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Re: cpvc pipe insulation under slabFrom: info@builderswebsource.com
Category: Plumbing
Remote Name: 63.198.181.43
Date: 11 May 2002
Time: 12:23 PM
CommentsCompared to copper plumbing, CPVC pipe is inherently self-insulating since it is a poor conductor of heat. Using foam insulation around the CPVC under the slab probably won't hurt anything, however. Due to thermal expansion of the pipe, though, it is essential to use an insulation cushion wherever the pipe changes direction under the slab. This will help to prevent premature rupture of the pipe. According to the Plastic Pipe and Fittings Association (http://www.ppfahome.org the follow procedure is recommended: When using CPVC with joints under slab, YOU MUST PRESSURE TEST THE SYSTEM BEFORE POURING THE SLAB. Also, it is wise to use 1" foam insulation pipe sleeve at changes in direction, where the pipe comes out of the slab, and at construction joints. The pipe should be evenly supported in smooth bottom trenches. The backfill should be free of rocks and debris.
The purpose of the foam insulation is to:
Provide for a degree of movement at changes in direction due to thermal expansion.
Protect the tubing from shear forces due to minor shifts in the slab at construction joints.
Provide some protection from abuse during the construction phase for the pipe where it emerges from the slab. Longer lengths of pipe (rolled pipe) is also available for under slab installation. Follow the instructions of the manufacturer.
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