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Building area calculations - IBC

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ATSE

ATSE

Structural
May 14, 2009
594
When calculating building areas for mixed use and occupancy, are demising walls split between the two areas?
That is, if you have a CMU rectangular building with a CMU wall dividing an office area (B occupancy) from an automotive repair shop (F-1 occupancy), does the area of the shop include all of the shop exterior wall and 1/2 of the interior dividing wall (4" of CMU wall width x the length of the wall)?
 
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That's how I have generally handled it...
 
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Which edition of the code? The method between the 2006 and 2009 IBC bounces around like a bee bee in a box car.

And a demising wall (at least how I define them) can't be used as means of separating an occupancy.
 
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2009 IBC is the basis for design.
Demising wall was the incorrect term. Thanks for the correction.
 
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