower, totaling 136,730 new GSF, will accommodate the relocation of the Intensive Care Unit (ICU), Emergency Department (ED) expansion, Telemetry Care Unit (TCU), and more Orthopaedic Inpatient beds, as well as a new Lobby, Mechanical Room and Mechanical Penthouse to support the new tower. This tower also includes two shelled floors - the fitout of one floor is an alternate still under consideration at this time. A walled garden off the Level 2 ICU rooms is included to screen patients from motorists and pedestrian traffic. c) A detached metal building, to match the existing Central Plant in appearance, will be constructed to house a new and one future chiller, a cooling tower and a future additional cooling tower. An additional cooling tower replacement and associated piping work is also scheduled within the original Central Plant. We proposed to comply with this credit in the following way: New Construction: In this section, the two-week flush out period will be completed. Renovation: Since this section is renovation, tying into new and existing mechanical systems and accomplished in multiple sub-phases, we propose to comply with EQ3.2 for this portion using the testing methods identified in CIR dated 10/8/2002. Is this approach to compliance is acceptable?" "The building flush-out and IAQ testing strategy proposed is acceptable, provided that existing spaces are protected from construction-related contamination as well as prevention of cross-contamination between systems. Protection measures should follow the SMACNA Guidelines for Occupied Buildings and be outlined in the Construction IAQ Management Plan to ensure compliance." "None" "None" "LEED Interpretation" "1598" "2006-10-23" "New Construction, Schools - New Construction, Commercial Interiors, Existing Buildings" "IEQc3.2: Construction IAQ Management Plan-Before Occupancy" "BACKGROUND This credit interpretation request is specific to interpretation of EQ Credit #3.2 ""Construction IAQ Management Plan: Before Occupancy "" under version 2.1. The intent of this credit is ""to prevent indoor air quality problems resulting from the construction process in order to help sustain the comfort and well-being of construction workers and building occupants"". We believe the approach described below will achieve that intent. The Mazankowski Alberta Heart Institute Project is an expansion to the Walter C. MacKenzie Center, an existing active treatment hospital of approximately 2,000,000 square feet of occupied space. The Mazankowski Alberta Heart Institute will connect to the Walter C. MacKenzie Center through several corridors that will be isolated from the main building until the Heart Institute is occupied. The heart institute is a multi-storey building of approximately 350,00 Square Feet of occupied space consisting of 8 occupied floors each with an interstitial floor above to house building systems. The interstitial floors are completely separated from the occupied floors. The ventilation systems serving the building are configured such that central air systems provide 100% outdoor air to all occupied floors from the 2nd floor to the 8th floor. The main and lower levels are served from air systems that re-circulate a portion of the building air. Each occupied floor and each interstitial floor are separated into a minimum of 3 Fire compartments. Supply and exhaust air for each fire compartment can be isolated by closing smoke dampers in the supply and exhaust ductwork serving the respective fire compartment. The construction and occupancy schedule for the project requires that the building be occupied in stages. These stages would be at a minimum fire compartment by fire compartment and more likely floor by floor. REQUEST We are requesting that the USGBC interpret Credit 3.2 to allow ""Before Occupancy"" flushing to be conducted on a fire zone by fire zone basis for the Mazankowski Alberta Heart Institute. All unoccupied zones would be isolated from the occupied zones by closing the smoke dampers and taping off man doors serving unoccupied zones. The zones being flushed would utilize the main air systems to allow for the two-week building flush out period prescribed in the discussion for EQ Credit #3.2. The 2nd through 8th floors are served by air systems designed to provide 100% outdoor air. Therefore there will be no recirculation of the air from the occupied or flush-out spaces. For the lower and main floors served by a system that permits re-circulated air, these systems will be controlled so that 100% outdoor air is supplied through this system during the flush out period." "The CIR is inquiring if it is possible to conduct the two-week flush-out of a building in stages to allow for a staggered construction completion schedule. The inquiry indicates that the building floors and/or zones can be separated physically from adjacent spaces, to ensure no cross contamination from construction in the incomplete areas, while providing 100% outside air to accomplish the flush out. Previously posted CIR rulings, dated 10/17/2001 and 9/5/2006 approve the process for a staggered flush-out approach, provided that existing spaces are protected from construction-related contamination as well as prevention of cross-contamination between systems. Protection measures should follow the SMACNA Guidelines for Occupied Buildings and be outlined in the Construction IAQ Management Plan to ensure compliance." "None" "None" "LEED Interpretation" "1740" "2007-05-30" "New Construction, Commercial Interiors, Schools - New Construction, Retail - New Construction, Retail - Commercial Interiors, Healthcare" "IEQc3.2: Construction IAQ Management Plan-Before Occupancy" "We have a ~100,000 square foot 3-pointed T-shaped building with five floors. On the first floor there is an additional 7,800 sq. ft single story extension that will be used for a cafeteria and kitchen. The other sections are approximately 5,500 sq. ft. on each of floors 1 - 5 for a total of approximately 16,500 sq. ft. per floor. Each section is attached to a core and has similar furnishings and usage including both open and private offices and conference/training rooms with the following exceptions: the first floor includes an entrance lobby and the second floor includes a movable filing area and a server room. The HVAC system utilizes variable air volume boxes with induction fans. Separate air handling units (AHUs) in each section on each floor serve the three main vertical sections. There is one outdoor air fan on the roof above each section (3 total) which supply outside air down to the respective sections\' five AHUs. There are an additional nine ceiling-mounted AHUs for the cafeteria and one unit for the kitchen. These ten units are supplied with outside air through one rooftop intake fan that is ducted to each unit. In summary, there are fifteen main AHUs, nine cafeteria AHUs, and one kitchen AHU (25 total). If one were to interpret a ""separate ventilation system"" as each individual AHU, this would infer 25 sampling locations, which is pointlessly excessive and costly for a 100,000 square foot building. It risks returning to the days when no IAQ testing was done because there was no cost effective protocol in the LEED credit system. We see no technical reason why the criterion should be based on individual AHUs. Identical AHUs used to serve multiple zones all deliver the same volume of outside air per person per ASHRAE requirements for the respective space use. The volume of outside air in supply air varies with time, not by zone i.e. with variations in outside air temperature. The point sources of indoor air pollutants in and around the building and its mechanical system, and their treatment, will be independent of the number of air handling units used to serve the building. If a building designer uses one four-ton AHU vs. four identical one-ton AHUs, what will sampling in four locations achieve? Due to the unique T-shaped design, the building core breaks what would have been contiguous floors into separate areas. While these areas are not physically contiguous, they have similar furnishings and space usages, which present similar indoor pollutants. In order to re-establish an economically and logistically sound method for wide use across multiple building formats, we have selected this project to seek clarification on the following terms: 1) ""separate ventilation system"" in a building with numerous AHUs and 2) ""contiguous floor area"" in unusually shaped buildings. We propose that for each portion of the building served by a separate ventilation system, the number of sampling points must not be less than one per 25,000 square feet, or for each contiguous floor area, whichever is larger, with the following clarifications: 1) Allow contiguous floor area to be defined as areas with similar furnishings and space usage, even if the space crosses a building core (but not up or down a floor). 2) Require at least one sample in each building use location, i.e.. cafeteria vs. office vs. warehouse (server rooms are not included since they are not regularly occupied). 3) Allow ""separate ventilation system"" to be defined as fundamentally different HVAC designs, i.e.. heat pumps vs. built-up units vs. TDV (underfloor) vs. overhead mixing. Following the above protocol, we propose to sample six locations in this building: 1st Floor Cafeteria 1st Floor Lobby 2nd Floor Filing Area 3rd Floor Private Office 4th Floor Training Room 5th Floor Open Office (A ""separate ventilation system"" could be interpreted as AHUs served by a common outside air source. This would require excessive sampling in buildings equipped with small rooftop package units and thus is not practical.)" "Per the LEED-NCv2.2 requirements, the number of sampling sites would be one per each of the separate ventilation systems. The NCv2.2. requirement for one sampling location in ""each portion of a building served by a separate ventilation system"" is based upon the fact that the ventilation systems define a distinct mixed volume of indoor air as tested under the required minimum outside air percentage mode. Since there may be expected to be variations in the indoor air concentrations in this mixed zone, there is a further requirement that the area in the zone with the least ventilation and greatest presumed contaminant source strength be tested. The contaminants in this mixed volume of air are determined by the emissions from the materials in the air space and the amount of outside air being delivered to the air space. As both the materials and the outside air delivery rates in different ventilation system zones can vary, separate air contaminant measurements are required for each ventilation system zone. If the delivery of outside air on an air change per hour basis and the materials in a ventilation zone are identical (e.g. a specific type of hotel room, or apartment/condominium with separate ventilation systems) a HERS random sampling plan may be employed (i.e. random 1 in 7 selection from each model of room). In addition, for buildings with large numbers of identical rooms each with separate ventilation systems, a minimum of 3 rooms for a particular model of room shall be deemed sufficient. If one or more of the three measurements made per model room fail than an additional three of that type guest room be tested. All failed rooms will be re-tested following flushing with outside air. In this specific case, if the cafeteria space is one undivided open space with identical (not just similar) materials throughout the space and the delivery of outside air on an air change per hour basis is identical for each system, then a HERS random air sampling of 1 in 7 of the 9 ventilation system zones is acceptable. Thus, 2 test locations are required for the cafeteria space (i.e. randomly select 2 of the 9 ventilation system zones) and these locations shall include the area with the least ventilation and greatest presumed contaminant source strength in each zone. The kitchen, which is both a separate space with a separate ventilation system and different materials requires a second test location. Again, to include the area with the least ventilation and greatest presumed contaminant source strength is acceptable. The five floors of the main building with three separate ventilation systems that serve separate spaces with different materials requires one sampling location per ventilation system, again to include the area with the least ventilation and greatest presumed contaminant source strength is acceptable. Thus, a total of 18 test locations are required, two in the cafeteria, one in the kitchen and 15 in the main building." "10222" "None" "LEED Interpretation" "1747" "2007-08-08" "New Construction, Schools - New Construction, Commercial Interiors" "IEQc3.2: Construction IAQ Management Plan-Before Occupancy" "The open section of our distribution center is approximately 540,000 sf and is essentially one large room with open racks, a 37\' high clg and peak occupancy of 76 people (approx. 7100 SF per person). There are 6 identical rooftop heating units and 13 makeup air units, each serving about 90,000 sf. Since the project is pursuing EQc4.1and EQc4.2 there are no presumed contaminate sources in the building materials in this space (concrete slab, precast concrete walls, steel deck and steel racks) and given that this is a completely open distribution center with an active destratification system, we expect absolutely no deviation in the test results in each area. Therefore, we are proposing to test the six zones served by the rooftop units with one test canister in each zone. We believe this strategy is the most fiscally and environmentally responsible one for this project type-an open distribution center. Sampling every 25,000 sf instead of 80,000 sf would waste money that is preferred for other green strategies, and would waste natural resources embodied in the canisters. Please comment on the 90,000 SF testing zone. If higher-than expected contaminant levels are detected in the process, we will flush-out the building and retest. Air quality testing in the remainder of the building including 10,000 SF to 12,000 SF of offices will meet the criteria in the reference manual." "The applicant has proposed to change the credit requirement for sampling every 25,000 SF to sampling every 90,000 SF for this building. Based on the narrative provided, this change is not permitted. The required 25,000 SF sampling area has been established as an upper limit for appropriate sampling areas based on contaminant dispersion characteristics. Given a point source of contamination, larger sampling areas may not result in detection of the contamination. As the characteristics of contaminant dispersion do not depend on the scale of the building or open area considered, the project must abide by the 25,000 SF criteria. Applicable Internationally." "None" "None" "X" "LEED Interpretation" "1902" "2007-09-18" "New Construction, Commercial Interiors, Schools - New Construction" "IEQc3.2: Construction IAQ Management Plan-Before Occupancy" "This CIR is submitted in relation to the implementation of LEED NC 2.2 Credit EQ 3.2 as it relates to a Data Center facility. Based upon our review of the existing CIRs there does appear to be a related CIR raised under the NC 2.1 program dated 1/18/2007, however it is not clear as to whether this ruling is applicable to NC 2.2. This previous NC2.1 CIR ruled that when applying the 14,000 ft3 / ft2 alternate approach (which is in effect the NC 2.2 credit criteria), that In order to achieve EQ credit 3.2, all ""Occupied spaces"" as defined in ASHRAE 62.1-2004 must be adequately flushed out. Spaces not classified as ""Occupied spaces"" under ASHRAE 62.1-2004 are not covered by this credit. Further research has found that the ASHRAE 62.1:2004 definition of an ""Occupied Space"" is ""An enclosed space intended for human activities, excluding those spaces intended primarily for other purposes, such as storage rooms and equipment rooms, that are only occupied occasionally and for short periods of time"" Based upon the above information, we are seeking confirmation that the following areas within a datacenter facility are not classed as ""occupied space"" per the AHSRAE 62.1:2004 definition - due to their occasional and short occupancy periods - and as such are not covered by this credit and consequently can be omitted from the 14,000 cfm / sq ft flush out calculation. o Server Rooms o UPS / Battery Rooms o Mechanical Rooms o Electrical Rooms To achieve credit EQ3.2 we therefore propose to undertake a flush out of all offices, circulation space and other areas that fall under the ASHRAE 62.1:2004 definition of an ""Occupied Space"", based upon our assumption stated above. Please confirm that this strategy for achieving credit EQ3.2 is acceptable." "The inquiry is asking whether the requirements of EQc3.2 (construction IAQ management, prior to occupancy) apply to areas that cannot be considered as occupiable space (per ASHRAE Standard 62.1-2004 definition). The requirements of EQc3.2, namely flush-out with 14,000 cfm/sq ft of outside air, apply to all spaces that are within the building envelope; the credit does not differentiate between occupiable and non-occupied spaces.\n\n **Update October 1, 2013: Applicable credits were updated." "None" "None" "X" "LEED Interpretation" "1937" "2007-10-31" "New Construction, Schools - New Construction, Commercial Interiors, Core and Shell" "IEQc3.2: Construction IAQ Management Plan-Before Occupancy" "Our project is a Tenant fit-out, which will occupy almost 70% of a new 2.1 million sq. ft. urban office tower. The base building is separately pursuing LEED-CS certification and NY State Green Building Tax Credit (GBTC). We request recognition of credit equivalency for Option B ""IAQ Test Procedure"". We propose to take a comprehensive approach to meet the intent of the credit -- to ""reduce indoor air quality problems resulting from the construction/renovation process, to sustain long-term worker and occupant comfort and wellbeing"". Flush-out: To meet GBTC requirements, a one (1) week flush-out will be performed throughout the entire building (both Core & Shell AND Tenant spaces), with 100% outside air at 50% air flow rate, for 24 hours a day. Flush-out will occur after construction and immediately PRIOR to tenant occupancy on each floor. Continuous Air Monitoring: The building Owners have contracted to install the Aircuity OptiNet system, which provides 24/7 continuous monitoring and reporting of IAQ conditions, 365 days per year. Aircuity is a direct reading, multi-point system with the capability to continuously measure TVOC\'s, particulate matter (PM2.5, more stringent than LEED criteria), CO and CO2. The Owners will install the base Aircuity system with sensors in Core & Shell spaces, and provide infrastructure for all Tenants to install monitoring points and connect to the base system. Our Tenant fit-out project will install Aircuity sensors on all of its floors, to allow air sampling for each 3,000 sq. ft. of floor area. The Aircuity system will be operational during the latter stages of construction and will allow the Owners and Tenants to observe background levels of airborne contaminants, examine the decay progression for contaminant levels, and remediate as needed (e.g., increase ventilation) if signals or readings remain at elevated levels. Construction IAQ Management: All contractors for both Core & Shell and Tenant Fit-out projects are adhering to a Construction IAQ Management Plan, in accordance with LEED criteria. Compliance with Plan objectives is strictly monitored and enforced by on-site IAQ representatives. For both Core & Shell and Tenant Fit-out projects, this Plan includes source control strategies to reduce VOC\'s, formaldehyde and other emissions. Both projects are pursuing EQ credits 4.1 through 4.4 and installing low-emitting adhesives, sealants, paints, coatings, carpet and composite wood. The Tenant Fit-out has also specified all low-emitting systems furniture and seating to comply with LEED-CI EQ credit 4.5. In addition, the base building has prohibited both urea- and phenol-formaldehyde in all composite wood used for millwork, to meet GBTC requirements. The one-week flush-out, continuous air monitoring and construction IAQ management measures, as described above, will all be performed PRIOR to occupancy. Indoor Air Quality Testing: After occupancy of Tenant spaces, the Owners will perform IAQ testing to satisfy GBTC, which requires that testing occur within the first 30 days after occupancy in all Core & Shell AND Tenant spaces. Testing will encompass all contaminants required under LEED-CI: Formaldehyde, Particulates (PM10), Total VOC\'s and Carbon monoxide (testing for 4-PCH will not be required, since carpets do not contain SB latex backing). The Aircuity system will be used for IAQ testing of particulates and CO. For VOC\'s and formaldehyde, a laboratory analytical method will be employed. Summary: The above approach deviates from LEED-CI requirements in terms of the timing of IAQ testing (before vs. after occupancy). However, we believe the potential risks to occupants are reduced by several mitigating measures to be performed PRIOR to occupancy: (1) one-week flush-out, (2) continuous air monitoring and remediation, and (3) source control and IAQ management practices throughout construction. Please advise if the above comprehensive approach is acceptable to satisfy the intent of this credit." "The project team is requesting an alternative compliance path for EQc3.2. EQc3.2 requires either a building flush-out or IAQ testing before occupancy. The approach proposed by the project team does not qualify as an acceptable compliance path for two reasons. 1) The proposed building flush-out protocol does not ensure that the same volume of air will be circulated through the building as required by the credit. Credit requirements, per the LEED-CI Reference Guide, require that the building flush-out consist of either: Prior to Occupancy: Supplying 14,000 cu.ft. of outdoor air per sq.ft. of floor area while maintaining an internal temperature of at least 60 degrees F and relative humidity not higher than 60%, OR Occupancy Prior to completion of Flush-Out: Supplying a minimum of 3,500 cu.ft. of outdoor air per sq.ft. of floor area of the space. Once a space is occupied, it shall be ventilated at a minimum rate of 0.30 cfm/sq.ft. of outside air. These conditions shall be maintained until a total of 14,000 cu.ft./sq.ft. of outside air has been delivered to the space. 2) LEED requires that IAQ testing be completed after construction ends and before occupancy to ensure that occupants have healthy indoor air quality from the very first day of occupancy. The proposed protocol would not ensure this. Applicable Internationally. " "None" "None" "X" "LEED Interpretation" "1955" "2007-12-01" "New Construction, Core and Shell, Schools - New Construction, Healthcare" "IEQc3.2: Construction IAQ Management Plan-Before Occupancy" "The project contains both systems furniture (42"" application) for open areas, and modular wall systems (full height application that is demountable and reusable such as the DIRTT system). We are trying to schedule flush-out activities and understand from other CIRs that furniture installation may occur during or after flushout. Are modular walls as described here considered furniture?" "Full height, demountable modular walls are essentially the same in form and function as permanent walls and as such are not considered furniture. They must be installed in the building prior to flush-out for the purposes of EQc3.2. Please note that such modular walls potentially affect other LEED credits (such as daylighting and views) and should therefore be included in any calculations and submissions required for those credits as well. Applicable Internationally.\n\nUPDATE October 1, 2012: This LEED Interpretation is not applicable to LEED-CI. Furniture must be installed before the flush-out for LEED-CI projects." "6017, 5976, 5598, 5979" "None" "X" "LEED Interpretation" "2320" "2008-10-08" "New Construction, Schools - New Construction, Commercial Interiors, Existing Buildings" "IEQc3.2: Construction IAQ Management Plan-Before Occupancy" "The 9/5/2006 allows projects to provide both IAQ testing and building flush-out in different construction phases. We intend to provide IAQ testing and building flush-out in different areas of the building within the same construction phase. Our project is a high school addition/renovation that will be occupied in phases. The first phase of construction is complete and those spaces were tested, prior to occupancy, based on the credit ruling dated 10/8/2002. The second phase of the project includes a pool and academic spaces. We are concerned that the chemicals used in the pool will adversely impact the testing results. We therefore propose flushing out that space, using the \'purge mode\' on the pool\'s mechanical unit. Based on the 9/8/2004 credit ruling, we will achieve 14,000 cu ft of outdoor air per square foot of floor space in less than 5 days. As the rest of the Phase 2 areas will not meet the flush-out criteria prior to the scheduled occupancy, we therefore intend to provide IAQ testing in the remaining portions of the building. Until both the IAQ testing and the flush-out is complete, we will prevent cross-contamination between areas. Protection measures will follow the SMACNA Guidelines for Occupied Buildings as outlined in the Construction IAQ Management Plan. Please confirm if the proposed compliance path meets the credit intent. If it is not acceptable, please clarify what changes are required in order to meet the credit requirements." "The applicant is requesting clarification regarding the implementation of flush-out procedures and IAQ testing during the same construction phase. As described, the proposed approach appears to satisfy the credit intent. The indoor air quality problems from construction activity in each space are either reduced from a flush-out or confirmed to be minimal from IAQ testing. Please note, however, that IAQ testing procedures for LEED-NC v2.2 are outlined in the LEED-NC v2.2 Reference Guide and are not identical to the testing procedure outlined in the 10/8/2002 CIR (applicable to LEED-NC v2.1). The reference guide has more stringent maximum concentration requirements and additional testing procedure guidelines. Also note, the air contaminants from swimming pool chemicals, such as chlorine, will not affect the concentration levels tested for this credit. Applicable Internationally. " "None" "None" "X" "LEED Interpretation" "2467" "2009-03-24" "New Construction, Schools - New Construction, Commercial Interiors" "IEQc3.2: Construction IAQ Management Plan-Before Occupancy" "Overview: This CIR applies to Option 2- Air Quality Testing. With regards to the process to demonstrate that the maximum TVOC concentrations are below 500 micrograms/cubic meter, this CIR is requesting the acceptance of an alternate unit of measure based on a volumetric reading from an instantaneous, direct reading photoionization detector instrument (PID) using a 10.6 eVolt lamp. This reading would be recorded in a ppb (parts per billion) measurement and then converted to the designated unit of measure called out in the requirements (micrograms/cubic meter) using a conversion factor. This direct reading approach for TVOC will offer a more economical solution for IAQ testing by a factor of approximately two for our ~480,000 SF project. Methodology A conversion factor has been developed (by EH&E in Newton, MA) and is based on a TVOC ""fingerprint"" of 33 individual volatile organic compounds grouped by chemical category, resulting from a technical evaluation of the Building Assessment Survey Evaluation (BASE) data, the EPA TO-15 list of VOC\'s, and other relevant technical data. The EH&E team examined three lists of indoor VOC\'s to develop the TVOC ""fingerprint."" These lists originated the following sources: BASE dataset for commercial buildings, PID-readable chemical compounds, and an EPA approved list of indoor VOC\'s. Seven individual VOC\'s from the BASE data the had the highest reported concentrations and could be measured by a PID formed an initial, preliminary fingerprint. These individual VOC\'s were chemically regrouped (i.e. alcohols, halogenated hydrocarbon, aliphatics, etc.) and the relative group proportions in the fingerprint were compared with the BASE dataset. Based on the EPA guidance and a review of indoor VOC literature, additional VOC\'s not measured in the BASE dataset were considered for inclusion. By mapping additional pollutants from the EPA TO-15 list of VOC\'s, EH&E modified the fingerprint to represent new or existing buildings. The expanded list of compounds included all BASE compounds that were both on the EPA TO-15 list and measurable by the PID. This ""fingerprint"" is based on the following list of chemicals, sorted by their group, their average group molecular weight (AGMV), the % in BASE data, and specific compounds in fingerprint: Format given in following order: Group/AGMW/% in BASE/Compounds in Fingerprint Aldehydes/44.06/12%/Acetaldehyde Alkanes & alkenes/113.6/8%/n-undecane; n-decane; Nonane; Octane; n-hexane; 1,3 butadiene Aromatics/110.5/14%/d-limonene; a-pinene; Naphthalene; o-xylene; m- & p-xylenes; Ethylbenzene; Styrene; Toluene; Benzene Halogenated Hydrocarbons/130/15%/1,2 -dbromoethane; 1,2, 4-trichlorobenzene; 1, 2, -dichlorobenzene; Trichlorobenzene; 1,3,5 -trimethylbenzene; Chlorobenzene; 1,1 -dichloroethene; Vinyl chloride Alcohols/78.5/31%/2 -butoxyethanol; Phenol; 1 -butanol Ketones/58.1/15%/Acetone Other(e.g. acetates,sulfides, ethers, etc.)/92.55/5%/Butyl acetate; Dimethyl disulfide; Ethyl acetate; Carbon disulfide; t-butyl methyl ether Conversion Factor In order to convert a PID reading from part per billion (ppb) to a mass-based equivalent in micrograms/cubic meter, the PID value is multiplied by a derived conversion factor, MCF, defined below as the product of two correction factors, CF-1 and CF-2. For the TVOC fingerprint listed above, the formula is MCF = CF1 * CF2, where MCF = 2.70 Mass Conversion Factor CF1 = 0.88 Correction for predicted ppb PID reading to ""actual"" ppb reading, based on isobutylene equivalents, and CF2 = 3.07 Correction for ""actual"" ppb to micrograms/cubic meter equivalent, based on the chemical distribution of the mixture and the average molecular weight. Summary The acceptance of this CIR would provide a lower cost test for TVOCs, including the use of both hand held PID-TVOC direct read instruments and permanently installed PID-TVOC direct read instruments." "The applicant is requesting approval for use of a photoionization detector instrument (PID) to measure TVOC concentrations during air quality testing. The proposed alternative for testing of TVOC using a PID is not an approved method in the United States Environmental Protection Agency Compendium of Methods for the Determination of Air Pollutants in Indoor Air which are the methods required for this credit. The IAQ testing must be conducted according to the test procedure outlined in the referenced standard using an approved indoor TVOC measurement device, which is either Method IP-1A, Stainless Steel Canister, or IP-1B, Solid Adsorbent Tubes. Both of these methods utilize GC/MS analyses to determine the concentrations of the collected VOC\'s. Most laboratories will calculate the total concentration of VOC\'s (TVOC) according to a toluene equivalent mass from the Total Ion Chromatogram (not just the peaks of EPA TO-15 compounds, but the integrated area of the peaks from all compounds). This method is discussed in the California Department of Health Services (CDHS) Standard Practice. http://www.ciwmb.ca.gov/greenbuilding/Specs/Section01350 First of all PID analyses miss many of the common indoor VOC\'s such as aldehydes and aliphatics and has a poor response factor (i.e. and thus large uncertainty) for common indoor VOC\'s such as alcohols. The ""fingerprint"" method proposed for calibration of the PID is fundamentally flawed in that it uses a calibration based upon an assumed fixed percentage of mass of VOC\'s from seven different groups of VOC\'s while the actual mass percentage of VOC\'s can vary widely from building to building. The errors associated with the ""fingerprint"" method could be easily demonstrated by simultaneously measuring the TVOC concentration with a PID and either method IP-1A or IP-1B in a number of buildings. Such a comparison was conspicuously missing from the EH&E report ""Development of a Method to Convert Total Volatile Organic Compound Measurements in Buildings to Equivalent Mass Based Units"", although the report did contain numerous caveats regarding the accuracy of the ""fingerprint method"" including limitations related to the ""Representativeness of TVOC List"" and the ""Variability by Building Type"". Additionally, the LEED-NC v2.2 Reference Guide states that samples must be collected over a minimum 4-hour period; instantaneous TVOC measurements do not satisfy this requirement." "None" "None" "LEED Interpretation" "3701" "2007-02-12" "New Construction, Schools - New Construction, Commercial Interiors, Existing Buildings" "IEQc3.2: Construction IAQ Management Plan-Before Occupancy" "The project is a 15,000sf fire station in Texas.\nTo protect the building\'s HVAC system, we will be flushing out the building using a temporary heating unit using 100% outside air. We will use the equivalent performance methodology of providing 14,000ft3/ft2 and ending the flush out on the 14th day after construction, while maintaing 60 degrees. This unit will not be tied to the building\'s ductwork.\nThe construction schedule for the project requires that the building be occupied in stages.\nWe are proposing the following plan\n1. Flush out the first half of the living quarters portion by dividing the building with doors and by providing a temporary air-tight enclosure in a corridor. All vents and return air grilles will be sealed to avoid any cross contamination.\n\n2. Flush out the second half of the living quarters portion by the process outlined above.\n\n3. We are not planning to flush out the apparatus bay and the supporting rooms. These rooms do not have doors and open directly onto the bay. The bay does have unit heaters mounted high above the floor that serve to protect the equipment from extreme cold and to prevent the piping from freezing. The supporting rooms do not have any heaters or HVAC equipment. Our understanding is that flush out would not be necessary because of the nature of these spaces and because they are not served by a HVAC system. It would not be possible to flush them out using the standard LEED methodology of using the installed HVAC systems. Further, the bay usually has at least one 14x14 door open when the fire suppression personal are in there.\nOur request for interpretation is if this plan is acceptable." "This CIR appears to be in two parts. 1) Can the project, using the equivalent performance methodology, be flushed out in phases? 2) Can the apparatus bay and supporting rooms be excluded from the requirement for flush out?\nIn response to the first part, previously posted NC v2.0/2.1 CIR rulings, dated 10/17/2001, 9/5/2006 and 10/23/06, approve the process for a staggered flush-out approach, provided that existing spaces are protected from construction-related contamination as well as prevention of cross-contamination between systems. Protection measures should follow the SMACNA Guidelines for Occupied Buildings and be outlined in the Construction IAQ Management Plan to ensure compliance.\n\nAlso, the use of temporary ventilation units to accomplish the flush-out using the 14,000 ft3 / ft2 alternate approach described in the NC v2.0/2.1, 10/4/2004 credit ruling is acceptable, assuming the temporary units are capable of meeting the temperature and humidity targets.\nIn response to the second part, the apparatus bay and supporting rooms are considered part of the entire submitted project and therefore must be considered part of the square footage calculated for this credit.\n\nThe intent of this credit is to eliminate indoor air quality problems that occur as a result of construction. The use of outside air for flushout of the building is intended to reduce contaminants that are the result of the construction process.\n\nIn order to achieve EQ credit 3.2, all ""Occupied spaces"" as defined in ASHRAE 62.1-2004 must either:\n(1) demonstrate that natural flush-out through the use of the 14X14 operable door, and/or temporary HVAC units, provides an equivalent of supplying a total air volume of 14,000 ft3 of outdoor air per ft2 of floor area while maintaining an internal temperature of at least 60" "None" "None" "X" "LEED Interpretation" "5018" "2006-07-07" "New Construction, Schools - New Construction, Commercial Interiors, Core and Shell" "IEQc3.2: Construction IAQ Management Plan-Before Occupancy" "We would like clarification with regard to the furniture and furnishings that need to be installed before our baseline IAQ testing. We are planning to re-use a great deal of existing furniture that is currently in use by employees who will be relocating into the new CI space. Our understanding is that IAQ testing must be performed with all furnishings in place, prior to occupancy by employees. However, in order to minimize business interruption, we are conducting weekend moves of employees and their existing furniture, and the logistics of moving employees\' existing furniture and the associated set-up over a weekend does not provide sufficient time to perform the IAQ testing prescribed by the reference guide. As the relocated furniture has been in use for more than 10 years, we are not clear on the requirement to include re-used furniture in the IAQ test environment. Please clarify whether we can achieve EQ 3.2 by performing the baseline IAQ testing with only the new furniture and furnishings installed." "Yes, the baseline IAQ testing may be performed with only the new furniture and furnishings installed in the tenant space. The 10-year old furniture does not need to be relocated within the tenant space prior to either the IAQ testing or flush-out procedures. Provided that it is cleaned first, any furniture that has been installed for at least two years may be brought into the space following testing or flush-out. Applicable Internationally. " "None" "None" "X" "LEED Interpretation" "5028" "2007-01-05" "New Construction, Schools - New Construction, Core and Shell" "IEQc3.2: Construction IAQ Management Plan-Before Occupancy" "Our project is a new multi-family residential building that will be occupied in phases. We intend to conduct baseline IAQ testing, as outlined in option 2. Once a constructed portion of the building is tested and ready for occupancy, those spaces will be protected as discussed in the SMACNA Guidelines for Occupied Buildings and will be outlined in the Construction IAQ Management Plan. Prior to the occupancy of any unit, we will also pressurize the corridors to prevent IAQ contamination from traveling between units or entering from either the stairwell or elevator shafts. For the common areas, sampling points will be determined in accordance with Requirement #3. We intend to provide one sampling point in the lobby, one in the main gathering rooms on the first floor, and one on each corridor floor; as all of these spaces are smaller than 25,000 sq ft. We would like clarification in determining the number of sampling points for the residential units. Requirement #3 states that a separate sampling point is required for each ventilation system. The residential units are naturally ventilated, but each unit has a separate air handling unit. We would like to propose two alternative compliance paths for residential projects: 1. We will provide one sample point per 7 units, consistent with the progressive sampling methodology discussed under EQp2, option 3. 2. We will provide one sample point for each unit type. This methodology is based on credit ruling LEED-NC v2.1 dated 3/31/2003. Similar unit types will have similar selection and quantities of construction materials. Therefore one test per unit type will represent the IAQ of all similar unit types. Please confirm which alternative compliance path meets the credit intent. If neither is acceptable, please clarify how the IAQ testing option may be applied to residential projects." "The described approach for protecting the common areas and units from potential cross-contamination of indoor pollutants is reasonable, as well as the sampling point method for testing the indoor air quality of the common spaces. In the residential units, progressive testing consistent with the methodology of EQp2 is appropriate. This requires that one sample point be provided per each group of seven units in initial testing. If a failure is encountered during sample testing, re-sampling shall be conducted to assess whether that failure is unique or the rest of the units are likely to have similar failings. One of the up to six untested units in the group shall be selected for re-sampling. If testing in units in the re-sample confirms that the requirements are met, then the dwelling unit with the failure shall not be considered an indication of failure in the other dwelling units in the group. Corrective action shall be taken for the unit with the failure, and that unit shall be re-tested. However, if field testing in the re-sample results in a second failure, then all units in the group must be tested for compliance." "None" "None" "LEED Interpretation" "5100" "2008-01-18" "New Construction, Schools - New Construction, Commercial Interiors" "IEQc3.2: Construction IAQ Management Plan-Before Occupancy" "This CIR is in reference to a 55,000 sf healthplex project in a colder climate. The project includes a wellness center, occupational therapy offices, as well as rehabiltation offices and a pool area. The project team opted to attempt Option 1 of EQ 3.2 Construction IAQ Management Plan. After 3 1/2 days of 100% outside air, the team had reached the 3,500 cu.ft. of outdoor space per sq. ft. of floor area. However, the weather in our region turned colder and precluded the mechanical contractor from continuing with the flush-out plan. The RTUs on the project need to run at approximately 40% to achieve the rest of the flush out, but anything higher than approximately 20% could potentially hurt the units if they had to keep indoor air above 60 degrees and 60% humidiity. The RTUs are currently running at their set point of 20% and flushing out the building slowly, though not achieving the .3 cfm. This is our CIR request: The colder weather in this region creates a great obstacle for achieving the .3 cfm during the winter months. The team can\'t feasibly, based on the weather, achieve the .3 cfm requirement currently without harming the building systems and occupants. Have we met the intent of the credit by achieving the phase 1 of option 1 and calculating the flush-out based on the current rates until the 14,000 cu.ft. is achieved, or, do we need to wait until a later date (after occupancy) to resume the flush-out to the rates specified by the LEED Reference Guide once the weather is warmer? The project team requests that an alternative compliance be granted based on the extenuating circumstances." "This credit requires that an IAQ Management Plan be developed and implented. Based on your description, you planned to comply with Option 1A (flush-out before occupancy), but failed to implement that plan. You are asking if you can instead be allowed to ""comply"" with Option 1B (flush-out during occupancy), even though this option was not part of your plan, and even though equipment limitations prevent you from meeting the Option 1B requirement for 0.3 cfm/ft3 outdoor airflow rate. Your project does not comply with either Option 1A or Option 1B, so it does not qualify for this credit. Applicable Internationally. " "None" "None" "X" "LEED Interpretation" "5209" "2009-04-21" "New Construction, Schools - New Construction, Commercial Interiors, Retail - New Construction, Retail - Commercial Interiors, Healthcare" "IEQc3.2: Construction IAQ Management Plan-Before Occupancy" "We are requesting clarification on the number and location of IAQ testing measurements for a 140,000 SF university residence hall project. Based on guidance from previous CIRs for other buildings with large numbers of like spaces, we propose the IAQ testing approach described below: Corridors: The corridors are uninterrupted on each floor and are served by seven 100% outside-air Roof Top Units spaced along the building. Each RTU serves the corridor segments of the floors beneath it. (RTU 1 serves the West section of the corridors on floors 1-5, etc.) The corridors on each floor are identical in terms of materials, finish, usage and, for the most part, configuration. We propose to sample one location for each corridor RTU, with at least one test per floor. Any unique configurations will also be tested. (7 tests) Nonresidential spaces: Two additional RTUs serve several first floor common spaces: RTU 8 serves a large conference room; RTU 9 serves several other common spaces (e.g. building lobby and reception areas). Each RTU serves less than 25,000 SF. There are 18 additional spaces - lounges and private offices - which rely primarily on individual PTACs and operable windows for outdoor air. Many of these spaces are identical (e.g. Five identical lounges, one on each floor). For the first floor spaces served by RTUs, we propose to test 1 location per RTU in keeping with the credit requirements. For the remaining 18 spaces which rely primarily on PTACs and operable windows for outdoor air, we propose to test each unique space. For the identical spaces, we propose to test 1 in 7 of each type. (11 tests total) Residential: The majority of the building comprises 144 residential units, all of which are identical in terms of finish, materials and usage. There are 15 different unit types total. Five of the unit types are single occupancy apartments, accounting for 12 units; with no more than 5 of each apartment type. The 10 remaining unit types are dorm suites, accounting for 132 units. Each type of dorm suite is a different configuration of the same elements: a common living/kitchen space, a bathroom, and single or double bedrooms. (Unit type 4A has a living/kitchen area, a bathroom and 4 single bedrooms; unit type 4B has a living/kitchen area, bathroom, and 2 double bedrooms; etc.) Each bedroom and living/kitchen space has a dedicated PTAC, and relies primarily on the PTAC and operable windows for outdoor air. For the 12 single occupancy apartment units (representing 5 unit types), we propose to test one of each unit type. For the 132 dorm suites (representing 10 unit types), we propose to test at least 3 examples of each identical space that composes the suites. That is, we will test 3 single bedrooms, 3 double bedrooms, 3 living/kitchen areas and 3 bathrooms at minimum. These tests will be selected such that there is at least one test in each unit type and at least one test per floor. (17 tests total) All test locations will be selected according to the guidance provided in the reference guide (3-6 ft from floor, in the location anticipated to have the least ventilation and highest presumed source strength, etc.). We feel that providing 35 tests is more than adequate for a 140,000 SF building. Please indicate whether this approach will meet the credit intent or provide additional guidance if it will not." "The applicant is requesting clarification to confirm if the proposed sampling locations are acceptable for each space type given the specific project information provided. It should be noted that although a random sampling plan may be employed per CIR Ruling dated 5/30/2007, contiguous areas served by multiple RTU units, such as the corridors, are considered separate ventilation zones. The proposed sampling locations, by space type, are considered as follows: Corridors: Each of the 5 contiguous corridors is served by 7 separate RTU units for a total of 35 similar ventilation zones. The sampling strategy of insuring that each RTU and each floor will be represented, along with any unique configuration areas, is consistent with the allowable random sampling strategy and does not exceed 7 locations per sample. Therefore 7 sampling locations are acceptable for the corridor areas. Non-Residential: For the first floor RTU unit 8, serving a single space with an area less than 25,000 sq.ft., a single sampling location is acceptable. For the first floor RTU unit 9, serving multiple spaces with a combined area less than 25,000 sq.ft., a single sampling location is acceptable provided the areas represent a single ventilation zone. If the areas served by RTU unit 9 are not a single ventilation zone, each area must be sampled individually. It should be noted that if 2 or more of the areas served by RTU unit 9 are identical, a sampling strategy may be employed provided that no greater than 7 identical locations are represented by a single sample. For the remaining 18 spaces, the proposed sampling strategy is acceptable as each unique space is sampled and no greater than 7 identical locations are represented by a single sample. Residential: For the 12 single occupancy apartment units, it is acceptable to employ a sampling strategy of one sample per unit type, as no greater than 7 identical units will be represented by a single sample. For the 132 dorm suites, it is not clear from the description that no greater than 7 identical units will be represented by a single sample and it does not appear that a minimum of 3 samples will be taken for each identical configuration. Therefore, this strategy is only acceptable if no greater than 7 identical units are represented by a single sample or if a minimum of 3 samples are taken for each identical unit type. It should be noted that although 3 samples are proposed for each component part of these units, the mixing of air may be variable depending on the specific configuration of spaces within the unit. Therefore, each of the 10 unit type configurations must be considered individually when determining sampling strategies." "10222" "None" "LEED Interpretation" "5217" "2009-06-04" "New Construction, Commercial Interiors, Schools - New Construction" "IEQc3.2: Construction IAQ Management Plan-Before Occupancy" "The total area 79,650 SF of the new building is divided as indicated below. 20,940 SF - Data Center with raised floor 13,200 SF - office space, loading, storage and support areas 45, 510 SF - MEP spaces --79,650 SF The data center (20,940 SF) and MEP spaces (45,510 SF) are designed with minimal outside air, which is not occupied by the office staff. The question is: would Performing a flush-out only in office spaces (20,940 SF), excluding the Data Center and MEP spaces shall meet LEED NC 2.2 Credit 3.2 requirements under flush out option? This question is being asked on the basis that only office spaces are truly occupied by the personnel, and data center and MEP spaces are not." "The applicant is asking if the flush out procedure needs to be performed in unoccupied areas within the building in order to comply with the credit requirements. All spaces that are “occupiable,” as defined by ASHRAE 62.1, must be flushed out. ASHRAE’s definition is “an enclosed space intended for human activities, excluding those spaces intended primarily for other purposes, such as storage rooms and equipment rooms, that are only occupied occasionally and for short periods of time.” Typical MEP spaces would not be considered to be occupiable. However, data centers would be considered occupiable since personnel are present more than “occasionally and for short periods of time. **Update October 1, 2013: Applicable credits have been updated." "None" "None" "X" "LEED Interpretation" "695" "2004-01-21" "New Construction, Existing Buildings, Commercial Interiors, Core and Shell, Schools - New Construction" "IEQc3.2: Construction IAQ Management Plan-Before Occupancy" "This request is an appeal to a CIR submitted for Hillsboro Civic Center. We are requesting the use of dynamic air cleaners, utilizing ultra-violet germicidal irradiation (UVGI), as equivalent to MERV 13 static filtration media. 1.) The basis for rejection seems to rest solely on the fact that LEED references ASHRAE 52.2. Indeed, the ruling states that ""USGBC would prefer to allow the use of effective dynamic filters for compliance."" It can be proven that the proposed method filters particles to the level of MERV 13 and, therefore, meets the criteria of the standard. 2.) The International Mechanical Code allows the implementation of alternative materials and methods (Section 105.2) for equivalent compliance to those prescribed in its code. The IMC has this provision because it recognizes that technology changes more quickly than building codes. If a technology can be shown to be consistent with the intent of a standard and equivalent in performance, it is allowed. 3.) MERV 8 and 13 are cited as minimum levels of performance in EQ Credit 3. The purpose seems clearly to provide a minimum standard of air quality in buildings, not to promote the use of static filters. If a technology can be shown to produce equal or superior levels of air quality, there is no sound basis for rejection. 4.) In disallowing the request, it was cited that approval would require a substantial change to the credit as currently written and that the CIR process was not the appropriate forum for facilitating such a change. The project team is not asking for a change to the credit, only recognition that dynamic filtration exceeds the standard of compliance. 5.) The project team initially requested that this technology be granted a point for Innovation and Design. That request was denied on the basis that the system did not represent superior or exemplary performance (see CIR dated 7/10/03). If this innovation does not represent superior or exemplary performance to a standard LEED credit, then it is implied that it does, in fact, meet the standard credit. Since EQ Credits 3.1 and 3.2 are the only ones that address filtration of HVAC equipment, at a minimum, a superior filtration method to the ones cited in the reference standard should be granted equivalent status. Research studies have proven the effectiveness of UVGI. Penn State University's Department of Aerobiological Engineering performed one such research study. Many other health organizations including the Centers for Disease Control, and The Lancet medical journal support these findings. http://www.arche.psu.edu/iec/abe/wjkuvgi.html http://www.phppo.cdc.gov/cdcrecommends/showarticle.asp?a_artid=M0035909&TopNum=50&CallPg=Adv http://www.thelancet.com/ (search for ôUVGIö) http://www.katu.com/health/story.asp?ID=62778 Dynamic air cleaners and other active filtration technologies, are entirely consistent with the overall goals of USGBC and LEED to ""produce a new generation of buildings that deliver high performance inside and out"" and ""that are environmentally responsible, profitable and healthy places to live and work."" In fact, because dynamic air cleaners consume less energy and the glass-fiber media can be recycled, they would seem to be more in line with these goals than MERV 13 passive filters. Due to its superiority, this technology is being considered by the Department of Defense and Department of Homeland Security for use in critical facilities to combat bio-terrorism. In light all this evidence, we ask the committee to reconsider its previous decision and allow the use of the proposed filtration method to satisfy the criteria of LEED EQ Credits 3.1 and 3.2." "The project is appealing a 10/17/03 IEQ Credit 3.1 CIR and requests approval to use an alternative filtration method for installation after construction and prior to occupancy. The CIR was submitted under EQ Credit 3.2, but this ruling applies to both 3.1 and 3.2. The project has raised a number of strong arguments in making their case for the use of dynamic filters. However, there are some overriding concerns that lead the USGBC to remain cautious about this issue. To date, there are no studies that we are aware of that clearly equate the performance of electronic filters with those of passive filters. The requirements for these credits are based on the requirements of ASHRAE 52.2-1999, which define the Minimum Efficiency Reporting Value (MERV) of 13, as ""the ability of the device to remove particles from the airstream and its resistance to air flow."" The standard specifically states that the testing methods cannot be used to test electronic air filters. This issue is of concern because while the removal efficiency of a MERV 13 filter increases with use, research indicates that an electronic air cleaner\'s performance deteriorates rapidly, and it is therefore difficult to equate performance over time. In addition, the performance of the electronic filters depends greatly on frequent and thorough cleaning, which was not addressed in the CIR. As mentioned in the original ruling, the ASHRAE 52 sub-committee is in the process of reviewing testing methods for electronic filters, and is likely to issue an addendum to ASHRAE 52.2 in the near future. Once ASHRAE established an equivalency (hopefully before your project is submitted for LEED certification review), the USGBC will adjust its criteria accordingly. Until that time, MERV 13 filters will be required for both EQc3.1 and 3.2. -- *NOTE (Nov 1 2007): Per EQc3.1 errata posted in Fall 2007, there is no LEED or ASHRAE 52.2-1999 requirement for MERV 13 filtration during construction. LEED-NCv2.1 EQc3.1 requires MERV 8 filters on return air grills during construction, and for all filtration media to be replaced with MERV 13 immediately prior to occupancy/at the end of construction. LEED-NCv2.1 EQc3.2 (option one) requires MERV 13 filtration media at 100% outside air during flush out. Applicable Internationally." "None" "None" "X"