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.

This is also tied to thermal resistance of a roof as well. As such it plays an equal if not greater role in defining what s a truly energy efficient roof. The effectiveness of a cool roof is measured by solar reflectance and thermal emittance. For example a good white coating with a solar reflectance of 0 8 typically has a visible reflectance of about 0 9.

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. In a study by shiao and kalkanoglu during the. Just like reflectance the emittance of the roof is measured on a scale of 0 to 1 with 1 being the highest. Both properties are measured individually from 0 to 1 0 with 1 0 being the material with the best performance.

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. These shingles are engineered to have higher solar reflectance and thermal emittance properties that can. A roof plays a critical role for your home. This is the reflectance in the visual part of the solar spectrum wavelengths of 400 to 700 nanometers.

Usually the visible reflectance is correlated with the solar reflectance but the two quantities are not equal. Ul testing and certifications. One of the biggest factors in energy efficiency in bryan roofing is the ability of the roofing material to reflect solar energy.