Roof Tile Title 24 Aged Solar Reflectance Zone 9

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.

Roof tile title 24 aged solar reflectance zone 9.

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. One of the biggest factors in energy efficiency in bryan roofing is the ability of the roofing material to reflect solar energy. A comparison between the way u s. 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.

A cool color is defined as any product with an aged solar reflective index sri of 16 or greater actual or calculated. All rated roofing products will have a crrc label with the efficiency values listed. The below resources are not official title 24 documents. Please refer to the actual code pdf for the requirements.

You can also contact the california energy commission by phone 800 772 3300 toll free in california or 916 654 5106 outside california or email title24 energy ca gov. In our example we are using tile roofing with a weight greater than 5 lb sq. The solar reflectance and thermal emittance values of roofing products. Title 24 also rates sr after 3 years a value known as aged solar reflectance.

This is also tied to thermal resistance of a roof as well. The crrc rates roofing products and systems by measuring two important thermal properties. The title 24 standards do not require a cool roof on a residence when energy compliance is achieved using the performance method. In a study by shiao and kalkanoglu during the.

To see which climate zone your project is in and the requirements associated with your building structure visit the cec s website. 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. 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. Overview of the ca title 24 standards.

Located in climate zones 1 9 and 16. 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. That is your cool roof specification for your roofing product.