PEX and spray polyurethane foam...

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by mikepdaviskc, Jan 15, 2007.

  1. mikepdaviskc

    mikepdaviskc New Member

    Aug 25, 2005
    I like to use Polyurethane foam (Great Stuff, etc.) to fill pipe penetrations. Is there any reason to be concerned about it damaging PEX while it cures. There are warnings on PEX about contact with chemicals. I've googled this and not found any warnings but I would appreciate it if someone who has seen PEX in contact with foam with no problems give me the OK.

  2. Randyj

    Randyj Master Plumber

    Nov 25, 2006
    Pex is known and formulated for its chemical stability. If you're worried about it then just wrap it with a walmart bag or tape or even aluminum foil...then squirt in the great stuff.
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  4. tviapiano

    tviapiano New Member

    May 10, 2005
    Ask DOW

    Try sending a message to DOW with your question:

    Go to "Contact Us" and there is a form you can fill out and ask a question.

    I recently submitted a question asking if it was recommended to use greatstuff to fill the gaps in hydronic heat pipe penetrations, and they got back to me in a day or two - and said it was fine as long as the temp was under, I think, 240 F.
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