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Re: T1-11 siding

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I was taught to the values for 3/8" plywood when T1-11 is used to account for
the grooves.  APA has a technical bulletin (TT-018) on their website covering
weathering effects on plywood siding.

Gary Grinstead, SE

Quoting "Gerard Madden, SE" <gmadden(--nospam--at)>:

> 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 place
> 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
> drawbacks 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 present
> *	Suitability of placing stucco over the T1-11
> I'm just in the proposal phase at this point, and don't have much except
> a few pictures and the original plans. It was 5/8" T1-11, can't seem to
> find any nail spacings on the drawings.
> TIA,
> -gm

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