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RE: GSBN:Compression for infill
- To: "'GSBN'" GSBN@...
- Subject: RE: GSBN:Compression for infill
- From: "Brian Hodge - Anvill" brian@...
- Date: Wed, 21 Feb 2007 12:55:35 +1100
- Reply-to: "GSBN" GSBN@...
- Sender: "GSBN" GSBN@...
We have been using a 19mm (3/4 ") flat polyester strapping which has a
1,100 kg breaking strain. We fit them every 450mm (18") along the wall.
We fit an extra heavy duty metal buckle to both sides of the wall.
We have been able to consistently gain 7% compression by compressing 3
times with 24 hours between each compression. As a consequence of the
rigidity of the wall following this compression we have been able to
negate the need for any bracing of the substructure.
We use a 450mm wide bottom boxing standing 90mm high, filled with clean
crushed rock. The top boxing is made up of 3 pieces of 90x45 plantation
pine. 2 pieces vertical with the third horizontal between and at the
bottom of the two vertical pieces, thereby forming a U shape. This gives
a top boxing of 180mm in width. This I believe also contributes to the
stability of the wall, as we gain significant triangulation as a result.
All of this information is in my book "Building Your Straw Bale Home-
from foundations to the roof" published by Landlinks press ( a division
of CSIRO Publishing in Australia.
We have also been able to reduce the size of the posts supporting the
top ring beam, as the bales are tightly packed in around the posts,
thereby providing lateral stability to the posts resulting in a
lessening of the risk of bowing under pressure.
I trust this is of help.
Straw Bale Building Consultants
From: GSBN [<a target="_blank" href="mailto:GSBN@...">mailto:GSBN@...] On Behalf Of Laura
Sent: Wednesday, 21 February 2007 9:09 AM
Subject: GSBN:Compression for infill
Questions have come up with two clients of mine in the same week wanting
to explore various options for compression of bales in a post and beam
system. I see it as a valuable step in reducing gaps and possible
resultant airflow or reduction in R-value, as well as creating a stiffer
wall. I don't have alot of hands-on experience with this other than
levering down the 2nd to last course and would be interested to hear
folks thoughts on the value of this as well as preferred systems. I did
a search of older GSBN messages, and found some interesting comments but
would appreciate current comments and experiences. Thanks, Laura Bartels