Pearl Building Rating System - Estidama

Annual External
Heat Gain
(kWh/m 2 )
Percentage
Change (%)
B Baseline 60.7 -
1 Orientation 59.9 -1.4%
2 Glazing ratio 86.5 +42.6%
3 Glazing SHGC 84.6 +39.4%
4 External shading 79.1 +30.3%
5 Building air leakage rate 79.1 +30.3%
6 Envelope conductive performance 45.7 -24.7%
� In order to achieve an additional point for the use of roofing materials with a high
SRI, the entire roof except those areas covered by mechanical plant, shading devices,
renewable technologies and designated vegetated roofs must use materials with a SRI
� 78.
� Roof areas covered by external shading devices are calculated as the portion of roof
area in shade measured at 12pm solar time on the summer solstice. The upper
surface of those shading devices must also use materials with a SRI � 78.
� Roofs are defined as the upper portion of the building envelope that are tilted at an
angle of less than 60 degrees to the horizontal.
� Where a building contains no roof surfaces (excluding areas covered by mechanical
plant, designated vegetated roofs and renewable technologies), the credit point is
awarded automatically.
� The SRI of a material shall be calculated based on solar reflectance and emittance
numbers as defined in the American Society of Testing and Materials Standard E1980-
01. Alternatively manufacturer’s evidence can be supplied where the testing is in
accordance with the referenced standards below.
References � ASTM E1980 - 01 Standard Practice for Calculating Solar Reflectance Index of
Horizontal and Low-Sloped Opaque Surfaces
� ASTM E1918-06, Standard Test Method for Measuring Solar Reflectance of Horizontal
and Low-Sloped Surfaces in the Field
Pearl Building Rating System: Design & Construction, Version 1.0, April 2010 154 of 223