"RicodJour" wrote in message
...

This from the PPFA:
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.

This is spot-on for the OP's question:
http://www.plbg.com/forum/read.php?1,272730

Some PEX has UV inhibitors, some don't. There are different cross-
linking methods for PEX, and that affects water quality. There's no
simple answer other than the OP will no longer be in his house when
diffuse, filtered, UV light finally breaks down the PEX. He probably
won't even be alive!

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You're cluttering the discussion with facts. Cut it out. :-)