no insulation under radiant floor

Ted_9

What about having the in sulation company drill small holes in the subfloor and use some kind of spray insulation?

I know you thought of this, but is it a money thing?

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GW

no insulation under radiant floor

Hello,

I have a job where the owner want to have a radiant floor heating system installed, Climate Panel. It's a non-typical construction arrangement; the floor is framed but there is no access to get some insulation installed. It's like the floor was framed on top of the slab.

I realize significant heat would be lost downward, but I'm presuming that the water temp could be elevated to get the floor up to 85*. How much temperature can the wood take? Should I NOT do this job? I know the floor heat will still work; I have radiant at my house; I ran the system for several weeks before I insulated. Obviously the basement was much warmer because of the heat loss downward but it still worked.


Thanks for any help,
Gary

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Rodney Summers

Climate Panel down already?

If not, why couldn't you install some foil backed insulation over the subflooring first?

Unknown

what does the heat load calc show? You don't know it will still work until you have the calcs that confirm it. Downward loss bleeds a lot of heat you might actually need topside...

Normally for contractors I would say a prefab panel is a good choice, but in this case I would do a sandwich install to get another layer of plywood between aluminum and the downside, at least, if you're going to do the project, and be sure to use PEX-AL-PEX if you do. The heat bleed to below makes expansion/contraction issues much worse.