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Re: diaphragm chord wood roof
- To: seaint(--nospam--at)seaint.org
- Subject: Re: diaphragm chord wood roof
- From: Jnapd(--nospam--at)aol.com
- Date: Mon, 14 Jul 2008 14:00:24 EDT
In a message dated 7/14/2008 10:09:17 A.M. Pacific Daylight Time,
Madden, SE wrote:
> Yes, the coil strapping is the
tension element and is placed over the
> wall sheathing into your
blocking at the top chord between trusses.
> The chord force will be
highest at the middle of the diaphragm span as
> you know, so you can
skinny it down quickly from the 8 kips you
> mentioned. You may need
two straps for that region where the force is
> high. Consider using
4x10 blocking with the depth running vertical to
> give you a wide
enough surface to nail your straps into.
4x10 is running horizontally (3 1/2" deep by 9 1/4" wide), then
straps can be run continuous away from the upright member for
parapet. There will be 3 3/4" from the inner face of the vertical
2x6 to the edge of the 4x10. Should be enough room for a wide coil strap
or 2 narrow ones
The strap is usually placed on the out side of the plywood that is on
the vertical face of the trusses. It is nailed to the 3 1/2" edge of the blocks.
The way you described the nails would have a dual purpose (Boundary
nailing and strap connection).
Johnson & Nielsen Associates