In preparation for a big job I found some PEX on craigslist.

It appears to have been exposed to the elements but all in all it looks fine.


Can PEX withstand a little environmental conditions without loosing it's stability?

1 Answer 1


NO. PEX degrades in the presence of UV radiation. A few days exposure reduces its lifetime resistance to chlorine by 50%. Source: http://www.coengineers.com/preventable-problems-with-pex/

  • 1
    Got it. So pass on the deal? Jun 4, 2015 at 22:57
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    Unless you want to rip it out and replace it in 12-20 years, I would pass. :) Then again, there's no way to know how much UV exposure PEX you buy in a store has had anyway...
    – iLikeDirt
    Jun 4, 2015 at 23:02
  • I am doing this before I sell my house. I'll just get it at HD. Jun 4, 2015 at 23:03
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    Also, it's fine if you have a whole-house filter that removes chlorine, as that's the oxidizing element in the water that degrades PEX; the sacrificial anti-oxidants in the plastic that protect against this are themselves degraded by UV radiation!
    – iLikeDirt
    Jun 4, 2015 at 23:03
  • Cool. Yeah no filtering here. I'll just go to the big box. Jun 4, 2015 at 23:05

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