The crrc rates roofing products and systems by measuring two important thermal properties.
Roof tile title 24 aged solar reflectance zone 9.
A cool color is defined as any product with an aged solar reflective index sri of 16 or greater actual or calculated.
To see which climate zone your project is in and the requirements associated with your building structure visit the cec s website.
Only the aged solar reflectance and emittance values listed within the crrc rated products directory may be used to meet the cool roof requirements in the energy standards.
In our example we are using tile roofing with a weight greater than 5 lb sq.
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.
Overview of the ca title 24 standards.
The los angeles green building code reflectivity requirement for a residential asphalt shingle is a minimum 3 year aged solar reflectance of 0 20 a minimum thermal emittance of 0 75 or a sri solar reflectance index of 16.
All rated roofing products will have a crrc label with the efficiency values listed.
The title 24 standards do not require a cool roof on a residence when energy compliance is achieved using the performance method.
A comparison between the way u s.
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.
The solar reflectance and thermal emittance values of roofing products.
As temperatures warm around the brazos valley many home owners take the opportunity to reroof their old roof for a roofing system that is more energy efficient.
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.
That is your cool roof specification for your roofing product.
If your project meets one of the following conditions you can use any profile in any color on the roof.
Title 24 also rates sr after 3 years a value known as aged solar reflectance.
In a study by shiao and kalkanoglu during the.
This is also tied to thermal resistance of a roof as well.
The below resources are not official title 24 documents.
The roofing material s ability to reflect solar energy back into the atmosphere.
Located in climate zones 1 9 and 16.
One of the biggest factors in energy efficiency in bryan roofing is the ability of the roofing material to reflect solar energy.
