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RE: GSBN:Re: : slab edge insulation

I agree with John Straube about not using slab insulation in SUNNY
California.  We have areas that have severe winters and deep frosts, but in
most areas we are designing for cooling loads more than heating.
Experience, as well as computer simulations, show about a 5F lowering of
ambient  temperatures for four or five summer months when slab insulation is
removed.  The corresponding increase in heating loads is usually minimal and
only significant for a couple of months.


-----Original Message-----
From: GSBN [mailto:GSBN@...]On Behalf Of John Straube
Sent: Tuesday, March 04, 2003 1:35 PM
To: 'GSBN'
Cc: bainbrid@...
Subject: RE: GSBN:Re: : slab edge insulation

I would not use any insul below slabs in sunny california, but would use
it on the stem wall.
Protection is easy -- you plaster bales? Well you can plaster the foam
too. The termites are a bigger issue, best solved IMHO with a peel and
stick over the concrete and down the face of the foam/Mineral fiber 2",
then plaster over.

-----Original Message-----
From: GSBN [mailto:GSBN@...] On Behalf Of Bob Bolles
Sent: March 4, 2003 12:11
Cc: bainbrid@...
Subject: RE: GSBN:Re: : slab edge insulation

Hi John
You wrote"
>"Finally, if you are using a concrete foundation, adding a couple
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