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When investigating a leak, I noticed that my roof vents are just white PVC stubbed up though the roof.

Is this considered OK? I thought white plumbing PVC brittled in UV light
 

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Some PVC gets brittle and yellows in sunlight and in cold. I have read here that plumbing PVC is more UV resistant than the stuff I use for vac lines. Check the stamping on the pipe, then google it or post it here.
 

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The vent piping is the same pipe throughout your house. It has been approved for vent/exposed usage.
 
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