Looking to lower your electric bill? Wondering if a new roof save energy and money?
Yes, a new roof almost always saves energy and subsequently, lower your utility bill. Older attics and roofs are likely to be outdated in a variety of ways.
A cool roof is measured in two ways: reflectance (how much solar radiation is bounced away) and emissivity (how much absorbed solar radiation is released). The more reflectance and emissivity, the better.
On a summer day, the typical asphalt-shingle roof can sizzle at 140-170 degrees Fahrenheit. But when made with white asphalt shingles, that same roof is 30-50 degrees cooler. Not only will you save on air condition costs, but you’ll also see a longer roof lifespan.
Other cool roof materials for steep slopes include unpainted metal, “cool-colored” tiles and wooden shingles. With proper preparation, all of these can achieve ENERGY STAR certification.
If you have a pre-existing flat roof, you might roll on a cementitious or elastomeric coating to improve its solar reflectance. Costs usually range from $0.75 to $1.50 per square foot.
For that matter, any ol’ modified bitumen or BUR roof can be cooled by lightening its color or adding reflective granules. Existing asphalt surfaces can be slathered with two coats: one to increase reflectance, and the other to increase emissivity.
Pre-Existing Roof Additions
The simplest solution to a scorching roof is to treat it like a human being: Douse it with water. Placing a garden sprinkler on the rooftop uses evaporative cooling to reduce roof temperature by 10-20 degrees. For long-term use, you ought to invest in a roof misting system.
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