Originally Posted by
Scott Dana
What I find interesting is the apparent contradiction in their statements. They say PVC does not readily degrade when exposed to sunlight,
That means it is okay to expose it to sunlight during storage, transport, warehousing, and site storage without having to cover it or otherwise protect it from sunlight.
but then go on to say it should be painted if used in an outdoor application.
Because long term expose to sunlight (UV) is not good for it, UV will deteriorate the PVC.
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?
That part is answered in your other link.
Originally Posted by
Scott Dana
"When exposure in excess of two years of direct sunlight is unavoidable, PVC pipe should be covered with an opaque material while permitting adequate air circulation around the pipe. This prevents excessive heat accumulation."
Darker colors will absorb heat more, causing the PVC to heat up.