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" "10098" "2011-08-01" "New Construction, Core and Shell, Schools - New Construction, Retail - New Construction, Healthcare, Data centers - New Construction, Hospitality - New Construction, Commercial Interiors, Retail - Commercial Interiors, Existing Buildings, Schools - Existing Buildings, Retail - Existing Buildings" "IEQc5: Indoor Chemical and Pollutant Source Control" "Where there are physical impediments to locating 10 ft of walk-off mats inside the building, is it acceptable to locate a portion of the mat or grate outside and then the remainder of the required 10 ft inside?" "The intent for the entryway system (grilles, grates, walk-off mats) is to capture dirt and dust. An exception to the 10 ft length and/or indoor location is acceptable provided your alternative solution meets this intent and is thoroughly justified. Applicable Internationally." "5585, 5696" "None" "X" "LEED Interpretation" "10252" "2012-10-01" "New Construction, Core and Shell, Schools - New Construction, Retail - New Construction, Healthcare, Commercial Interiors, Retail - Commercial Interiors, Existing Buildings" "IEQc5: Indoor Chemical and Pollutant Source Control" "Carpet tile is not currently considered an acceptable entryway system. One reason carpet tile is not accepted is because it cannot be cleaned underneath and therefore does not meet the performance of mechanical systems (such as grates/grilles), or roll-out mats. Carpet tile is a highly desired material for walk off areas due to its ease of maintenance as compared to mechanical systems, avoidance of trip hazards associated with roll-out mats, and numerous other factors. The ability to clean underneath carpet tile is not necessary. Carpet tile creates a sealed floor where dirt and moisture do not penetrate the seams. Though not specifically required by the rating system, the reference guide provides suggestions for optimal performance attributes for entryway systems. The carpet tile product we are suggesting meets the performance-related attributes as follows: \nCapture particles & prevent interior contamination- the carpet tile product is specifically designed to withstand heavy traffic at entranceways. Captures and hides soil, requires minimal maintenance and helps prevent slips and falls. Extend 10 feet: the carpet tile will extend 15\' into the interior from the exterior entrance and 40\' in left-right directions along the building lobby. Solid backings & appropriate for climate- the carpet tile backing is stable even under extreme changes in temperature and humidity. It will not move, create gaps, or curl up over time. High-void-volume & high fiber height- the carpet tile is produced with needlepunch hair-like face fibers with pile height of 0.165 in. Electrostatic propensity- the electrostatic propensity level is less than 2.5 kV. Weekly cleaning - the walk-off system will be maintained by the in-house school maintenance staff. The tiles are vacuumed daily and spot cleaned with appropriate environmentally-preferable cleaning products as needed. If an individual tile is deemed to be damaged beyond repair, it is simply removed and immediately replaced with a new identical tile. \n \nHow can we demonstrate that carpet tile is an equally performing or better solution for entryway systems?" "The applicant is requesting confirmation that carpet tiles may be used as acceptable entryway systems. Yes, carpet tiles with similar attributes to the product described are acceptable entryway systems.Conventional carpet is not acceptable, the carpet tile must be specifically designed for entryway system or similar use, have performance attributes equivalent to other acceptable entryway systems, and must be regularly maintained. Applicable Internationally. \n\n***Updated 01/012013 to add applicability for LEED 2009 for Healthcare and to remove the text ""(such as high pile height)""." "None" "None" "X" "LEED Interpretation" "2155" "2008-07-02" "New Construction, Existing Buildings, Commercial Interiors, Core and Shell, Schools - New Construction" "IEQc5: Indoor Chemical and Pollutant Source Control" "This proposal requests confirmation and approval of an alternate walk-off mat compliance method. We request 1) confirmation if an access point into a hotel accommodation serving 12 people or less constitutes a ""high traffic exterior access point,"" would require a walk-off mat; and, 2) if walk-off mats are required in the ""low traffic access areas,"" we request approval of walk-off mats that are less than 6 feet long in the direction of travel due to the constraint of existing historic building porch depths and building footprints. The project is complying with the all three requirements under this credit: all areas where hazardous chemicals may be present are being exhausted at a rate of at least 0.50 cfm/SF and all of the rooms have hard lid ceilings; MERV 13 filters are installed on all mechanically ventilated systems; and, walk-off mats are being employed in all primary entryways to all regularly occupied buildings. The project is a multiple buildings submission and includes rehabilitation of 21 historic buildings being adaptively reused as a hotel and conference center, and construction of 14 new buildings on existing non-historic building footprints. Four of the 21 historic buildings and one of the new buildings are major publicly used buildings used for lobby/registration, offices, conference rooms, a commercial kitchen, a bar/restaurant, banquet facilities, and day spa facilities. The main entrance of each historic building is located at the building\'s front porch. These porches are deep enough to accommodate 6\' long walk-off mats and will employ a 6\' long mat. These are considered ""high traffic areas."" Thirteen of the 21 historic buildings that were originally officer\'s housing are being converted to guest lodging. The main entrance of each building is located at the building\'s front porch. The porches are less than 6\'-0"" deep and can accommodate a mat that is 3\'-6"" to 4\'-0"" deep without creating a trip hazard. Some lodging buildings have 1 to 2 units (so a total occupant load of 2 to 4 people), and others will accommodate between 8 and 12 occupants from a single point of entry. Thirteen of the 14 new buildings were constructed to accommodate additional lodging units. The project\'s Environmental Impact Statement limited new construction footprints to the existing footprint of the demolished non-historic housing. Each lodging unit has a separate entry and will accommodate between 1-4 people. At new lodging, the constraints of reusing pre-existing building footprints/pads limited unit entries to approx 4\' deep and as such, the LEED walk-off mat length requirements at new lodging entries can not be achieved. All mats sitewide will be maintained on a daily basis. This is an exemplary practice that goes beyond the weekly maintenance requirement of LEED. As the intent of this credit is to reduce the amount of contaminant from being tracked into the space, the use pattern of stopping to open the door with the room key is a practice that presumably removes much more contaminant than merely walking over a mat in an office setting, thus daily maintenance of a slightly shorter mat may likely be more effective than weekly maintenance of a 6\' mat. This credit requires walk-off mats at ""high traffic exterior access points"". Please confirm if an access point into a hotel accommodation serving 12 people or less constitutes a ""high traffic exterior access point"" and requires a walk-off mat. And if they are required, we request approval of the use of walk-off mats that are less than 6 feet long in the direction of travel due to the constraint of existing historic building porch depths and building footprints." "The applicant is enquiring 1) whether an access point into a hotel accommodation serving 12 people or less is considered a ""high traffic exterior access point”. This issue has been addressed in numerous LEED-NC v2.1 CIRs. Please see CIR ruling 4/4/2005 & 12/21/2004 which state that, “In evaluating the requirements of this credit, you should focus on the frequency of use of each building entry point rather than the percentage of building occupants served. Hence, any door that is intended to be used regularly and frequently by building occupants should be considered high volume for the purposes of this credit."" Therefore, the access point into a hotel accommodation as described by the applicant would require walk of mats. The applicant is further enquiring 2) If walk off mats are required in their case, then due to the historic nature of the project, they be allowed to use walk off mats shorter than 6 feet in the primary direction of travel which would be maintained daily. As noted in 1) walk of mats would be required at the access points of the lodging units. However, due to historic constraints and the residential nature of the lodging units, the use of walk of mats which are 4 feet deep in this particular case does meet the intent of the credit. Applicable Internationally. " "None" "None" "X" "LEED Interpretation" "2221" "2008-07-02" "New Construction, Existing Buildings, Commercial Interiors, Core and Shell, Schools - New Construction" "IEQc5: Indoor Chemical and Pollutant Source Control" "Our high rise residential project currently has: Grates 3\'-0"" wide in the direction of travel outside of the ground floor entrances Structured parking with a dedicated (not combined with return air) exhaust system. Maintenance room to house chemicals with walls to deck, closers on both leaves of a pair of doors, as well as a dedicated (not combined with return air) exhaust system exhausting into the structured parking. Pool equipment room to house chemicals with walls to concrete mechanical platform above to access exhaust fans for the structured parking, and closers on both leaves of a pair of doors. MERV 13 filter to be installed prior to occupancy on HVAC units serving regularly occupied spaces. The following are additions/modification or questions regarding EQc5 requirements: 3\'-0"" wide in the direction of travel roll-out mats (2 year min maintenance by contracted service organization) are to be placed inside the building at the areas of the 3\'-0"" wide in the direction of travel grates at the ground floor entrances for a 6\'-0"" total permanent entryway system. Or is a 6\'-0"" wide in the direction of travel mat inside required? Roll-out mats (2 year min maintenance by contracted service organization) to be placed at all doors from structured parking to elevator lobbies, and from the pool deck to the elevator lobby. 6\'-0"" wide in the direction of travel mat will be installed where the 6\'-0"" does not encroach on vehicle circulation. A 3\'-0"" wide in the direction of travel mat will be installed outside and inside the elevator lobby where vehicle circulation is within the 6\'-0"". Or is a 6\'-0"" wide in the direction of travel mat inside the elevator lobby a better solution? The custodian must pass through the maintenance room to access the custodian office and custodian toilet room. Do the doors to the custodian office and toilet room require closers? The pool equipment room with have a dedicated (not combined with return air) exhaust system exhausting into the structured parking will be installed in it. Will the project as designed along with the proposed additions/modification meet the requirements of EQc5?" "Can a 3\'0 (in the direction of travel) grate or mat on the outside of all regularly used entry points be combined with a 3\'0 (in the direction of travel) walk-off mat on the interior to meet the required 6\'0 minimum entryway system? Yes, grates and walk-off mats combined are likely to provide superior dirt entrapment than a walk-off mat alone. Please bear in mind that 6\'0 in the direction of travel is the minimum length to meet credit requirements. Many commercial buildings may combine a grate with two different coarsenesses of mats for 30 feet or more to minimize exposure to potentially hazardous particulates. All entryway systems must meet LEED requirements as detailed in the Reference Guide and applicable CIRs. Are rooms adjoining a chemical use/storage area required to have closers on them? Yes, the intent of this credit is to, ""Minimize exposure of building occupants to potentially hazardous particulates and chemical pollutants,"" as such a chemical use/storage area must be isolated to protect the occupant/s of the custodian\'s office and toilet from the adjacent storage area. It is not clear from the provided description as to whether exhausting the pool equipment room into the structured parking may pose a health hazard, particularly in the event of a chemical spill." "None" "None" "LEED Interpretation" "2223" "2008-08-13" "New Construction, Existing Buildings, Commercial Interiors, Core and Shell, Schools - New Construction" "IEQc5: Indoor Chemical and Pollutant Source Control" "Chilled Beams & Re-circulated Air The project is a 6-story new consolidated forensic laboratory facility of approximately 351,000 square feet with approximately 140,000 square feet of laboratory space and the remainder typical office space. The office space and much of the lab spaces in the building will be tempered by active chilled beams. The remainder of the lab spaces with heavy equipment loads or special requirements will be served with fan coil units that will all be equipped with MERV 13 filters. Active chilled beams are located in or directly above the conditioned spaces. They utilize ventilation air that flows through the beam. The ventilation air passes through small air nozzles which induces room air through the cooling coil in the beam and provides overhead ventilation and sensible only cooling. This technology reduces energy and the architectural impact of ductwork and mechanical systems. Finally this cooler air will fall to the floor. Once the air heats up, it will rise back to the beam to be cooled again through the natural process of convection. The ventilation air supplied to the space through the beams will be single-pass, 100% outside air and will pass through MERV 14 filters at the air handling units before passing through the chilled beams. However, the project team is concerned that the natural process of convection utilized by this system may conflict with earlier Credit Interpretation Rulings (02/12/08, 08/13/2007, 08/08/2007) that state re-circulated air inside a single space must pass through MERV 13 filters. The nature of the system prevents filtration within the beams. The project team would like clarification if air re-circulated by chilled beams is held to the same filtration standards as a forced air system if the ventilation air provided to the chilled beams is single-pass and has already passed through MERV 14 filters?" "The proposed HVAC system design mixes 100% outside air from an air handling unit equipped with a MERV 14 filter with re-circulated, un-filtered air from the conditioned space. This request has been addressed by previous CIRs dated 2/12/2008, 8/13/2007, and 8/8/2007. The LEED-NC v2.2 Reference Guide states that filtration using a MERV of 13 or better must be applied to process both return and outside air that is to be delivered as supply air. Therefore, the system as described does not meet the credit requirements. NOTE: UPDATED CREDIT LANGUAGE FOR 2009 STATES THAT ""PARTICLE FILTERS OF AIR CLEANING DEVICES SHALL BE PROVIDED TO CLEAN THE OUTDOOR AIR AT ANY LOCATION PRIOR TO ITS INTRODUCTION TO OCCUPIED SPACES"". REQUIREMENT FOR FILTRATION ON RETURN AIR IS NO LONGER APPLICABLE TO ANY VERSION OF ANY RATING SYSTEM. Applicable Internationally. " "None" "None" "X" "LEED Interpretation" "2366" "2008-10-08" "New Construction, Existing Buildings, Commercial Interiors, Core and Shell, Schools - New Construction" "IEQc5: Indoor Chemical and Pollutant Source Control" "Our project is a Graduate University located in Saudi Arabia dedicated to the research of alternative fuels and renewable energy. The entire campus will be New Construction and will consist of research labs, lab support areas, administration buildings, a library, a commons building, food service, an auditorium, conference rooms, lecture halls, offices and public areas. The project is seeking interpretation for the MERV 13 filtration media requirement in regularly occupied spaces. Some spaces will be utilizing Active Chilled Beams as an Energy Conservation Strategy. The Air Handling Units supplying the space with the active chilled beams contain MERV 13 or 14 filtration media. The Active Chilled Beams induce room air in these spaces and provide highly efficient cooling for the space. This active chilled beam induced room air is not filtered by MERV 13 media because MERV 13 media is not available for the active chilled beam apparatus. To reference a CIR ruling dated 8/13/07, ""Since the fan coil units re-circulate room air, they must have MERV 13 filters, which are available on the market."" The MERV 13 filters for the active chilled beams are not available on the market. The design team would like an exemption for this requirement because the MERV 13 filters for the active chilled beams are currently not available on the market. The design team feels that the implementation of energy saving active chilled beams, despite the lack of availability of MERV 13 filters, is imperative to help achieve the overall energy reduction goals of the project. The project design will meet both of the other requirements of this Credit and believes that the design should be exempt from the filtration requirements." "Based on LEED-NC v2.2 EQc5 CIR ruling dated 8/13/2008, the system as described does not meet the requirements of the credit. NOTE: UPDATED CREDIT LANGUAGE FOR 2009 STATES THAT ""PARTICLE FILTERS OF AIR CLEANING DEVICES SHALL BE PROVIDED TO CLEAN THE OUTDOOR AIR AT ANY LOCATION PRIOR TO ITS INTRODUCTION TO OCCUPIED SPACES"". REQUIREMENT FOR FILTRATION ON RETURN AIR IS NO LONGER APPLICABLE TO ANY VERSION OF ANY RATING SYSTEM. Applicable Internationally; Saudi Arabia. " "None" "None" "X" "LEED Interpretation" "2455" "2009-02-10" "New Construction, Existing Buildings, Commercial Interiors, Core and Shell, Schools - New Construction" "IEQc5: Indoor Chemical and Pollutant Source Control" "Background: Part of our project is a small pavilion building with a plan dimension of 45\' x 55.5\' that will function as a small cafeteria/ banquet space as a supplement to two adjacent high-rise towers. This pavilion space has a total 6 pairs of exterior swing doors and one revolving door. The revolving door will function as the main entry into the pavilion. Visitors will be encouraged to use the main entrance - the revolving door - to enter the pavilion. The revolving door is 6\'-0"" in diameter with a permanent walk-off installed within the diameter of the revolving door enclosure. Two of the six pairs of doors will also function as side entrances. Both of these pairs of doors will have 6\'-0"" walk-off mats inside the pavilion. The four remaining pairs of doors are intended for natural ventilation only. The arrangement of loose furniture will discourage the use of these doors as entrances. These remaining pairs of doors will not have walk-off mats. Credit Interpretation Request: It is the design team\'s interpretation that the walk-off mats are required only at the main entrance (the revolving door) and at the two side entrances. The arrangement of loose furniture will discourage the use of these remaining four pairs of exterior doors as entrances and therefore walk-off mats are not required at these doors. It is also the design team\'s interpretation that since the revolving door is 6\'-0"" in diameter, it would only be necessary to provide the walk-off mat within the diameter of revolving door enclosure. Please confirm that design team\'s interpretation is correct." "The applicants are inquiring as to 1) if the 4 remaining doors qualify as main entrances and are required to provide 6\' walk-off mats in the direction of travel, and 2) Since the revolving door is 6\'-0"" in diameter, is it acceptable to only provide the walk-off mat within the diameter of the revolving door enclosure. 1) Past CIR rulings on 7/2/2008 determine that ""you should focus on the frequency of use of each building entry point rather than the percentage of building occupants served."" If design measures are being taken to distinguish between a high-volume main entrance and create low-volume, secondary entrances for building users, then the low-volume entrances would not require walk-off mats. However, the design solution to create the secondary entrances must also demonstrate that the low-volume design will be permanent. 2) The LEED-CS reference guide states that the permanent entryway systems must be ""at least 6 feet long in the primary direction of travel"". As the direction of travel will not be a direct path, but will be based on the circumference of the door frame which will result a direction of travel over the entryway that is greater than 6\'-0, the revolving door meets the credit intent. Applicable Internationally. " "None" "None" "X" "LEED Interpretation" "2481" "2009-04-08" "New Construction, Existing Buildings, Commercial Interiors, Core and Shell, Schools - New Construction" "IEQc3.5/3.8: Green Cleaning - Entryway Systems/Indoor Chemical and Pollutant Source Control" "This project building is a Class A multi-tenant office building, 37 stories tall and is over 400,000 square feet. Building operations and systems are managed by a property management company. All public entrances to the project building have 5\' floor mats in place, and the entire lobby floor is installed with cobbled stone to achieve the exact intent of this credit. Furthermore, there is a 25\' long carpeted area directly in front of the elevators, which acts as a walk-off mat that further reduces fine particulates from entering the building. Finally, the project building is in San Francisco, where the climate is always mild (no snow, leaves, etc), and as a result does not have substantial environmental debris tracking into the building. The current entryway system (floor mats, cobble stone area and carpet) is cleaned on a daily basis using a vacuum that is compliant with EQ 3.7 Green Cleaning: Sustainable Cleaning Equipment. We propose that the project building is clearly addressing the intent of EQ 3.8, although it does not meet the exact requirements outlined in the Reference Guide (specifically that at least 10 feet of mats must be in place immediately inside all public entryways). Proposed submittals include photos, lobby floor plan and two narratives: (a) describing how the entry system meets the intent of the credit and (b) describing the maintenance and cleaning strategies for the entry system. The project team requests that the point be granted on the basis that the project building is effectively reducing the exposure of building occupants and maintenance personnel to potentially hazardous chemical, biological and particulate contaminants." "This credit can only be achieved through the use of 10\' entryway systems specifically designed to capture moisture, dirt, dust, pollen and other particles. Entryway systems consist of fibers and textures specifically design to scrape, wipe, and hold moisture and particles from footwear. It is not apparent or verifiable that cobblestone functions equivalently; conventional carpeting is never appropriate as part of a entryway systems because of the difficulty associated with extracting trapped particles through cleaning and moisture issues. Applicable Internationally.\n\nPlease see updated guidance for this LEED Interpretation under a LEED Interpretation Ruling 10098 posted date 8/01/2011. Projects registered on or after this date must use the new ruling." "None" "None" "X" "LEED Interpretation" "2529" "2009-03-10" "New Construction, Existing Buildings, Commercial Interiors, Core and Shell, Schools - New Construction" "IEQc5: Indoor Chemical and Pollutant Source Control" "Our inpatient hospital project seeks to satisfy the permanent entryway system requirement of this credit through the use of semi-permanent walk-off carpet tiles that are thoroughly cleaned by internal staff on a regular basis. The semi-permanent walk-off carpet tiles are comparable to the permanent grates, grills, slotted systems, and roll-out mats in their ability to capture dirt and particulates and prevent them from entering the building. The project\'s walk-off carpet tile utilizes needlepunch hair-like face fibers and has a pile height of .165 inches allowing this durable walk-off carpet tile to capture dirt and particulates. Our inpatient hospital project is acutely aware of the importance of creating environments that have exceptional indoor air quality. Owner experience and testimonials have indicated that the semi-permanent walk-off carpet tiles perform as well as - if not better than - the permanent systems, when cleaned on a regular basis. The project\'s inpatient hospital Environmental Services Plan requires maintenance staff to be educated on proper maintenance procedures and to participate in ongoing training to establish and maintain an environment that has a high level of infection control, to meet the requirements of the Joint Commission and other regulatory organizations. The proposed credit documentation is based on a June 2008 credit interpretation ruling that permits internal maintenance staff to clean the walk-off areas on a regular basis in lieu of a 2-year service contract with an outside organization. In addition to all other credit required documentation, the credit submittal will include: - A copy of the Environmental Services Plan indicating that the walk-off carpet tiles will be vacuumed on a daily basis, will be thoroughly cleaned on a weekly basis, and highly trafficked tiles will be replaced on an annual basis. - A signed acknowledgment from maintenance staff that they have read, understand, and will comply with the Environmental Services Plan. Compliance with the Environmental Services Plan will be included in job descriptions for maintenance staff for no less than two years. - A signed letter from the Owner stating their commitment to the Environmental Services Plan for no less than 2 years. - Product specifications for the walk-off carpet tiles. Our inpatient hospital project believes that providing walk-off areas at regularly used entrances and exits that utilize a flooring material that prevents dirt and particles from entering the building, as the semi-permanent walk-off carpet tile does, and being committed to cleaning these areas on a regular basis meets the intent of the first part of the credit. Of course, all other requirements for this credit will be met. Please advise if this will meet the intent, requirements, and documentation required to achieve this point." "The proposed use of semi-permanent walk-off carpet tiles that are maintained and replaced, as described would be an acceptable alternative system to the credit requirements of a permanently installed system or roll-out mats. Please provide the stated documentation for the LEED submission process." "None" "None"