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Re: R values for vertical combinations exceptions

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IIRC, the SEAOC Blue Book had commentary/language that a designer can reasonably argue the moment frame design force based on a lower R while the balance of the structure is designed for the higher R value for shetthed wood walls.  Most building departments have accepted this argument before.

As for the rowhouse, if 3 stories tall, I don't think a moment frame or wood shearwall building would meet the building separation requirements at 1".  Good luck.

On Thu, Oct 2, 2008 at 8:59 AM, Jeff Smith <jeffsmith7(--nospam--at)> wrote:
I am looking at the exceptions to section page 122 ASCE 7-05 Exception 3
Does exception 3 mean that for a typical wood framed three story single family dwelling with a moment frame at only the garage, the building be designed for an R of 6.5 and design just the moment frame for 3.5?
Is a zero set back row house considered a "detached" dwelling, (1" between buildings)?

David Topete, SE