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Re: SIP top plate detail

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Hi Scott
I recently did a SIP house in California in Seismic Zone 4 with a 95 psf snow load. The holddowns I used were the simpson ATS system along with custom splines. Premier Panels had a design for the splines 2 pieses of LVL 2x8 with a foam inside that has a 1.5" dia hole for the all thread rod. ( the hole they core in the foam is the same as for the electrical) I used a steel bearing plate washers on the top plates( 2 -2x8 top plates with a 1.125" bearing plate on top of that ) I found that simpson has larger width bearing plates available but not listed in the catalogs. This way the holddown system has its bearing plates and rod to rod connections (coupler nuts) in the floor systems. I didn't use TUDS because the wall and floor is mostly Engineered lumber. It seems that Premier was some what secretive and didn't provide details on this. I found out about this from a consulting engineer they refered me to when the couldn't answer my techinical questions about SIPS. But once specified on the plans the said we'll build what you drew. I still think the sales guy is sorta clueless on the system but wanted a sale. ( we went with premeir because of the loads available for the shear walls in the ICC report) I found if you have technical questions on SIPS ---Todd from R-Control is the main PHd PE behind testing and design.

Tim Rudolph

From: Scott Maxwell <smaxwell(--nospam--at)>
To: seaint(--nospam--at)
Subject: Re: SIP top plate detail


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

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