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Re: SIP top plate detail

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BTW, you can also do "beam pockets" in SIPs.  This can be done where the
joist/beam just sits on the skin with or without a bearing plate.  Or it
can be done such that there is a panel joint at the location and a lumber
(either 2x, multiple 2x, or engineered lumber such as PSL or LVL) post can
be placed at the panel joint to support the beam load.  The later option
is generally needed if you get significant point loads.

What I would advise against is using a face-mount hanger.  In theory, it
could work, but you would need to talk to the hanger manufacturer to see
what capacity they would "allow" for their hanger being attached to OSB
(i.e. nail embeddment of only about 7/16").  It could work if the loads
are relatively light, but the lack of nail/screw embeddment does not
inspire "warm fuzzies".

In a similar vein, I am not a big fan of ledgers to SIPs unless you can
thru bolt it.  Some will use panel screws to attach a ledger to a SIP
(that then either the joist bears on or received a hanger - face mount or
top bearing), but that does not give me "warm fuzzies".  Not to mention
you now would have a ledger that likely would "want" to be concealled in
some manner, which may not be easy to do.


Adrian, MI

On Fri, 3 Feb 2006, Joe Grill wrote:

> 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)
>  <http://inet/index.htm>

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