Thread: External DWV need UV protection?
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Old 10-24-2008, 08:03 AM
Scott Dana Scott Dana is offline
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Join Date: Mar 2007
Location: Roswell, GA
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Re: External DWV need UV protection?
Quote:
Originally Posted by Michael Thomas View Post

Can PVC pipe be exposed to the sun?

PVC does not readily degrade when exposed to sunlight (ultraviolet radiation) due to natural UV inhibitors present in the material. Short-term exposure to sunlight, such as during construction, is typically not a problem for PVC pipe. PVC piping may be used in outdoor applications when the piping system is painted with a light-colored water based acrylic or latex paint that is chemically compatible with PVC. When painted, the effects of UV exposure are significantly reduced.

What I find interesting is the apparent contradiction in their statements. They say PVC does not readily degrade when exposed to sunlight, but then go on to say it should be painted if used in an outdoor application. Also, they say to use a light colored paint, whereas it's normally painted with a black to match the roof. Wondering if the color really matters or not. Thoughts?
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Dana Home Inspections, Inc.
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