The higher the solar reflectance the better the more heat is reflected from the roofing material.
Roof tile title 24 aged solar reflectance climate zone 9.
That is your cool roof specification for your roofing product.
Timberline hd reflector series plus shingles meet green building standards code of los angeles county for residential buildings.
Aged solar reflectance index of 20 or a minimum sri a sri of 16 requirements vary by zone depending on the building and the climate method.
Timberline hd reflector series plus shingles can be used to comply with 2016 title 24 part 6 cool roof requirements of the california code of regulations.
Timberline hd reflector series plus shingles are rated by.
On a steep slope roof greater than 2 12 and for climate zone 8 the cool roof requirements are an aged solar reflectance of 0 15 and a thermal emittance of 0 75.
A comparison between the way u s.
California building climate zone map.
The title 24 standards do not require a cool roof on a residence when energy compliance is achieved using the performance method.
To see which climate zone your project is in and the requirements associated with your building structure visit the cec s website.
Aged solar reflectance and emittance values listed within the crrc rated products.
California energy commission 8 6 9 16 10 building climate zones county boundary 0 50 100 200.
Cool roof shingles roofing products with high solar reflectance and thermal emittance are referred to as cool roof which is the outer layer or exterior surface of a roof.
Aged solar reflectance thermal emittance specific aged solar reflectance and thermal emittance values must be met or exceeded for some climate zones and roof types see page 2.
Energy efficient cool roofs.
California s building energy efficiency standards for residential and nonresidential buildings title 24 part 6 contains requirements for the thermal emittance three year aged reflectance and solar reflectance index sri of roofing materials used in new construction and re roofing projects.
Additionally the code requires an area of the roof to be solar ready 250 square feet within 110 to 270 north with no roof penetrations or shade.
Many of the code requirements are climate zone cz specific.
Environmental protection agency s epa s energy star program california s title 24 and the leadership in energy and environmental design leed rating system qualify a cool roof in terms of solar reflectance sr and thermal emittance te or solar reflective index sri.
In our example we are using tile roofing with a weight greater than 5 lb sq.
The roofing project is in an affected california climate zone.
Any replacement recovering or recoating of the exterior surface of the existing roof where greater than 50 of the existing roof surface area or 2 000.
Tile roof on single family home.
9 building climate zones california 2017 source.
