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Re: SIP top plate detail

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Is you company working on more "SIP" friendly higher capacity (i.e. anchor
bolt style) hold-downs?  Your PHD and TDX style hold-down (as well as
similar hold-downs from other manufacturers) can work, but are a challenge
to work with when doing SIPs.  They kind of create a nice non-insulation
"void" in the SIP and they can then also act as a thermal break (i.e. a
big hunk of metal in within the panel).  The biggest issue is that they
are a challenge to use/install as one does not have easy access to the
hold-down like one would have with a stick-framed wall.

The reason that I ask is that we are looking for a better solution since
we are starting to get more and more projects in areas with high seismic
(i.e. California) and high wind (East Coast hurricane zone).  These areas
usually end up with some SIP shearwalls with rather significant
overturning forces that exceed strap style hold-downs (i.e. your STAD
hold-down) capacities.


Adrian, MI

On Fri, 3 Feb 2006 coengineer(--nospam--at) wrote:

> USP Structural Connectors has a SIP Connection Manual at:
> that shows the hangar bearing on the skin.  Todd Grevious at USP did some of the work on this.  You can reach him at (800) 328-5934 if you have any questions.
> Thanks,
> Howard Silverman, PE
> Covert Operations/USP Structural Connectors
> Signal Hill, CA
> hsilverman(--nospam--at)
> (562) 986-4212
> -----Original Message-----
> From: Joe Grill <jgrill(--nospam--at)>
> To: 'seaint' <seaint(--nospam--at)>
> Sent: Fri, 3 Feb 2006 16:27:01 -0700
> Subject: SIP top plate detail
> I am trying to put together a detail on a project using SIP ("structural insulated panels") those pesky things with a foam core and plywood skins.  I have joists framing into the SIP wall from both sides, but at different elevations.  The roof slopes on either side of the wall are different and are parallel to the wall length.  I was initially thinking about just hanging the lower joist off the side of the panel with a top flange joist hanger.  In that detail the hanger would be set out from the 2x top plate " due to the plywood skin.  I called Simpson to see what they thought about that, but have not yet received a reply.  Basically, the top flange of the hanger would be on the 2x plate and a portion, ", would be on the plywood skin.  I then thought that maybe I could use 2 plates where the top plate would be " wider than the bottom, therefore the joist hanger would be hanging at the edge of the plate which would be flush with the plywood skin.  But, there would be, possibly, a " cantilever of the top plate, but on the other hand may possibly be supported by the " plywood skin below.  This option seems workable, assuming the plywood skin will support the " overhanging plate.  Am I missing something, or does anyone think that the detail is o.k.  I seem to recall (I think it was Bill Allen) some time back that was looking at a detail with a similare overhanging plate, but if I remember correctly, there was no plywood skin present, or maybe there was.   Is a " cantilever at the top plate no big deal if we consider that the plywood skin will not support the edge of the top plate?  The reaction on the joist hanger is about 370# of which about 60% is snow load.
> Any ideas?
> Thanks,
> Joe Grill
> Joseph R. Grill, P.E. (Structural)
> Shephard - Wesnitzer, Inc.
> Civil Engineering and Surveying
> P.O. Box 3924
> Sedona, AZ  86340
> PHONE (928) 282-1061
> FAX (928) 282-2058
> jgrill(--nospam--at)

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