Metal Roof Reflectance

The cool metal roofing paint resin formula formulated by sherwin williams or another paint supplier contains innovative solar reflective pigments which is the key differentiator.

Metal roof reflectance.

Berridge metal roofing is cool and sustainable the high reflectivity emissivity and solar reflectance index sri of berridge metal roofing helps mitigate the heat island effect. A cool roof generally has a reflectivity higher than 65 percent or 65. The sr value is a number from 0 to 1 0. Reflectance in relation to metal roofing refers to uv and infrared light rays being reflected from the roof surface.

Reflective surfaces help keep a building cool during the summer decreasing the cooling load and saving energy. Energy star requires an initial sr value of 0 25 or higher for steep slope 2 12 roofs and 0 15 or greater after three years. Innate reflectance is measured on a scale from 0 to 1 with the latter being the highest level of reflectivity meaning it reflects 100 of all radiant energy coming in contact with it. Cool metal roof colors are optimal for reducing energy consumption particularly where cooling loads dominate.

A cool metal roof with high solar reflectance and high thermal emittance would have a lower surface temperature as compared to a roof with low reflectance and low emittance. Reflectance refers to the roofing material s ability to reflect the energy coming from the sun instead of absorbing it. Berridge s kynar 500 hylar 5000. Considering that roofs and attic spaces are a major source of whole home solar heat gain reflectivity can be an amazing energy efficient bonus.

In the case of a cool metal roof a lower surface temperature translates into less heat gain into the attic space or living space below the roof. A highly reflective and highly emissive painted or granular coated metal roof is optimal for reducing energy consumption and can actually re emit up to 90 of absorbed solar radiation. Reflectivity is expressed as either a percentage of the sun s rays reflected or the decimal equivalent of that percentage. Metal roofs with oven cured pre painted organic coatings that incorporate new cool pigment technology offer high total solar reflectance and high infrared emittance even with darker colors.

The benefits of cool metal roofing cool metal roofing has many benefits beyond savings on energy costs.