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RE: GSBN:Bale to frame connection and frame height for infill construction

Hi Laura,

Thanks for your email regarding the height of the timber structure and
frame to bale connection

With infill we need the ring beam to be higher than the finished height
of the straw bale wall so that the top boxing does not get in the way of
the connection of the rafters or trusses to the ring beam. We can
achieve 7% compression with the polyester strapping with good tight
bales, so if you establish the height of your straw bale wall with the
bales relaxed and then deduct 5% you will end up with the top of the
posts and ring beam protruding above the top boxing on the straw bale
wall. The connection of the bales to the frame is done by inserting
noggings between the rafters over the top of the top boxing. These
infill blocks would extend from the top boxing to the top of the rafter,
which is secured to the top boxing with 3" nails. It can either be fixed
to the front of the top boxing or skew nailed to the top of the top
boxing. I have attached a copy of the drawing from my book, which I
trust will help to clarify my explanation.

Once the infill noggings are fixed in place, the roof sarking would be
laid over the top of the rafters and a roof batten fixed directly over
the top of the infill noggings. The sarking should extend beyond the
outer edge of the straw bale wall, so that any condensation can drop
clearly to the outside of the building. We would normally extend the
sarking to the gutter. By fitting the roof batten over the infill block
you will prevent vermin entering the roof cavity.

When rendering, we would cover the top boxing and exposed top of the
bale with render. The roof/ceiling insulation can then be positioned so
as to bridge the gap between the roof and wall top, so as to avoid a
thermal bridge.

I trust this helps, and look forward to hearing from you again shortly.


-----Original Message-----
From: GSBN [<a  target="_blank" href="mailto:GSBN@...";>mailto:GSBN@...] On Behalf Of Laura
Sent: Wednesday, 28 February 2007 6:46 AM
Subject: Re: GSBN:Compression for infill

I apologize to have begun these questions about compression and while
traveling the rest of the week, found I had no email service. You all
may have thought I just dropped off the face of the earth, but just
found myself in the snow dusted canyons of Utah while I did some work
there. Thank you all for responding. I have heard now of a variety of
systems, not all of which I have full details on, but it's starting to
be an interesting collection. I do have a few q's... Brian, how do you
deal with post height and connection with the compression using the box
beam approach? And John, in the method below for your rare infill
projects, are you compressing with your all thread approach? What does
the compression method attach to?  S'ppose any other photos might answer
much. Catherine, if you do get Brian's book in for sale, would you post
a notice for us? Again, thanks all for your thoughts and any follow up
photos. Laura

John Glassford wrote:

> G ' day Bill and Rikki
> The hole at the top or gap is dealt with in two or more ways depending

> on the deisgn of the building.  In the case of the South Coat House
> the architect designed the walls to fit below double glazed windows on

> a rake.  This worked well except for the fact that we had to make sure

> we achieved an exact height all round of 2.405 metres.  We had a
> tolerance of 5mm.  The rods achieved this and we got a 100mm
> compression from a 7 bale high wall. We were also within 5 mm all
> round after compression.
> Nikki I will send you some photos off list which will help explain.
> The other way is to build the wall to 250mm below the height of the
> top plate on the in-fill and then pre-compress 100mm or whatever the
> test wall showed prior to building, then you have a gap or hole at the

> top of 350mm which will take one bale usually forced in for a tight
> fit above the straw bale wall.  This method has worked well for us
> when we do in-fill which is rare, as we usually build load bearing
> homes.
> Kind regards
> John Glassford
> Huff 'n' Puff Constructions
> <a  target="_blank" href="http://www.glassford.com.au/";>http://www.glassford.com.au/</a>
> Mount Kilimanjaro Climb 28/8/07 <a  target="_blank" href="http://www.coolamonrotary.com/kili/";>http://www.coolamonrotary.com/kili/</a>
> 61 2 6927 6027
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