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RE: GSBN:Re: : slab edge insulation

We've not come up with an easy and satisfactory detail for slab edge
insulation the puts the foam on the outside, for the reasons Bob
mentions--the foam has to be protected, and a termite shield is needed to
keep the critters from entering the wall from behind the foam.  If the slab
and and perimeter foundation can be separated, we have run  foam under the
slab 3-4 feet into the interior, and  turned it up between the slab and the
perimeter to make a break there.  That's relatively easy to do, and allows
the exterior to be finished simply and directly.

John Swearingen

-----Original Message-----
From: GSBN [mailto:GSBN@...]On Behalf Of Bob Bolles
Sent: Tuesday, March 04, 2003 9:11 AM
Cc: bainbrid@...
Subject: RE: GSBN:Re: : slab edge insulation

Hi John
You wrote"
>"Finally, if you are using a concrete foundation, adding a couple inches
of foam or fiber insulation to the exteiror of the foundation is
likely to be easier and high performance"

Well, therein lies the problem
If you place the foam on the exterior, first there is the appearance issue,
as well as protecting it from damage.
Then, I have to ask if this would potentially provide a path, behind the
foam or through it, for termites, ants and other little critters?

I believe that insulation under the slab is probably appropriate for cold
climates, but I am working in sunny Southern California. How much insulation
should we use, if any, below the slab.


Bob Bolles
Sustainable Building Solutions
 "They that can give up essential liberty to obtain a little temporary
safety deserve neither liberty nor safety"  Benjamin Franklin