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Re: External DWV need UV protection?
FWIW, The Plastic Pipe And Fittings Association says:
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.
<http://www.ppfahome.org/pvc/faqpvc.html>
That said, I've never actually seen PVC pipe degraded by UV, nor have I talked to anyone who has.
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