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" "10253" "2012-10-01" "New Construction, Schools - New Construction, Commercial Interiors, Core and Shell, Existing Buildings, Retail - New Construction, Retail - Commercial Interiors, Healthcare" "We would like to submit a CIR to request a streamlined approach for the daylight documentation. We have the particular condition of an identical cluster of office buildings. In spite of having the same foot print, each building will be uniquely impacted by orientation variation and specific surrounding context condition. The intent is to fully document one building showing that the amount of light increases as you move up through the floor plates. Then to proceed to document the worst case scenario of each building (ground floor) or the level that is least exposed to solar access. If the worst case scenario passes, then we infer based on our test case that the upper floors of the building will pass as well. This will help us streamline not only the documentation process for so many buildings but also the review process. Is this an acceptable documentation method for this credit?" "The project team is requesting whether a campus credit may be pursued for IEQc8.1. Daylight and Views: Daylight through a typical floor plan and worst case scenario daylight calculations.\n\nYes, the typical floor plan and worst-case scenario daylight calculations may be used for the campus credit and applied to all buildings within the master site that have identical floor plans. \n\nThe 2010 Application Guide for Multiple Buildings and On-Campus Projects identifies IEQc8.1 as an individual building credit and states that each building should pursue the credit individually. However, in the same way that a multi-story building may provide a single floor plan for each grouping of identical floors, if buildings within the Master Site are identical, the same documentation may be used for each identical building. \n\nAny of the calculation methods (simulation, prescriptive, measurement) may be used. Documentation for the campus credit and associated projects must demonstrate how the worst case scenario was determined and that the only difference in the buildings is the orientation on the site. The footprint, square footage and interior layout of the buildings must be identical. \n\nApplicable Internationally." "None" "None" "X" "LEED Interpretation" "1727" "2007-04-10" "New Construction, Existing Buildings, Commercial Interiors, Core and Shell, Schools - New Construction" "One wall of our building is a curtain wall. This curtain wall contains 4 different types of glazing, each with a different visible transmittance value, all within one room. We propose using the average visible transmittance value of the four types of glazing to do daylighting calculations for areas adjacent to the curtain wall. Please advise whether this approach is acceptable." "No, the method described of taking the overall average visible transmittance value of all four types of glazing within the curtain wall and using it for all areas adjacent to the curtain wall is not an acceptable means of calculating the daylight factor of the areas in question. However, doing a weighted average of the visible transmittance value (Tvis) of all the glazing classified as daylight glazing and a weighted average of the visible transmittance values of all the glazing classified as vision glazing on a room by room basis would be acceptable. This methodology would effectively take into account the window geometry and associated minimum visible transmittance values. Alternatively, the project team may elect to perform a daylight simulation model to demonstrate credit compliance. See the LEED NC v2.1 EQc8.1 ruling dated 6/21/2004 for guidance on pursuing this approach. Applicable Internationally." "None" "None" "X" "LEED Interpretation" "10280" "2013-04-01" "New Construction, Commercial Interiors, Core and Shell, Schools - New Construction, Retail - New Construction, Retail - Commercial Interiors, Healthcare" "The project team would like to exclude laboratory spaces from the list of regularly occupied spaces for the Daylighting and Views calculations. The laboratory spaces are separated from other building areas but efforts have been made to provide exterior views out of the lab spaces by providing fire rated windows around the lab into the surrounding hallways and drive aisle. The laboratory areas will be used solely for research and development purposes and for proprietary reasons & secrecy concerns of the areas, exterior windows have been specifically excluded from these rooms as they will be secure internal rooms being used by a very small percentage of the building occupants. " """The project team is requesting that laboratory spaces be excluded from the requirements for daylight and views (credits IEQc8.1 Daylight and Views: Daylight, IEQc8.2 Daylight and Views, and IEQc2.4: Daylight and Views.) for security reasons and/or due to infrequency of use. No, the laboratory spaces may not be excluded from daylight and views. It is unacceptable to exclude spaces from the daylight and views calculations due to security reasons. Additionally, based on the information provided, the laboratory spaces may not be excluded for infrequency of use because the spaces are typically occupied for more than one hour per day. The percentage of building occupants using the space is irrelevant. The frequency of use for regularly occupied spaces was further clarified in the definition of a regularly occupied space included in the LEED Reference Guide for Green Building Design and Construction, 2009 Edition addenda dated 11/1/2011 which states that regularly occupied spaces are ÔÇťareas where one or more individuals normally spend time (more than one hour per person per day on average) seated or standing as they work, study, or perform other focused activities inside a building."""" Applicable Internationally."" " "2344" "None" "X"