Roofs With A Solar Reflectanace Of 4 Or Greater

Emittance on the other hand refers to the roofing material s ability to shed heat rather than retain it.

Roofs with a solar reflectanace of 4 or greater.

Ul testing and certifications. Just like reflectance the emittance of the roof is measured on a scale of 0 to 1 with 1 being the highest. The effectiveness of a cool roof is measured by solar reflectance and thermal emittance. This is also tied to thermal resistance of a roof as well.

Usually the visible reflectance is correlated with the solar reflectance but the two quantities are not equal. These shingles are engineered to have higher solar reflectance and thermal emittance properties that can. A roof plays a critical role for your home. Solar reflective shingles are designed specifically to reduce the absorption of the suns infrared radiation by reflecting ir rays off the surface of the roof thus not allowing the heat to be transferred to the interior of the structure i e.

Ul evaluates solar reflectance roof covering materials using requirements developed by many sources. The attic under the roof. Both properties are measured individually from 0 to 1 0 with 1 0 being the material with the best performance. It helps protect it from the elements and impacts its overall exterior look and curb appeal further an asphalt shingle roof can potentially deliver energy saving benefits when cool asphalt shingles are installed.

For example a good white coating with a solar reflectance of 0 8 typically has a visible reflectance of about 0 9. 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. In a study by shiao and kalkanoglu during the.