pex adhesive

Mitch_6 · April 2006

If I am doing a radiant floor in a bath I will run the tubing under the shower and tub.

For heat transfer to the tub I set it in mud, of course the transfer works best on a cast iron tub but the fiberglass and composite get some of the edge taken off to.

In a shower I also run tubing up the walls part of the way and under and behind the seat.

Mitch S.

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Rock Solid Restoration_3 · April 2006

pex adhesive

What is the best thing to use to adhere pex tubing to a cast iron tub? Is silicon adhesive compatable with pex? What about PL adhesive?

Thanks.

Brad White_54 · April 2006

Pure silicone is

recommended for example embedding PEX in Climate Panels. At least that was recommended about six years ago when I put mine in.

I did probably what you are doing, a couple of "victory laps" around the tub before returning to the manifold. I did not use adhesive, per se, just followed the void around the tub and sprayed urethane foam to hold it in place. Agreed, it was an afterthought in my case.

If I had my druthers I would have been more thoughtful about it than that. The way I did it does not allow air space for heat diffusion at least at the contact points (about every three feet). Could it work better? Sure. But the result is not bad. With thought the way you are going you can have a nice little radiator in there!

[Deleted User] · April 2006

If it were me...

I'd go out and buy some good extruded aluminum heat transmission plate. I'd adhese these to the side skirt, adn the side bottoms of the tub. Then, roll 1/2" PEX into the tracks and let 'er rip.

We have a friend of the company that did this in his mountain home/condo. Said it works fantastic. Installed it as a part of the circuit serving the bathroom, on the tail end. That way, the tub is never TOO hot to get into.

He also has radiant counter tops in the same condomaxium.

ME

hr · April 2006

Depending on the curves..

Mark's idea is a good one. I might be inclined to use PAP, 3/8" at that, to lessen any "pull" on the tube and/ or plates.

If it is a real curvey tub, Watts Radiant Onix is very flexible and glue-able. Heck you could wind it around like an extension cord every 6" on center if you're so inclined.

I believe construction adhesive (liquid nail)could be used with Onix for a quick set time. Check with Watts first on that glue, however.

hot rod

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Weezbo · April 2006

Craig,

are you refering to a cast iron tub with feet?

DAY 2:

i have not used any glue or silicon on pex as an adhesive,

i use some on the shower riser around the stubout more as a "cusion" and around tubes for firewall penatrations and through wall and partition plates.

here are three method i sortta fond of,one is for pex off convectors a 5'piece of fin tube... or roll a group of pex in under the tub in the slab before it is insulated to the deck and thick plates tacked to the deck with tails to tie into the radiant loop ...the best endeavour that i have seen is radiant wall ...with an Oventrop and a Japanese radiant Panel that gathers all sources of radiant and is dialable to reintroduce the heat into the room through glazing...it requires no pipes or tubes and is a "passive collector and emmitter"

Rock Solid Restoration_3 · April 2006

This is for my neighbor, actually, but no, it is not a clawfoot tub.

pex adhesive

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