Weight Of A Cool Roof

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Weight of a cool roof.

A cool roof is a roofing system that delivers higher solar reflectance the ability to reflect the visible infrared and ultraviolet wavelengths of the sun reducing heat transfer to the building and higher thermal emittance the ability to radiate absorbed or non reflected solar energy than standard designed roofing products. Cool roofs can contribute to lower home energy costs by keeping your roof cooler throughout the year. Cool roofing is not an entirely new concept. A built up roof for example will typically include the built up membrane itself with or without gravel as well as some kind of insulation and cover board which will vary in thickness from roof to roof.

Combined with the fact that sunlight is directly reflected back at the sun cool roofs can positively impact the environment with lower co2 emissions. Depending upon the type of material you choose the roof on a 2500 square foot home may be as little as 1750 pounds or as much as 50 000 pounds. It seems hard to believe but it s true. Historically cool roofs have been either white.

A cool roof under the same conditions could stay more than 50 f cooler and save energy and money by using less air conditioning. Roof temperature is rated via solar reflectance and thermal emittance with ratings ranging between 0 and 1. As in golf the higher the rating the lower the. Researchers have been studying materials that can reduce solar reflectance and thermal emittance for decades if only so that energy consumption due to cooling buildings could be reduced.

This results in lower absorption of solar heat and a cooler roof. When it comes to estimating the weight of an existing roof field verification of the in place construction is necessary. But over the past few years the number of cool roofing materials and options has. The first cool roof material was introduced in california in 2001.

Cool roofs are designed to lower the temperature of your home in summer months making you more comfortable and potentially reducing your energy bill. In today s market a cool roof is defined by the reflectivity and emissivity requirements set by either title. Cool roofs can be made of a highly reflective type of paint a sheet covering or highly reflective tiles or shingles. Standard weight lightweight concrete roof tile availability varies by region.

Standard or dark roofs can reach temperatures of 150 f or more in the summer sun.