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Re: underslab plumbingFrom: info@builderswebsource.com CommentsUnless your local building code prohibits its use (PEX is not approved in all localities), PEX tubing or cross-linked polyethylene is specifically designed for underslab installations since joints are eliminated (compared to copper or CPVC). In fact, PEX is commonly used for radiant heating in slabs which, by definition, is embedded in concrete. A good reference on the use of PEX is in the Journal of Light Construction. For additional information, go to http://www.wirsbo.com, which is the leading manufacturer of PEX tubing (shown below). Aquapex® is Wirsbo's tradename for its potable water tubing.
Keep in mind that PEX expands and contracts significantly (about 5%) with variations in temperature, so it's important to keep that in mind when making bends and turns. Don't pull it too tightly. The one drawback of PEX with home runs is that using a hot water recirculating pump is more expensive since every hot water faucet would require both a send and return line. Builders Websource
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As
to using a separate PVC conduit for the PEX tubing, we recommend schedule 80
which has a thicker wall and is less prone to cracking under the weight of
poured concrete. To avoid splices, use a distribution manifold and run PEX
overhead (assuming no freeze problems) where it can be replaced easily. However,
if you need to run the main line under the slab, your use of a conduit is a good
idea. We don't see any reason why this wouldn't work well, particularly if any
bends are mild.
