[QUOTE=pete3799;4897615]
This is the first i've heard of depth variances effecting heat transfer. I was under the impression that the whole slab just absorbed the heat and radiated it up. Very interesting.
it was news to me also. I know a few people who put radiant floor heat in either a few rooms or the whole house and didn't like it. Seems I now know thw reason why.
My concrete contractor just hooked the rebar mesh with a rake and picked it up as they poured.
------ The original plan was to do same as you and let it fall on these 2.5' long x 1" high chairs/wire spacers to keep it off the very bottom. The concrete guys just finished installing 3" high risers. Do you know how high your tubes are into the slab? I guess you read the site info?
Here's the company i bought my system from
www.radiantcompany.com
Maybe they could steer you in the right direction.
thx
Wish i could be of more help, but i will tell you, you'll LOVE radiant heat.
Thx for encouragement. Right now I need it. I'm not sure if it's more work for a contractor to deal with a 911 weekend wrench or for the 911 guy to deal with a contractor?