Buildings can earn a credit for reducing the heat island effect with a high reflectance roof but it depends on the type of roof.
Leed sri roof pavers.
Sri as an option for qualification.
In the earlier leed 2009 requirements cool roofing did not consider age.
Solar reflectance index sri.
Cool roof pavers cut sheet.
Solar reflective color pavers reflect the sun s heat keeping the surface cooler reducing the heat island effect demand for air conditioning and improving air quality.
As of august 2006 62 of leed project qualified for credit 7 1.
With pavers yielding high reflectance and emittance values hanover pavers earn sustainable site credits and help to achieve leed certification.
For leed v4 in existing buildings low sloped roofs must have an initial sri of 82 or a three year aged sri of 64.
Sri measures the roof s ability to reject solar heat defined such that a standard black reflectance 0 05 emittance 0 90 is 0 and a standard.
A steep sloped roof must have an initial sri of 39 or a three year aged sri of 32.
Manufacturers of concrete unit pavers for over 40 years for on grade and roof applications for architectural commercial and residential projects.
Sri solar reflectance index a measure of the surface s ability to reject solar heat basalite sri colors meet or surpass the leed sri threshold of 29 the sun s radiation hits.
So white concrete default value would exceed this value.
However based on cir 10411 which lists a 3 year aged value of white concrete of 0 35 it would not meet the leed v 4 3 year aged sri of 64.
Currently to qualify for these points samples of the paving and roofing materials must be tested according to specified test procedures.
Leadership in energy and environmental design leed is the green building rating system developed by the united states green building council usgbc the intent is to provide a standard certification process that registers buildings constructed with environmental performance efficiency and occupant health.
According to leev v 4 requirements initial sri for a roof material has to be 82.
Projects seeking leed v4 have the option of qualifying using either initial sri or by obtaining the 3 year aged sri value.
Incorporates both solar reflectance and thermal emissivity in a single value.
Tile tech cool roof pavers have a minimum sri value of 78.
As shown in table 1 the minimum sri for cool roofing has increased in the newer leed v4.
Leed is transforming the marketplace because architects increasingly specify materials that qualify for leed points.
For leed compliance please reference the sri values for the berridge color finishes below.
Our cool roof pavers utilize a high reflective value and low emissivity rate resulting in a high solar reflectance index sri value.
Green roofs and leed certification.
Steep sloped roofing with an sri of at least 29 for a minimum of 75 of the roof surface credit 7 2.
