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" "1348" "2006-01-24" "New Construction" "IEQc6.1: Controllability of Systems-Lighting" "As part of our project, there is a large greenhouse enclosure with a floor area reserved for smaller private classroom gatherings and demonstrations, and a larger area devoted to a plant exhibit for pubic viewing. Attached to, and accessible through, the greenhouse are ten small classrooms, each with a view into the greenhouse. These classrooms will be heated and cooled with conventional mechanical system. We have shown the wall between greenhouse and classrooms to be insulated and detailed as an exterior wall. The greenhouse walls will have many operable windows controlled by the greenhouse controls system. These controls will also operate a misting/fogging system, to maintain humidity levels for the plants, and fin tube heating and fans to control temperature in the greenhouse to about ten degrees above outside temperature in the summer and down to no less than fifty degrees in the winter. In calculating perimeter wall and window quantities for EQ6.1, which wall should we consider to be the perimeter wall to satisfy this credit - between greenhouse and classrooms, or at the perimeter of the greenhouse?" "Operable windows between the classroom and greenhouse space would not meet the intent of the credit to allow for ventilation control by individual occupants. Bringing greenhouse air into the classroom space is not adequate ventilation, unless the greenhouse and classrooms are designed with natural ventilation per section 5.1 of ASHRAE 62.1-2004. The application of Credits 6.1 & 6.2 to the classrooms should be guided by the \'Group Multi-occupant Space Calculations for Credits 6.1 and 6.2\' in the Reference Guide. For this calculation, perimeter wall should be considered that facing the outside, natural environment, not the greenhouse. Additionally, operable windows should be considered as those that open to outside. Additionally, the greenhouse is assumed to be process-dedicated in which lighting, temperature, and ventilation are controlled to meet the needs of the plants rather than the needs of occupants. If that is the case, Credits 6.1 and 6.2 would not apply to this space. The space seems to be occupied regularly by educational classes and other groups, but if there is good justification to consider this space as \'non-regularly occupied\' then the space would be exempt. Applicable Internationally. " "None" "None" "X" "LEED Interpretation" "1512" "2006-09-19" "New Construction, Schools - New Construction, Commercial Interiors, Core and Shell, Existing Buildings" "IEQc6.1: Controllability of Systems-Lighting" "The new Household Materials Collection and Training Center will serve the needs of many city residents with it\'s bi-parti building program. Located in a former animal incinerator facility, the structure incorporates a green vegetative screen and roof systems, a solar wall for heating the training facility, the maximization of natural daylighting through skylights and sensors, as well as the reuse of existing insulated metal panels removed from the building. The first or Southern half of the building will include a workforce Training Center to teach ex-offenders practical job skills. This half of the building regularly occupied spaces include a classroom, offices, and a training floor. For these spaces, operable windows and lighting controls servicing the perimeter areas of the rooms have been specified in attempts to meet or exceed the EQc6.1 and EQc8.1 requirements. The training room will utilize the group multi-occupant spaces definition as noted in CIR 0098-EQc6.1-120904 for LEED-NC v2.1 projects. In addition, existing skylights will be utilized to increase the natural daylight exposed to the interior of the building. The second or Northern half of the building includes the Household Materials Recycling Facility, which will give city residents a place to properly dispose of their household hazardous waste: paint, batteries, oil, pesticides, etc. In addition, cell phones, computers, etc. will be accepted for recycling. This portion of the project consists of three spaces - an outdoor yard for hazardous waste storage enclosures, as well as two indoors spaces - Collection/Process area and a materials storage Warehouse area. The Warehouse area, separated from the Collections area by a four hour fire wall, will be used mainly to store bundled materials prior to shipping and is not open to the public. The Collections/Processing area will be typically open to the public one day and two afternoons (equivalent of 2 full time days) a week. During the hours the Collections/Processing area will be open to the public, the two sets of double doors and two industrial garage doors will be opened to the exterior, signaling the facility\'s ""open"" status. These openings will allow access to the Collections/Processing area for the public to drop off of materials, as well as allowing employees to move materials around and out of the Collections/Processing area and to the exterior. The doors are to be open at all times of year in all weather conditions, when the facility is open and running. Due to the rough nature of the facility and the fire resistive requirements by building code for this hazardous portion of the building, windows are prohibited in the Collections/Processing area. Overhead lighting for this area will be controlled by wall mounted switches under a 200 sqft average coverage zone. Request: Interpretation of LEED 2.1 NC Credit IEQ 6.1 pertaining to ""regularly occupied space"" is requested here. Although an industrial (also possibly hazardous) building has been interpreted in CIR IEQc8.1-092403, should it be interpreted in a similar method for IEQc6.1 calculations? CIR 0098-EQc6.1-110901 does suggest some degree of interpretation for areas deemed regularly occupied, but it is not specific enough for our building type/use. We believe that in this case, the regular operation of large, overhead doors as a source for natural light and ventilation is an acceptable substitution for windows. However, our exact situation is presently beyond the scope of current definitions and interpretations. Please confirm if our situation will fulfill the requirements of this credit." "If documentation of official operations policy is provided stating the following, the Collections/Processing area may be excluded from the ""regularly occupied spaces"": 1. The Collections/Processing area will indeed be open to the public only for one day and two afternoons a week AND 2. None of the employees will be ""stationed"" in this space; apart from visits to move materials around and out of the Collections/Processing area." "None" "None" "LEED Interpretation" "1553" "2006-08-09" "New Construction" "IEQc6.1: Controllability of Systems-Lighting" "Our project is a building containing social service offices and residential units. In order to insure that we meet the intent of this credit we request the following clarifications: 1. One of the perimeter spaces in the project is a roughly 1,000-square-foot waiting area/lobby for a Food Bank. There are no full-time occupants in this space. The hours this space is occupied are: Tuesdays 10am to 11am Wednesdays 4pm to 7pm Thursdays 10am to 1pm During these hours there are approximately 30 families per hour who pass through the space to pick up food. At other times the space is not occupied. The current design has a number of fixed windows. Are we required to provide operable windows and lighting controls that meet the requirements for IEQ Credit 6.1 for this space (i.e. is this waiting area considered a regularly occupied space)? 2. One of the office spaces in the building is technically within 15-feet of the exterior, but there is a partially enclosed, concrete stair between the outside wall of the office and the exterior wall of the stair. We would argue that because of this, the space essentially does not share ""a physical connection with the building exterior."" Furthermore, placing a window in the small remaining portion (just above the stair treads beyond, and more than 6-feet high within the office) seems to go against the intent of this credit; that is, to ""promote the productivity, comfort and well-being of building occupants"" because of noise pollution from resident use, etc. Should this office instead be considered non-perimeter space? 3. One of the spaces in the office portion of the building is a thick, T-shape, with the upper portion of the ""T"" connecting to the exterior via door and windows on each side. The lower portion of the ""T"" is slightly thicker and, aside from the above, is not directly connected to the exterior (offices less than 15-feet wide, and possessing full-height walls, fill in the space on either side). Finally, this space has no full-time occupants, but serves as a waiting area for several offices when the need arises. Is this a ""regularly occupied space"" requiring adherence to the calculations of this credit? If so, should we separate the space into the upper- and lower-portions of the ""T,"" or strictly follow the 15-foot offset rule even though this means including portions of the space with no direct connection to the exterior?" "This request contains three questions related to the definition of regularly occupied and perimeter spaces. 1. With respect to the waiting room/lobby and the described functionality, it may be excluded from the regularly occupied spaces. 2. With respect to the office in question, it should be treated as non-perimeter space since it is separated from the perimeter by an interior wall. 3. With respect to the T-shaped space, not enough information has been provided to provide a definitive ruling. It is recommended that the project team first evaluate the use of this area relative to the definition of regularly occupied space. If it is determined to be regularly occupied, then the entire room should be considered perimeter space if 75% of that room is within 15 feet of the perimeter wall." "None" "None" "LEED Interpretation" "1650" "2006-12-15" "New Construction, Existing Buildings, Commercial Interiors, Core and Shell, Schools - New Construction" "IEQc6.1: Controllability of Systems-Lighting" "(Project is registered under NC 2.1 but will submit this credit according to the requirements of NC 2.2 through LEED Online) Our project is the new construction of a 47,000 ft2 4-story recreation/office building to serve as a community center for the Washington, DC Parks and Recreation department. The program consists of an indoor gymnasium and stage, multipurpose room, arcade, computer training room, offices, classrooms, weight and exercise room, and locker room facilities. Our lighting control strategy is to maximize energy efficiency while providing a suitable level of individual task lighting control for user workstations. The design solution is to offer dual purpose occupancy/ daylight sensors in multi-occupancy spaces, individual task lighting control for 90% of users in open and private offices, and multiple levels of switching in the gymnasium and stage. We are requesting an interpretation for the requirement to provide lighting system controllability for all shared multi-occupant spaces to enable lighting adjustment that meets group needs and preferences. The multi-occupant spaces in our project consist of a gymnasium, a multipurpose room, classrooms, and a weight and exercise room. With the exception of the gymnasium, each of these spaces is less than 2,500 square feet and is provided with at least 4 separate lighting controls as stated in LEED-NC Version 2.1 (Occupancy sensor, Daylight sensor). The occupancy sensor turns the lights on when it senses motion in the room while the daylight sensor keeps the lights from turning on if there is enough daylight. Two of these spaces, a computer training room, and an arcade, are located at the building interior. The controls are the same, but the daylight sensor function will be cancelled due to the lack of daylight in these spaces. The multi-purpose room has an additional level of lighting to accommodate special lighting needs that would require more flexibility. Thy gymnasium is 5800sf and the lighting design for this space is divided into 4 lighting zones, each zone provided with dedicated dual switching. Each light fixture includes two ballasts that are controlled by the dual switches. This space is therefore provided with a total of 8 lighting controls. Will this strategy meet the lighting control requirements for multi-occupant spaces? If it will not, what additional features need to be added to meet the minimum requirements?" "(Ruling per NCv2.2) The described approach to meeting the requirement for multi-occupant spaces appears to be satisfactory to achieve the credit, but additional information will be required in your submittal to confirm the design intent. You list the number of controls per room but do not relate these controls to the anticipated needs and preferences of the occupants in all cases. In your submittal, list the types of each control provided and provide a narrative to describe how the controls match the functionality of the room. For example, describe how the switches/sensors in the computer training room create different lighting levels in that room to support the different operating modes. Applicable Internationally." "None" "None" "X" "LEED Interpretation" "1726" "2007-04-09" "New Construction, Existing Buildings, Commercial Interiors, Core and Shell, Schools - New Construction" "IEQc6.1: Controllability of Systems-Lighting" "Our project, registered under LEED NC2.1, is a day care facility serving the staff and students of the nearby University of Texas at Austin Campus. As such, the regular occupants of the classrooms are children of such young age as to be incapable of operating heating or ventilation controls and arguably most are not even aware of the ability to do so. Compliance with credit EQ6.1 would be achieved on this project were it not for the required ventilation and heating controls required because the classrooms are considered multi-occupant spaces. We propose that a more proper classification of these spaces be determined by using the standard perimeter and non-perimeter calculations as only the staff in each room will be capable of adjusting the temperature and airflow controls on behalf of the students regardless of the configuration of such systems. Credit Interpretations for other credits have often allowed the consideration of staff in lieu of building occupants in calculations (ie: for number of bicycles in credit SS4.2) when building users are not in direct control of building systems, and we feel a similar argument can be made here. Is it acceptable to calculate the compliance of EQ6.1 as described above considering the unique circumstance that the very young age of the classroom occupants prevents them from using required controls should they be provided?" "Credit EQ6.1 applies specifically to perimeter spaces, which are defined in the LEED Version 2.1 Reference Guide language within this credit. The credit is based on the room area, and not on the number or type of occupants. The only ventilation and heating control requirement is to provide at least one operable window per 200 sqft floor area. To receive Credit EQ6.1 you must provide 1 operable window and 1 lighting control per 200 sqft floor area. Additional multi-occupant ventilation and heating control requirements are part of a separate credit, EQ6.2 and apply to non-perimeter spaces only. For EQ6.2, the spaces in question would qualify as multi-occupant spaces, per the definition in LEED v2.1 Reference Guide. These multi-occupant spaces are required to have control for each space, not for each occupant. For multi-occupant space thermal and ventilation control requirements under credit EQ6.2, refer to LEED v2.1 Reference Guide language for this credit. Applicable Internationally." "None" "None" "X" "LEED Interpretation" "1754" "2007-04-23" "New Construction" "IEQc6.1: Controllability of Systems-Lighting" "To document this credit for our LEED 2.1 project we are using the LEED 2.0 calculator, which discounts any space over 200 s.f. that has only one lighting control or one operable window. The LEED 2.1 credit requirement says to provide these controls ""on average"" for every 200 s.f. of space. If, for example, we have one individual office space of 180 s.f. and one of 220 s.f., each containing one control and one operable window, do these rooms comply with this credit since the ""average"" meets one for every 200 s.f.? If so, and the 220 s.f. space serves either one or two people, would this ""average"" still comply?" "The project is inquiring if the calculations for this credit can be done based on an average number overall (of operable windows and lighting controls) for the project, rather than on a per space basis. As noted in the credit requirements, projects must provide ""at least an average of one operable window and one lighting control zone per 200 square feet"" of the perimeter area. The proposed approach is therefore acceptable. Please also refer to the LEED-NC v2.1 Reference Guide page 286-290 for further guidance on calculating the various types of spaces. Applicable Internationally." "None" "None" "X" "LEED Interpretation" "1755" "2007-04-23" "New Construction" "IEQc6.1: Controllability of Systems-Lighting" "In our architectural office building, one of four perimeter open office spaces is designed to be leased. We have not included artificial lighting or lighting controls. Can we exclude that office space for this credit, or must we provide lighting controls as if for perimeter open office space, to be wired to a future lessee\'s own light fixtures? For all other credits and our total building occupant load, we are counting the occupancy of this lease space the same as our other three open office architecture studios, since it will ultimately be occupied for that purpose as our office staff grows, at 100 s.f. per occupant. This is local code for general offices, so occupant load would be the same. Is this acceptable?" "The project has a perimeter open office space that will be leased, and is inquiring if that space can be excluded from the calculations for this credit as the lighting systems will be installed by future tenants. The leased open office space as described is similar in nature to partial shell and core buildings previously addressed in the Administrative Inquiries CIRs ruling dated 2/22/2005, 10/4/2004, 5/24/2004, and 5/17/2002. For projects like this one, tenant fit-out guidelines would need to be in place to insure that the future build-out of this space will also meet the LEED prerequisites and requirements for the credits pursued. While the space can be excluded from this credit\'s calculations, the proposed approach of assuming the same occupant density (based on the other office spaces) would be acceptable for this space and should be used for all other relevant credits. Applicable Internationally." "None" "None" "X" "LEED Interpretation" "231" "2001-06-26" "New Construction, Schools - New Construction, Commercial Interiors, Core and Shell, Existing Buildings" "IEQc6.1: Controllability of Systems-Lighting" "Our team has selected to provide operable windows and light controls to achieve this credit. Our building skin is a repeating pattern of precast concrete panels and a glass curtainwall system. The building will house an open office work environment. Currently we have ?x? operable windows spaced 1? apart on the north and south elevation and 2? apart on the east and west elevations. It appears that the number of windows might be lower than specified however the large size windows exceed the normal operable office window. The intent of the goal appears to be achieved although we would like to assure that the requirements of the credit do not keep the project from earning this point. If quantity of windows is truly the issue our fenestration pattern dictates that the most cost effective place to add operable windows would be directly on top of those already in the design or simply break the ?x? window into two \'x? windows. Neither of these strategies appears to change the intent but would bring us within the credit guidelines. Also, our design team would like to confirm whether corridor space in an open office environment is considered a ""regularly occupied area"". There is a 6\' circulation path along the entire building perimeter that does not contain any work or meeting areas." "The intent of the credit is to provide a high level of occupant control at the perimeter of the building. The requirement results in an operable window at about every 13 feet along the exterior wall. As described, the project does not provide this level of functionality with operable windows occurring at roughly half the expected frequency. The number individual zones is then also about half the expected frequency, so the intent is not met. If the circulation zone is within the open office environment, then it is not a corridor. It is considered part of the regularly occupied area by LEED. Applicable Internationally. " "None" "None" "X" "LEED Interpretation" "2310" "2008-09-23" "New Construction, Existing Buildings, Commercial Interiors, Core and Shell" "IEQc6.1: Controllability of Systems-Lighting" "Our project is a multifamily residential building and we would like to verify our approach in meeting the requirements of credit EQ C6.1. Based on the CIR ruling dated 1/29/2008, by providing on/off controls for fixed lighting installed in spaces for individual use (kitchens, bedrooms) and shared multi-occupant spaces, this credit can be achieved. However, it is not clear if providing switched wall receptacles is an acceptable control measure for spaces with no fixed (permanent) lighting installed and hence our query. Our approach to the credit is outlined below 1) For the residential unit bedrooms, kitchen and dining rooms, fixed lighting will be installed, serving the needs of those spaces. On/off controls for the light fixtures will be provided. 2) In addition, the bedrooms will also have switched wall receptacles for the convenience of the tenants individual lighting needs. 3) The living rooms will not have any fixed lighting installed. A switched wall receptacle, allowing the tenant to choose their own light fixture, gives the tenant controllability of the light with an on/off switch. We believe that the intent of the credit to provide \'controllability\' of light is met, even if the actual light fixture is not permanently installed. 4) The living room will also have a junction box for a future fan or ceiling light, at the discretion of the tenant with a separate wall switch to control the fan and light independently. 5) The clubhouse area which can be regarded as a shared multi-occupant space will have occupancy sensors for lighting and also on/off switches for manual over ride. Please confirm that the above approach is acceptable." "The applicant is requesting clarification regarding the use of switched receptacles in residential applications to satisfy the credit requirements. The proposed approach appears to satisfy the credit intent. The LEED-NC v2.2 Reference Guide states that task lights do not need to be permanently wired and ideally allow the occupant to reposition the lighting fixture. This guidance is also applicable to group multi-occupant residential spaces. The living room, which is not equipped with fixed lighting, has been provided two separate controls: switched receptacles for non-fixed lighting fixtures and a junction box and lighting controls for a possible future fixture. The installation of switched receptacles provides occupants with another level of lighting control. In addition, all of the other spaces have been provided with fixed lighting that satisfies the requirements outlined in the 1/29/2008 CIR. When applying for this credit, the project team should also provide documentation to confirm that a sufficient number of lighting fixtures to provide the required space lighting have been connected to the proposed controls for group multi-occupant spaces.\n\n **Update October 1, 2013: Applicable credits have been updated." "5140" "None" "LEED Interpretation" "5138" "2008-09-15" "New Construction, Schools - New Construction, Commercial Interiors, Core and Shell, Existing Buildings" "IEQc6.1: Controllability of Systems-Lighting" "Our building has stacking glass walls on the south face of all floors. East walls of the first floor retail spaces have the same type of openings. The areas of these openings range from 90 sf to 400 sf when are they completely open. Where installed, these openings make up at least 75% of the entire wall area. We would like an equivalency for counting those areas toward the operable window requirement of IEQc6.1. We propose that the area of a standard window is 6 square feet. We request an allowance to account for 1 window for every 8 square feet of stacking glass. For example, a 90 sf stacking glass wall would equal 11.25 operable windows. Please confirm that this calculation method is acceptable." "The applicant is requesting an equivalency calculation between wall openings and operable windows. It is not clear from the description what types of openings are included in the ""stacking glass walls"". Typical retail spaces only have doors that may be held open when the climate is conducive to do so. If the only openings in the wall are primarily for entry and exit, the requested equivalency cannot be accepted. An operable window has a primary function to provide a user controllable and adjustable opening to maintain user required conditions in the space. A door does not have that type of primary function and does not qualify for the credit. Applicable Internationally." "None" "None" "X" "LEED Interpretation" "5465" "2005-07-19" "New Construction" "IEQc6: Controllability of Systems-Lighting and Thermal Comfort" "According to the LEED-NC Version 2.1 Reference Guide, EQ Credit 6.2 requires that controls for airflow and temperature be provided for 50% of the occupants for the regularly occupied non-perimeter spaces. The proposed design has provided one fan powered VAV terminal for approximately every 1000 square feet of the non-perimeter regularly occupied open office space. Each fan powered VAV terminal will have one (1) space temperature sensor for every two (2) people who will regularly occupy the space served by the respective terminal. The space temperature sensors have been placed in locations throughout the space in order to best record the overall space conditions where the occupants are located and also be readily accessible to them. The temperature sensors in the zone shall each send a room temperature signal to the VAV terminal zone thermostat controller. The zone thermostat controller shall average room sensor readings and control the VAV terminal supply airflow and temperature to maintain the averaged set point. This averaging control algorithm will operate continuously throughout the building occupied mode. The basis of this design approach allows occupant control and interaction with the HVAC system in their occupied zone while keeping the quantity and cost of the HVAC equipment to a minimum. Providing multiple temperature control sensors throughout the space provides increased energy savings by eliminating over-conditioning of the entire space which can result from the VAV terminal being controlled by a single sensor in an isolated extreme area. Allowing the occupants to set multiple averaging sensors to their desired settings avoids the extreme condition when a single sensor is arbitrarily set too high (or low) which increases the system operation. Maintaining occupant comfort is the main goal of this design approach and if occupants are comfortable it is likely that their individual health, attendance and output productivity will increase as well. We, therefore, request an interpretation as to whether this control design approach of providing a network of averaging temperature sensors throughout the non-perimeter regularly occupied open office space successfully meets the intent of Indoor Environmental Quality Credit 6.2. " "The control system described would not meet the intent and requirements of the credit, which specifically calls for individual control. The proposed control system would result in an average temperature determined by averaging the set point requests from everyone in the zone, and does not allow individual control of the space conditions. " "None" "None" "LEED Interpretation" "5699" "2005-01-18" "New Construction" "IEQc6: Controllability of Systems-Lighting and Thermal Comfort" "Our project consists of 2 large rooms - one for weight and fitness training, the other for aerobics. Both rooms meet the requirement for operable windows. The lighting is, however, controlled by occupancy sensors/daylight monitors to switch the lights, with one control per room. In this type of use there is no need for multiple switching or user controlled lighting (it would defeat the daylighting scheme and increase energy use). Can we earn this credit? " "These spaces would be considered group multi-occupant spaces. Please refer to page 289 of the LEED-NC v2.1 Reference Guide which discusses the requirements for group multi-occupant spaces. These requirements are based on the area of the space. The specific space area is not provided so there is insufficient information to determine if the project can earn this credit. Please note that for group multi-occupant spaces, both occupancy sensors and daylight controls count as two lighting controls each. Applicable internationally." "None" "None" "X" "LEED Interpretation" "5742" "2003-07-23" "New Construction" "IEQc6: Controllability of Systems-Lighting and Thermal Comfort" "Our project is a university housing complex consisting of low-rise apartment buildings. None of the spaces qualify as non-perimeter spaces, per the LEED v2 definition, and we are proposing an alternate approach to achieve the intent of this credit in a student housing setting. We are installing baseboard heaters in each room of the apartments with individual thermostats controlling each room. The majority of student housing projects we are aware of are built with several living areas or bedrooms served by each thermostat, resulting in discomfort as different occupants desire different space temperatures. Our project is installing the baseboard heating system in order to provide each student control over the temperature in his/her space. Will the USGBC accept this room-by-room zoning scenario as an alternate approach to achieving this credit in residential projects?" "Your project\'s approach to the heating control component of this credit is acceptable. In the scenario cited (the floor plan solely consisting of perimeter spaces), EQ Credit 6.2 will be awarded if the perimeter spaces are equipped with airflow, temperature and lighting controls per credit requirements and the additional requirements stated below. Note that LEED Version 2.0 and Version 2.1 have slightly different requirements and calculations. EQ Credits 6.1 and 6.2 will naturally overlap in this scenario, and thus the same lighting controls can count towards both credits and operable windows can be counted as airflow/ventilation control for EQc6.2. Integral thermostats installed on many inexpensive baseboard heaters are often inaccurate, lack space temperature indication, and thus provide poor occupant control or feedback" "None" "None" "LEED Interpretation" "5759" "2005-05-10" "New Construction" "IEQc6: Controllability of Systems-Lighting and Thermal Comfort" "Our project is the renovation of an historic armory to make a new home for a theater company. The building has masonry bearing walls and a barrel vaulted roof and occupies half of a block in an urban neighborhood. The building has three perimeter walls facing the street and one common wall with the adjacent building on the other half-block. Having been designed originally as an armory, the building has very few windows and no new windows can be added. The program includes two theaters, theater support spaces and the administrative offices for the theater company. The administrative offices are tucked up in the vaulted roof trusses on a new floor level created above the house of the main theater. This level is completely enclosed by the vaulted roof with no exterior walls. Regularly occupied perimeter spaces are limited to the ticket office on the ground floor, three offices on an intermediate level and an open office area and two private offices located along the edge of the vaulted roof at the top level. First we wish to confirm that only regularly occupied spaces within 15 feet of the three walls facing the street should be considered in EQc6.1, while regularly occupied spaces adjacent to the common wall with the adjoining building will be considered non-perimeter spaces falling under EQc6.2. Is this correct? Since the administrative offices at the top level do not have walls, windows cannot be provided, but this space will have new skylights. Though technically challenging, the design team is investigating the feasibility of providing operable skylights along the perimeter of the top level. If this proves feasible, will operable skylights be considered equivalent to operable windows for achievement of this credit? These skylights will be motorized with individual controls accessible to occupants. Alternatively, if operable skylights are not feasible can an alternative compliance path be considered for credit achievement? Credits 6.1 and 6.2 have a common intent to provide a high level of thermal, ventilation and lighting system control by individual occupants. We propose that if 100% of the regularly occupied perimeter spaces and 50% or more of regularly occupied non-perimeter spaces are provided with the individual temperature, ventilation and lighting controls as required for EQc6.2, this would meet the intent and requirements of BOTH credits, and therefore warrant the award of a point for each credit. The individual controls incorporated into this building will give the occupants a high level of control over the temperature, ventilation and lighting of their own environments, thus promoting productivity, comfort and well-being of the building occupants. Would this alternative compliance path be acceptable for the project to earn both EQc6.1 and 6.2? " "You are correct that common walls with adjoining buildings are not considered perimeter walls, and thus your project has just three perimeter walls. You are allowed to classify the offices under the vaulted roof as perimeter spaces, effectively treating the roof as a wall, and applying the space as such in all EQc6 calculations. To achieve the credit there must be operable windows, one per 200 SF on average (per space). As per the Reference Guide, exclude spaces such as enclosed hallways that are non-regularly occupied. Your proposal for EQc6.1 [to apply the non-perimeter space requirements (c6.2) to perimeter spaces (c6.1), as a path to being awarded c6.1 as well as c6.2] is not acceptable. Credit 6.1 exists for a reason. The Reference Guide indicates that operable windows are highly desired by building occupants. Natural ventilation provides a valued connection to the outdoors. Your interpretation request lends itself to consider an exception. Similar to EQc8.1, if the presence of windows is clearly a hindrance to a room\'s programming then the room is exempt from EQc6.1 requirements, but must comply with EQc6.2 requirements instead, in order to be eligible for c6.1. Such situations would have to be justified in the certification submittal credit narrative. If there is difficulty complying with the specific c6.2 requirements for a theater space (per the group multi-occupant requirements), credit achievement will be considered if you demonstrate that the theatres afford temperature, lighting, and ventilation controls to respond to the various uses (such as shows, rehearsals, and group activities) and areas (stage, main seating, balcony, etc). Applicable internationally." "None" "None" "X" "LEED Interpretation" "5858" "2005-01-26" "New Construction" "IEQc6: Controllability of Systems-Lighting and Thermal Comfort" "The INTENT is to provide a high level of thermal, ventilation and lighting system control by individual occupants or specific groups in multi-occupant spaces (i.e. classrooms or conference areas) to promote the productivity, comfort and well-being of building occupants. The requirement in the credit language states ""Provide controls for each individual for airflow temperature and lighting for at least 50% of the occupants in non-perimeter, regularly occupied areas."" LEED NC Version 2.1 Reference Guide expanded on how compliance with EQc6.2 could be accomplished for ""Group Multi-Occupant Spaces"" and established lighting, temperature, and airflow requirements for multi-occupant spaces. The reference guide states ""For each space less than or equal to 10,000 square feet in floor area, provide at least three separate lighting controls, one airflow control and one temperature control each for every 2,500 square feet; AND For each space greater than 10,000 square feet in floor area, provide at least three separate lighting controls, one airflow control and one temperature control each for every 10,000 square feet."" This expanded reference language seems to have referenced ASHRAE 90.1-1999 language in Section (a) that each control device shall control a maximum of 2500 ft2 for a space 10,000 ft2 or less and a maximum of 10,000 ft2 areas for a space greater than 10,000 ft2. Note that the control device refers to lighting control rather than HVAC control. For larger spaces such as cafeterias, auditoriums, and gymnasiums which are normally less or more than 10,000 ft2 each, the requirement for one temperature and airflow control each for every 2,500 square feet (<10,000 ft2) or each for every 10,000 square feet (>10,000 ft2) can result in these HVAC controls fighting each other compromising occupant comfort, the credit intent, and energy efficiency. Cafeterias, auditoriums, and gymnasiums spaces serve as a single, special group-functionality and usually house transient occupants for a short period of time. As such, it is more rational and sustainable in HVAC control design to treat such a special group-functional space as one single HVAC zone. In terms of HVAC control, ASHRAE 90.1 requires ""each zone shall be individually controlled by thermostatic controls responding to temperature within the zone."" The reference guide\'s defining HVAC controls in the same way as lighting controls is inconsistent with ASHRAE standards and in our opinion lack of rationale and inconsistent with the intent of the credit for a large interior zone with special group functions, such as a cafeteria or a gymnasium. For such functional space, the intent of this credit is still met with one temperature, one airflow control and adequate lighting controls. We, therefore, request clarification on zone size for multi-occupant spaces with special group function, such as gymnasiums, cafeteria and auditoriums, relative to the number of temperature and airflow controls required in a single zone. " "The ruling committee disagrees that it is ""more rational and sustainable"" to always treat multi-occupant spaces as a single zone. These spaces are often used for a variety of purposes, and may well benefit from multiple zones responding to different occupancy and program function patterns. It is this flexibility and adaptability that generates the recommended zone sizes. This is clearly relevant to lighting as the writer acknowledges. For this to be appropriate for temperature and airflow requires careful design, as the writer acknowledges that otherwise the controls can be inefficient and compromise comfort. However this argument is not limited to special group multi-occupant spaces, as open offices often face similar design challenges. Multi-occupant spaces with special group functions such as gymnasiums and cafeterias are considered to be regularly occupied spaces as noted in CIR ruling 10/5/04 and 11/9/01. As such their zone size is defined in the LEED NC 2.1 Reference Guide pgs 289 - 290. Exemptions for the number of airflow temperature or lighting controls for these spaces will not meet the credit intent of providing a high level of occupant control, and therefore are not acceptable in this instance. Applicable internationally." "None" "None" "X" "LEED Interpretation" "5869" "2004-10-05" "New Construction" "IEQc6.1: Controllability of Systems-Lighting" "The intent of this credit states, ""Provide a high level of thermal, ventilation, and lighting system control by individual occupants or specific groups in multi-occupant spaces (i.e. classrooms or conference areas)."" For an elementary school project, we would like to clarify if we can exclude the Gymnasium, Cafeteria, Staff Lounge, Library, and Health Suite Rest Area from our calculations. Though these spaces are typically occupied every day by different groups of students for short intervals of time, they do not meet the definition of ""Regularly Occupied Spaces"" as outlined in the LEED-NC Version 2.1 Reference Guide for EQ credit 6.1: ""Regularly occupied spaces are areas where workers are seated or standing as they work inside a building."" " "The intent of this credit is to encourage projects to incorporate strategies that provide the occupants a higher level of comfort through options to directly control their indoor environments. Schools are unique building types where the rooms and spaces are experiencing a continual flux of occupants (mostly as groups) and functions. The credit\'s group and individual multi-occupant instructions were created to address this type of programming. In regards to the definition of ""regularly occupied,"" there is no minimum time limit on spaces where people work. Please review ALL of the definitions on page 291 of the LEED-NC v2.1 Reference Guide to understand the total context. Even though K-12 students\' exposure to a particular space may come in relatively short intervals, overall they are fulltime occupants of the building and are affected by each room they occupy during the day. The faculty and staff also need to be served by this credit if it is to be achieved. The students are served even though they rely on the faculty and staff to control the lighting, etc. for their benefit. It would not be acceptable for maintenance staff to have the controls locked away such that only they can make adjustments. Gymnasiums, cafeterias, conference rooms, and libraries are all required to meet the credit because they are ""group multi-occupant"" spaces. The Health Suite Rest Area must comply as appropriate to its expected use. The Staff Lounge may be exempted only if it serves solely as a break room for short breaks. It is most likely the space where faculty work while not in classrooms, in which case it can not be exempted. Applicable internationally." "None" "None" "X" "LEED Interpretation" "5926" "2001-12-07" "New Construction" "IEQc6: Controllability of Systems-Lighting and Thermal Comfort" "There is some confusion regarding the calculation method of perimeter and non-perimeter rooms found in the LEED Reference Guide (formatted version of June 2001) on pages 253 and 256-257." "In order to accommodate a wide variety of spaces, including open office plans, please use the following calculation method: All areas within 15 FT of the perimeter wall are to be considered perimeter areas. All areas greater than 15 FT from the perimeter wall are to be considered non-perimeter areas. For rooms that are intersected by a line offset 15 FT from the perimer wall, the area of the entire room can be included as perimeter area if 75% or more of the room is within 15 FT of the perimeter wall. For such rooms, the designer must decide whether perimeter or non-perimeter controls are more appropriate for the remaining 25% of the room. Please include project assumptions in the credit. Applicable internationally." "None" "None" "X"