RE: GBlist: Re: Durisol walls for a basement?

["J. F. Straube" <jfstraube@uwaterloo.ca>]

The difference between surface bonded masonry and Durisol are important.
The shear between the skins that develops as a result of bending will cause
creep in the Durisol and will not have much effect on a concrete block.
Secondly, I am a bit concenred about ductility.  I have tested a
surfacebonded wall using the normal glass fibre reinforced mix.  It results
in a stiff and strong wall until the skin cracks, and then the whole thing
falls apart.  For this reason the Durisol surface bonding system uses metal
reinfocing mesh (which has a nice slow failure and greater strength)
If there is enough vertical load on the wall, then you need not worry as
much, but that comes from certain types of buildings only, eg log homes,
cordwood, heavy timber etc.  This would require an engineered solution.
Also remember that foundation loads vary significantly throughout North
America.  In some soil types the lateral load will be 1/5 that of others.
In many cases, the lateral load never reaches the design load so a very
large safety factor remains.  But, basments are too important for most
people to play fast a loose with.

---------------------------------------
John Straube
Civ Eng Dept and School of Architecture
University of Waterloo
T: 519 888 4015
F: 519 888 6197

-----Original Message-----
From: owner-greenbuilding@crest.org
[mailto:owner-greenbuilding@crest.org]On Behalf Of GrenSheltr@aol.com
Sent: Thursday, January 27, 2000 7:30 AM
To: greenbuilding@crest.org
Subject: GBlist: Re: Durisol walls for a basement?


In a message dated 1/26/00 9:19:02 PM Eastern Standard Time,
jfstraube@uwaterloo.ca writes:

<< I would not recommend sirface-bonded durisol (or stess skinned panels of
any
 sort other than metal faced) for long-term high loads.  Long term high
loads
 exist in full basements. >>

interesting - I believe that Rob Roy recommends surface bonded block for his
underground/cordwood masonry houses          Linda Lloyd
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