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Re: T1-11 siding
- To: seaint(--nospam--at)seaint.org
- Subject: Re: T1-11 siding
- From: chuck utzman <chuckuc(--nospam--at)pacbell.net>
- Date: Mon, 01 May 2006 15:05:52 -0700
It was (& still is) not uncommon to use T1-11 for
shearwalls. The capacity isn’t real
high but, if there’s enough of it, it works O.K. As for problems, do a
visual inspection & watch for decay at the horizontal edges &
nailing at the panel edges (it was fairly common to tack nail &
the lap joints with a single row of nails—basically zero capacity). But it can often be re-nailed to get what
you need. Just remember you’re nailing a strip of plywood that measures
3/8” x 3/8” (that may be Redwood) so don’t try to push the capacity too
The added weight of the stucco will require a full
& full compliance with current code. There probably aren’t any tie
strapping is often enough at upper floors.
is most likely going to be the biggest
problem. All the windows & doors
will probably need to be replaced/reset. These
little jobs can be challenging. You don’t want
to stick your neck out, but if you get too
conservative the client can’t afford to build it. If
push comes to shove, lose the stucco--I wouldn't consider it a "minor
upgrade". JLC listserver has a nice thread/photo essay on a 3 year old
stucco house that's a complete disaster due to improper waterproofing.
Chuck Utzman, P.E.
Gerard Madden, SE wrote:
I just received plans to do some minor
upgrades to an existing home.
The contractor who sent me the plans indicates that they are going to
stucco over existing T1-11 exterior siding on the upper level two
levels of the
residence as one part of the modifications. I know there are some
with T1-11 that are escaping me at this point, but IIRC, they are
likely due to
exposure to the weather. I realize that the increased weight of the
stucco (10 psf) to the walls will increase
the seismic load, but I don’t
think by that much. The home was built to the 1973 UBC.
I’m hoping someone can direct me to some
information or can share
their thoughts on:
- Shear values for T1-11
- Summary of the historic problems with T1-11
- How to visually observe if these problems are
- Suitability of placing stucco over the T1-11
I’m just in the proposal phase at this point,
have much except a few pictures and the original plans. It was 5/8”
T1-11, can’t seem to find any nail spacings