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RE: GSBN:Re: : slab edge insulation

It will definitely suck up moisture, and so must be protected from
direct prolonged water contact.  If it is justbe used near the slab
edge, then no worries.  I would also think that one could cast in a
block of the stuff just like you would a layer of foam plastic or rigid
insulation -- this provides a break in the middle of the concrete along
the top 1 or 2 ft.

Finally, if you are using a concrete foundation, adding a couple inches
of foam or fiber insulation to the exteiror of the foundation is
likelyto be easier and high performance

John Straube
Dept of Civil Engineering and School of Architecture
University of Waterloo
Waterloo, Canada

-----Original Message-----
From: GSBN [mailto:GSBN@...] On Behalf Of Rob Tom
Sent: March 4, 2003 10:55
To: GSBN@...
Cc: bainbrid@...
Subject: GSBN:Re: : slab edge insulation


I've never used the perlite/cement mix of which you speak but I do
how well the material drains since it is presumably being used at/below 
grade where it is likely to suck up ground moisture quite readily (and
compromise its value as insulation) due to the large percentage of void
the low-density material ?

(ie Expanded perlite is highly absorptive (2-90% by volume) and quite 
vapour-permeable (32 perms)...don't know what the properties are when 
combined with cement)

  --- * ---
Robert W. Tom
Kanata, Ontario, Canada

please visit:  http://www.theHungerSite.com daily

Date: 3 Mar 2003 13:07:55 -0600
From: bainbridge bainbrid@...

>foamed concrete insulation

>Perlite concrete can be made with a dry density of 20 lb/ft3(320
kg/m3) The lower the density, the higher the insulating value.

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