26 Feb '13, 6pm

Green Building Q&A: air sealing and fire blocking PEX and PVC penetrations

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 in my walls, partitions, floors and ceilings. 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. These materials are oxygen barrier PEX, and Red and Blue PEX, and PVC; passing through drywall, plywood, dimensional lumber. PVC and PEX expand and contract, tearing away from sealants and foams. They squ...

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