27 Feb '13, 7pm

Sealing PEX and PVC pipe penetrations #green

I am reposting this to the Code section; not getting an answer in General Questions. What do I use to meet code-required fire blocking and good weatherizing/air sealing for the circumferential individual tube/pipe and ganged tubes (a cluster of tubes), penetration gaps for PEX-to-wood (and plywood) and PEX-to-PVC pipe, and for PVC-to-wood, and PVC- & PEX-to-drywall? With manifold distribution and multiple zoning of (1) HW heating supply and return (wall hung rads), and (2) potable water supply, there are a lot of penetration points. As well, rigid PVC drain and vent pipe penetrates plates and the roof deck, passes from exterior wall cavities into conditioned spaces, all-season spigots penetrate the siding; etc. I am cautioned that PVC and PEX expand and contract such that they may tear away from foam sealants and some caulks. Also, PEX and PVC squeal and squeak, crackle an...

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