SS Credit 7.2: Heat Island Effect—Roof 1 Point Intent To reduc

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SS Credit 7.2: Heat Island Effect—Roof
1 Point

Intent
To reduce heat islands1 to minimize impacts on microclimates and human and wildlife habitats.

Requirements
OPTION 1
Use roofing materials with a solar reflectance index2 (SRI) equal to or greater than the values in the table below for a minimum of 75% of the roof surface. Roofing materials having a lower SRI value than those listed below may be used if the weighted rooftop SRI average meets the following criteria:
Area Roof Meeting Minimum SRI/Total Roof Area x SRI of Installed Roof/Required SRI ≥ 75%
Roof Type ; Slope ;SRI
Low-sloped ;roof ≤ 2:12; 78
Steep-sloped; roof > 2:12 ;29
OR
OPTION 2
Install a vegetated roof that covers at least 50% of the roof area.
OR
OPTION 3
Install high-albedo and vegetated roof surfaces that, in combination, meet the following criteria:
Area Roof Meeting Minimum SRI/0.75+ Area of Vegetated Roof/0.5 ≥ Total Roof Area
Roof ;Type Slope ;SRI
Low-sloped ;roof ≤ 2:12 ;78
Steep-sloped ;roof > 2:12 ;29

Potential Technologies & Strategies
Consider installing high-albedo and vegetated roofs to reduce heat absorption. Default values will be available in the LEED Reference Guide for Green Building Design and Construction, 2009 Edition. Product information is available from the Cool Roof Rating Council Web site at http://www.coolroofs.org/ and the ENERGY STAR® Web site at http://www.energystar.gov/.


SSC 7.2: 热岛效应—屋面部分
1分

目的
降低热岛效应1，减少对区域微气候、人类和野生物种的环境影响。
要求
选项1
最少75%的屋面面积采用符合以下太阳反射系数2 (SRI) 的材料.
较低的SRI材料也能使用，只是其屋面权重计算的SRI要符合以下要求：
满足最小SRI屋面面积/ 屋面总面积 X 装配的屋面SRI/要求的SRI >=75%
屋面类型;坡度;SRI
低坡度;屋面<2:12;78
斜坡;屋面>2:12; 29
或者
选项2
50%以上的屋面采用种植屋面。
或者
选项3
配置高反光屋面和种植屋面，组合起来应满足以下要求：
符合最小SRI的屋面面积/0.75 +绿化种植屋面面积/0.5 >=屋面总面积

屋面类型;坡度;SRI
低坡度;屋面<2:12 ;78
斜坡;屋面> 2:12 ;29

技术措施和策略
屋面采用高反光材料和种植屋面，以降低屋面吸热，LEED 2009参考手册中给出了相应的默认值。
产品资料可从清凉屋面协会网站中查询， http://www.coolroofs.org/ and the ENERGY STAR®
Web site at http://www.energystar.gov/。