Advice - PEX Tubing

Old 04-21-08, 11:40 PM
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Advice - PEX Tubing

I am researching a boiler/water heater combo that heats water
for shower sink etc and also heats and pumps water through a radiant
floor heating system. I would like to avoid baseboard units in the
basement (existing slab-unfinished basement). Has anyone heard of laying down treated sleepers on the slab,
running the PEX tubing in the bays and installing plywood over that? Is
there a way to heat the basement with this radiant system of tubing and
fins without the exposed fixtures?
I found the supplies on and they have a really good deal. I just wanted to make sure that this was the best solution to my problem. Any advice is greatly appreciated!
Old 04-22-08, 08:43 AM
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Went to your link but didn't want to search through it to find what you're talking about. I can say this though - you can install a floor heating system/radiant heat on the existing slab. There are a myriad of options for that possibility that are designed for what you want to do. The ones I'm familiar with include a floor covering that incorporates specialized tubing/heating elements that are designed for the purpose. Not saying that your idea isn't designed for that - but simply that I wasn't interested in searching through your link's web site. To make a long story short - purchase a system designed to do what you want - rather than trying to rig something up because it's cheaper and "looks feasible"....
Old 04-22-08, 08:54 AM
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For My basement, I laid down foam insulation, nailed down sleepers (to use as guides), ran the tubing, then poured concrete over the tubing, using the sleepers to help me screed the concrete to the correct height. Then I tiled over everything. Wood does not conduct heat as well as tile, so I really recommend using concrete and tile. My basement went from cold and miserable to the warmest part of the house. By the way, you may need to isolate the boiler from the pex with a heat exchanger since pex can allow air to seep through and that air will rot the boiler (cast iron). You can also use pex-al-pex, which has an oxygen barrier, but i still might consider a heat exchanger since a heating buddy of mine says he has seen evidence of air diffusion even with pex-al-pex.

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