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Latex Paint Cools Off Roof
Karol Kazmierczak put old paint to good use, covering his brown asphalt shingles with a lighter color. Once the paint dried, Kazmierczak checked the roof with an infrared camera. The painted area was 20 degrees cooler than an unpainted test strip.
  “The difference in temperature also showed up the next day when the air conditioning didn’t come on,” notes Kazmierczak. “The paint lowered the temperature in the building attic where the cooling ducts run.”
  While noting that lots of factors affect energy consumption, Kazmierczak did report that his energy bill fell 10 to 20 percent after painting the roof.
  Kazmierczak, an independent consulting and diagnostic engineer, detects problems in building designs for a living. He previously attempted to reduce the heat absorbed by his roof.
  “I coated the roof with dedicated bituminous aluminum coating sold at a home improvement store,” says Kazmierczak. “It washed off in a few months.”
  After noticing pavers still coated with latex paint after 7 years, he decided to try latex on the roof. He mixed together 6 different colors of leftover paint and sprayed it on the roof. Seven months later, it was still there.
  “It was a good way to dispose of old paint, and it reduced my energy costs,” says Kazmierczak. “If the paint had been white or silver, the energy consumption would have changed even more.”
  To see a video of the roof being painted and how it affected roof temperature, go to FARMSHOW.COM.
  Contact: FARM SHOW Followup, Karol Kazmierczak, 713 SW 8th Ave., Hallandale, Florida 33009 (ph 305 600-0516; spam@karol.us; www.building-enclosure.com/high-albedo-roof-diy/).

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2015 - Volume #39, Issue #1