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Air seal and fire block PEX and PVC penetrations

oakoak Member Posts: 21
They say, keep Great Stuff and other volatile caulks and foams away form PEX. I need something to air seal and fire block the many PEX and PVC pipe/tube penetrations from my mechanical room throughout the house. The plumbing pipes, potable water and heating PEX are bridging conditioned and unconditioned spaces so I need the air sealing feature most.

Please advise on affordable fireblocking sealants (tubes or puttys) that are safe with PEX and PVC.


  • SWEISWEI Member Posts: 7,356
    quite a few

    of the fire caluks are rated as PVC safe.  PEX is far less sensitive to solvents than PVC.
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