Inspection Request for PEX

Discussion in 'Plumbing Forum, Professional & DIY Advice, Tips & ' started by mbauer, May 29, 2009.

  1. mbauer

    mbauer Programmer

    Messages:
    8
    Location:
    Dallas, TX
    Inspector requesting insulation for PEX

    The inspector is requesting that I insulate my attic and outside PEX runs. He is also requesting that I fill the holes in the top plate with spray foam.

    Does anyone know if the spray foam will be a problem where it comes in contact with the PEX?

    Can I just use regular polyethylene tubing with the PEX and use metal strapping to secure it?

    I'm using Wirsbo AquaPex by the way.

    Thanks!
    Last edited: May 29, 2009
  2. kingsotall

    kingsotall Plunger/TurdPuncher

    The spray foam will be fine. But I guess a call to Uponor couldn't hurt matters.
  3. jadnashua

    jadnashua Retired Defense Industry Engineer xxx

    Messages:
    21,888
    Location:
    New England
    I'm kind of surprised he is requesting foam. I would have thought he would want fireproof caulking.
  4. 99k

    99k Radon Contractor and Water Treatment

    Messages:
    460
    Location:
    Fairfield Co.,Connecticut
    Your best to ask the manufacturer about compatibility issues. Are you sure the inspector is allowing you to use foam and not intumescent (not sure about spelling) caulk?
  5. Redwood

    Redwood Master Plumber

    Messages:
    7,453
    Location:
    Connecticut
  6. hj

    hj Moderator & Master Plumber Staff Member

    Messages:
    26,472
    Location:
    Cave Creek, Arizona
    foam

    Just regular foam here, because the wood is already flammable. Fireproofing is only for fire rated structures requiring non flammable materials.
  7. iminaquagmire

    iminaquagmire DIY Senior Member

    Messages:
    207
    Knowing the other side of things, I like fire-resistant foam. A top plate, even a single one, will burn for a good 10-15 minutes before being compromised. Can you say that for regular foam or caulking?
  8. nhmaster

    nhmaster Master Plumber

    Messages:
    3,189
    Location:
    S. Maine
    The foam is not there to stop the fire. It is there to stop the chimney effect that will draw fire into the cavity. I would bet that most PEX manufacturers would tell you not to use a urethane foam product in contact with their pipe.
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