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Re: Mat Foundation with Hydronic Heating System

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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).

-gm

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




On Sat, 29 Jan 2011 21:08:42 +0000, mblangy(--nospam--at)satco-inc.com 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