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Author:
stuckinlodi (MO)
Can you run the pex thru some type of protective hose or pvc pipe? Or put foam insulation pieces on the wall so the pex is not touching concrete?
Edited 1 times.
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Author:
North Carolina Plumber (NC)
I would feel comfortable with putting heavy roofing felt against the blocks and then attaching the pex.
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Author:
stuckinlodi (MO)
Are some types or brands of pex thicker-walled or more durable in this situation than others?
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Author:
nicholas123 (FL)
Well, I found this, but it is only 4 mil (0.004" thick. I think the pex would rub through this over time and contact the block. But, then again, it is designed to protect copper and plastic pipe buried in concrete.
I might be able to put a copper pipe strap over the pex and pipe guard, but it might be too tight and pinch the pex.
And, the oatey pipe guard is so thin that the copper strap may eventually rub through it and reach the pex.
I could hold the pex and pipe guard down with plastic hanger strap...
Or, instead of the pipe guard or roofing felt, I have some left over 40 mil (0.040 inch) thick PVC shower liner that I could drape over the wall.
Some design guidelines I believe are true. I could be wrong:
a. pex shouldn't touch block walls
b. pex thermally expands and contracts about 9 times more than copper.
c. because pex is flexible, it will buck more than copper when the water is turned on and off. Keep this in mind when pex is very close to concrete so it doesn't rub the concrete when bucking or thermally moving.
d. pex shouldn't touch metal straps and clamps.
e. pex can touch drywall
f. 1/2" tube is 5/8" wide, so if the furred gap is 3/4", I only have 1/8" clearance for insulation and strapping.
g. pex needs to be secured to the block wall...maybe not...maybe I can sandwich pex between block insulation and drywall.
You would think the plastic pipe clamps below would work, but I measured them to be 0.845" tall. The last picture shows how they compare to a 3/4" thick furring strip.
If only I had a plastic clamp that was shaped like a saddle that kept the pex 1/8" off the wall. In other words, a plastic clamp that didn't encircle the pex like the clamp above, but one that was saddle or half moon shape.
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