radiant over slab

Joey B

I read in this months PM about installing radiant over an existing slab. Is insulation ie double bubble, nessesary over existing slab in a basement before laying tubing and new concrete?

kevin coppinger_4

don't waste...

your money w/ bubble foil insulation/crap...it is not the way to go, it has no r-value!....use styrofoam...

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hot_rod

Is there

insulation under the current slab? It sure would be nice to get a thermal break somewhere in the build up. I'd feel more comfortable with 1/2 or 3/4" EPS boards to bubble. It is designed for this purpose has true r-value and weight bearing ratings,

I'd also put an insulation band around the edge for a thermal break and expansion.

hot rod

Paul_11

I agree with you Hot Rod, 1/2" or 3/4" EPS is better than bubble wrap when you can handle the height.

Would you also use EPS under radiant floor pours, slab on grade, rather than Styrofoam if height was no issue.


Respectfully,

Paul B. Shay
pshay@arealgoodplumber.com
LMP 1307
LMFS 654B
OUR MISSION: TO PROVIDE WORLD CLASS PLUMBING, HEATING, AND SPRINKLER SERVICE TO EACH AND EVERY CLIENT WE SERVE, FAR EXCEEDING THEIR HIGHEST EXPECTATIONS!

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Glenn Sossin_2

AGREE

100% Use some type of foam insulation to minimize downward heat energy losses - actually very important to insulate the edges also - depending on the depth of slab to grade, the edges can lose as much as the underside of the slab.

Our customers have been very happy using a product called the barrier. Think of the foam coffee cup you get at McDonalds, Burger King, - it's very thin, yet hardly any heat energy comes through to your fingers.
Check out the attacments. This should help you.