1、LEEDfor Homes Rating SystemJanuary 2008U.S. Green Building Council -1- January 1, 2010 Corrections, Clarifications 87.5%; 75%; 62.5%; 50%; 37.5%; 25%; and 12.5%. Values in column 3 should be: 0%; 12.5%; 25%; 37.5%; 50%; 62.5%; 75%; and 87.5%. Pg. 85 left column, sixth box should be “EQ 8.2”, not “EA
2、 8.2”. Pg. 86, Table 28 first column, fourth row should be changed from “Energy b) buildings with no mechanical cooling that are located in zone 1 or 2 of the IECC 2004 Climate Zone Map; and c) buildings that are thermally conditioned for human occupancy for less than 876 hours per year. Pg. 95: Und
3、er B. Nonducted HVAC Systems, there should be an “OR” between 7.2 and 7.3. Pg. 98: Upon review, painting has not been shown to be effective in limiting CO exposure. Part a-iii is not required by any project as a condition for earning EQ 10.2. Pg. 111: The Glossary definition of Infiltration Degree-D
4、ays is incorrect. Although heating degree-days and cooling degree-days may be a reasonable proxy for IDDs, it is not correct. The true definition of IDDs is provided in ASHRAE Standard 119-1988 (RA 2004) and it requires a rigorous calculation to determine. General Clarification: LEED for Homes canno
5、t be offered outside of the US at this time because of the technical limitations of adapting the rating system to local codes and the logistical limitations of providing a uniform international verification network. This decision will be revisited in 2012. Canadian projects should pursue LEED Canada
6、 for Homes, offered by the CAGBC. Any project that registered with LEED for Homes prior to the release of LEED Canada for Homes can be certified under LEED for Homes. U.S. Green Building Council -3- January 1, 2010 Clarification: For multi-family buildings, it is unacceptable to have significantly d
7、isparate benefits for different units. A credit or prerequisite is not met if less than 100% of the units satisfy the requirements. For example, PV may only be credited if it serves all of the units / occupants. (EA 10-10) Home Size Adjuster (HSA) Clarification: For group homes (e.g., dormitories, a
8、ssisted living facilities, if a building has 9 units or fewer, treat the building as a single-family home (i.e., include all conditioned space). For buildings with 10 or more units, include both in-unit and residential-associated spaces (communal areas that serve residents) in the home size calculat
9、ion. Residential-associated space should be divided evenly among the units within the multi-family home size calculator. (HSA 02). Interpretation: When determining the square footage of the home for the HSA, include all directly conditioned space within the thermal boundary, calculated to the exteri
10、or wall. Include all normal living spaces and service areas (e.g., garages, utility rooms, closets, entries, crawl spaces, attics, basements) that are within the thermal boundary and meet ANSI Z765 requirements for ceiling height EXCEPT those that are separated from primary living spaces by insulate
11、d, weatherstripped doors AND are neither directly heated nor cooled. In the rare case of mild climates where normal living spaces in the home are neither heated nor cooled, include all spaces that are reasonably expected to be used as living areas or are normal adjuncts to living areas, such as clos
12、ets, utility rooms, entries, etc. Enforced for all projects registered after January 1, 2010 Innovative Design Process (ID) ID 1.2 Integrated Project Team Clarification: The “project team” does not include the Provider and/or green rater. For part (a), the credit should be changed to “Include team m
13、embers, not including the builder or Green Rater, whose capabilities include” Clarification: For part (c), if a project is on hold or inactive, monthly meetings are not required. (ID 01-03) ID 1.3 Professional Credentialed with Respect to LEED for Homes Clarification: ID 1.3 may only be awarded on t
14、he following conditions: 1) the person with the credential must be a principal member of the project team, and not a member of the verification team (e.g., not the Green Rater for the project); 2) the person with the credential must play an ongoing role on the project team, including participation i
15、n meetings, etc.; 3) the credential must be earned prior to the projects preliminary rating. There are currently no credentials or levels of experience that are considered equivalent to LEED AP Homes. (ID 01-06) U.S. Green Building Council -4- January 1, 2010 ID 2.1 Durability Planning Clarification
16、: For part (c), the use of paper-faced backerboard that meets ASTM mold-resistant standards is acceptable for exposed walls and behind fiberglass surrounds. It is not acceptable for use behind tile. (ID 02-17) Clarification: For part (c), the use of nonpaper-faced backerboard only applies to walls n
17、ear tubs, showers, and spas. It is not required on ceilings or bathroom walls not near the tub, shower, or spa. (ID 02-16) ID 3 Innovative or Regional Design Clarification: Exemplary performance credit is not available for process or education related credits (e.g., ID 1.2-1.4; AE credits). Location
18、s and Linkages (LL) LL 1 LEED for Neighborhood Development Clarification: Projects do not need to complete LEED-ND certification before earning this point, but the requirements of Stage 2 must be met. (LL 01-02) 98381481 LL 2 Site Selection Clarification: Part (a) cannot met by raising a home off th
19、e ground. (LL 02-15) Clarification: If there are existing built features within 100 ft that will not be disturbed, these are exempted from LL 2 part (c). If there are existing built features within 100 ft that will be disturbed, the project does not meet LL 2 part (c) and credit LL 2 cannot be earne
20、d. (LL 02-11) LL 3.1 / 3.2 Edge Development / Infill Clarification: Where the term “borders previously developed land” is used, the adjacent land must have development that is at least 5 years old. (LL 03-08) Clarification: Where the term “borders previously developed land” is used, the land itself
21、must be developed. Being located adjacent to a lot with development located on it is not sufficient unless the development is immediately adjacent to the LEED project. (LL 03-09) Clarification: If the home is located in a new development, then the term “development site” includes all of the new home
22、 sites in that new development, not just the one building site that is to be certified. Clarification: If a project borders a body of water, this border should not be included in the calculation i.e. it should not be a credit or penalty. (LL 03-07). U.S. Green Building Council -5- January 1, 2010 Cl
23、arification: If a project borders a park or is a corner lot, the adjacent park or roadway shall be treated as non-existent (i.e., assessment is to be based on the land on the other side of the park, or the land on the other side of one of the roadways). Interpretation: LL 3.3 may only be awarded if
24、75% of the total buildable land for the project was previously developed. This applies to single-family and multi-family projects. If the LEED home is built on the footprint of a previously existing structure, but this footprint comprises less than 75% of the total buildable land, LL 3.3 should not
25、be awarded. (LL 03-11) Enforced for all projects registered after January 1, 2010 Clarification: A home that is part of a new development (e.g. mile of walking because of highways or other obstructions, the resource should not be counted. Enforced for all projects registered after January 1, 2010 Ex
26、emplary Performance: Projects can earn 1 ID point if they are within mile of transit services that offer 250 or more transit rides per weekday. (LL 05-02) Exemplary Performance: Projects can earn 1 ID point if they are within mile walking distance of 28 community resources. As per the Rating System,
27、 projects may not take credit for more than 2 of the same type of community resource. (LL 05-05) LL 6 Access to Open Space Interpretation: The distance requirements must be calculated based on walking distances, not “as the bird flies”. For example, if a community-based open space is within mile on
28、a map, but U.S. Green Building Council -6- January 1, 2010 requires mile of walking because of highways or other obstructions, it cannot be counted. (LL 06-04) Enforced for all projects registered after January 1, 2010 Sustainable Sites (SS) SS 1.2 Minimize Disturbed Area of Site Correction: In part
29、 (b), the term “buildable lot area” should be replaced with “lot area, not including area that is legally protected from disturbance.” Setbacks from the road are generally not buildable, but should still be preserved, if possible. Enforced for all projects registered after January 15, 2009 Clarifica
30、tion: Part (a) and (b) apply only to sites that are not previously developed or “disturbed”. Undeveloped sites with substantial amounts of garbage and/or invasive weeds should be treated as previously disturbed sites. SS 2.2 Landscaping Interpretation: The Glossary definition of “Conventional Turf”
31、refers to “considerable watering, mowing, and/or fertilizers.” The intent is that any turfgrass that requires routine watering, mowing, or fertilizers should be considered conventional for the purposes of SS 2.3. Even turf identified as drought-tolerant may qualify as “conventional” for the purposes
32、 of SS 2.3. Further guidance on differentiating grasses for LEED for Homes is forthcoming from USGBC. Enforced for all projects registered after January 1, 2010 Interpretation: For SS 2.5, if a grass has almost no mowing requirements (i.e., does not need to be mowed more than once or twice a year) a
33、nd has no fertilizer / chemical requirements, the species may be treated as a groundcover in the calculation, which means a species factor (Ks) between 0.2 and 0.7 may be chosen. For all other cases, a species factor (Ks) between 0.6 and 0.8 mu st be chosen. Enforced for all projects registered afte
34、r January 1, 2010 Clarification: Projects that have no space for landscaping (e.g. buildings constructed to the edge of the lot line) may only earn points in SS 2.2-2.5, SS 3 (a), and WE 2.1-2.3 if a vegetated roof is installed and the vegetation meets the credit requirements. No points are availabl
35、e for SS 4.1 or 4.2. Interpretation: Credits in the SS (2) information or references about native and drought-tolerant plants must be provided to the U.S. Green Building Council -7- January 1, 2010 homeowner; and 3) no points may be awarded in SS 2, SS 3 (a), SS 4.2 (b), or SS 5 (d). Half-credit may
36、 be granted for SS 4.1, but only if all final hardscapes are installed, including driveways, walkways, patios, etc. No credit may be awarded for SS 4.3 unless infiltration features are installed. (SS Gen-24; SS 04-36) Interpretation: For projects that choose or are only able to install 50% of the de
37、signed landscaping, points are available in the following way (credit requirements must be met in order for points to be awarded): o SS 3 half credit is available, but all hardscapes must be installed and the hardscapes must meet the requirements through shading of installed vegetation or SRI values
38、; o SS 4.1 - Half credit available. All final hardscapes must be installed, including driveways, walkways, patios, etc. o SS 4.2 - Full credit available, if all relevant erosion control measures are installed. o SS 4.3 - Full credit available, if all relevant stormwater controls are installed. o WE
39、1 Full credit is available. In the case of WE 1.1 for outdoor applications, the project team must submit a calculation demonstrating that the installed landscaping will need at least as much water as what will be collected for re-use. o WE 2.1 and WE 2.2 Half credit available, based on irrigation me
40、asures installed to serve installed landscaping. Enforced for all projects registered after January 1, 2010 Clarification: Landscaping does not have to be fully established prior to certification; if the lot is seeded and mulched, the project can earn credit as appropriate in SS 2.2-2.5. (SS 02-38)
41、Clarification: For areas with non-vegetated natural groundcover (e.g., bare mulch, pinestraw): If 50% of the designed landscaped is non-vegetated groundcover, the project must follow the prescriptive pathway. Non-vegetated natural groundcover can be used to earn SS 2.3 if the landscape professional
42、considers it final, but it cannot earn credit under SS 2.4 or any credits under WE 2. If mile of walking because of highways or other obstructions, the resource should not be counted. LL 6 Access to Open Space Interpretation: The distance requirements must be calculated based on walking distances, n
43、ot “as the bird flies”. For example, if a community-based open space is within mile on a map, but requires mile of walking because of highways or other obstructions, it cannot be counted. (LL 06-04) SS 2.2 Landscaping Interpretation: The Glossary definition of “Conventional Turf” refers to “consider
44、able watering, mowing, and/or fertilizers.” The intent is that any turfgrass that requires routine watering, mowing, or fertilizers should be considered conventional for the purposes of SS 2.3. Even turf identified as drought-tolerant may qualify as “conventional” for the purposes of SS 2.3. Further
45、 guidance on differentiating grasses for LEED for Homes is forthcoming from USGBC. Interpretation: For SS 2.5, if a grass has almost no mowing requirements (i.e., does not need to be mowed more than once or twice a year) and has no fertilizer / chemical requirements, the species may be treated as a
46、groundcover in the calculation, which means a species factor (Ks) U.S. Green Building Council -23- January 1, 2010 between 0.2 and 0.7 may be chosen. For all other cases, a species factor (Ks) between 0.6 and 0.8 must be chosen. Interpretation: Credits in the SS o SS 4.1 - Half credit available. All
47、 final hardscapes must be installed, including driveways, walkways, patios, etc. o SS 4.2 - Full credit available, if all relevant erosion control measures are installed. o SS 4.3 - Full credit available, if all relevant stormwater controls are installed. o WE 1 Full credit is available. In the case
48、 of WE 1.1 for outdoor applications, the project team must submit a calculation demonstrating that the installed landscaping will need at least as much water as what will be collected for re-use. o WE 2.1 and WE 2.2 Half credit available, based on irrigation measures installed to serve installed lan
49、dscaping. SS 5 Nontoxic Pest Control Interpretation: A project with a non-cellulosic structure can meet part (a) if all wood, including siding, trim, etc. meet the credit requirements. (SS 05-20) EA 7.1 Efficient Hot Water Distribution Interpretation: For EA 7.1, determine ceiling height by measuring the floor-to-floor distance. No additional branch length should be allowed for homes with a basement, and a basement should not be considered an additional story for EA 7.1. (EA 07-32) Interpretation: Basements should
