Installing PEX Under Flooring

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Installing PEX Under Flooring
For hung PEX or heat transfer plates

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When installing PEX between the joists, it becomes necessary to loop the tubing from one cavity to the next (see details below).
NOTE: Check your local code before drilling through floor joists.

This is only an example. Actual layouts vary from job to job.

Installing PEX through the joists:

Drill (2) 1-1/2” holes in each joist as shown in drawing A
Feed the tubing through the hole (furthest from the sill plate) starting that particular loop in the last joist bay. The PEX should be uncoiled off the top of the roll to avoid kinking.
The returning PEX goes through the holes closest to the sill plate.
Starting with the joist bay furthest from the manifold, grab the loop and twist 180°, then pull the loop the length of the joist bay. Fasten the end of the loop in place or let it hang. Continue to work back toward the manifold (see drawing B).
This procedure applies for all three methods of attaching the PEX (transfer plates, hung and staple-up).
Foil insulation is placed approximately 4 inches below the tubing when done.

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