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Re: Construction method for Second Story Additions[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: <seaoc(--nospam--at)seaoc.org>
- Subject: Re: Construction method for Second Story Additions
- From: "Jeff Smith" <smthengr(--nospam--at)sirius.com>
- Date: Sat, 6 Dec 1997 12:23:57 -0800
>One of the problems we have encountered adding these second stories is that >often one has to strengthen the existing story. Some jurisdictioins do not >require this, but even when they don't I do not think it wise to put a >newer, stiffer story over an older one, especially if it has no existing >ply sheathing or other LFRS. A lot depends upon the age of the existing >structure of course; sometimes this is not a problem. >Kate O'Brien, P.E >Simi Valley, CA A building department that would allow a vertical addition without a lateral and vertical analysis of the lower levels is apparently deferring to the engineers judgement and not enforcing the code. Section 3403 of the 94 UBC is pretty clear. In San Francisco, *any* structurally connected vertical addition, short of a 150 S.F. roof penthouse, requires a seismic upgrade of the entire building, not just the areas tributary to the vertical addition. So, in SF if you are making a vertical addition you should consider maxing out the addition floor area. The UBC is a bit more flexible with the interpretation. In general, additions or alterations should not increase seismic demands or decrease seismic capacity.
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