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Discussion Starter · #1 ·
I want to seal the holes where the pex comes from underneath the crawl space up through the floors to my fixtures. I want to stop the draft coming through.
The manufacturers instruction say to only use water soluble gypsum based caulking because others might react with the pex. I cannot find anything like that around here and people I talk to that install pex have no clue when I mention water soluble gypsum based caulking. What do people use?
 

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Assuming the holes are big enough, another option might be to get pex approved insulation that normally insulates pex tubing. Cut a piece off and jam it in the opening around the pex tubing so it extends an inch or so on both sides of the hole. It would allow the tubing to move due to expansion and contraction and prevent the tubing from scraping on the hole.

I've seen pictures where contractors used pex insulation where the pex runs through holes in wooden wall studs. It allows the tubing to move and protect it from rubbing on the wall studs.

Be sure to only use pex approved insulation to prevent deterioration of the pex tubing.

HRG
 

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Discussion Starter · #3 ·
It's half inch pex and the hole are 1,1/4" to accommodate the blue plastic pex rings to hold the pex in place I'm not sure if I could stuff the insulation in that small space.
I was td o could use silicone and others have said mono caulk from homedepot. I am not sure if any of those would be okay to use?
 
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