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Re: Mat Foundation with Hydronic Heating System

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        You might also recommend using headers on opposite sides with a number of parallel heating lines between as opposed to one long continuous line zig-zagging through the system.  That way if there is a problem with the system one line could be disconnected as opposed to ripping out the whole system.
H. Daryl Richardson
----- Original Message -----
Sent: Sunday, January 30, 2011 9:50 AM
Subject: Re: Mat Foundation with Hydronic Heating System

Put a thermal barrier (styrofoam) and topping slab. Total assembly is usually about 4 inches.

Putting it in the mat makes it very inefficient as now a larger mass must be heated (even when placed at the top).


On Sun, Jan 30, 2011 at 5:40 AM, David L. Fisher SE PE <dfisher(--nospam--at)> wrote:

I agree with your gut...if there is ever a problem with the system, it needs to
be at least somewhat accessible...I'd even provide a membrane between the
structural slab and the topping for future removal (if necessary) and to somewhat 
limit the thermal stresses in the mat.

On Sat, 29 Jan 2011 21:08:42 +0000, mblangy(--nospam--at) wrote:
Greetings list,
My client would like a hydronic heating system (3/4" Pex @ 12" E/W) to be incorporated into the 12" mat slab foundation specified for their residence. I am considering placing the tubing just below the top layer of slab rebar, but my gut tells me it needs to be in a separate topping slab. Any advice would be greatly appreciated.
Michel Blangy, P.E.
Hermosa Beac, CA