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RE: Roof height for A-Frame

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Are you taking roof height for wind or seismic?  For wind it would be the average height, ½ way between eave and ridge.  For seismic, roof height is where the diaphragm attaches, so at the plate, top of your pony walls.  And it’s a stretch to call this a single storey...You’ve got a roof diaphragm and an upper floor diaphragm, even though for equivalent lateral force procedure your h values for each level are only separated by 18”.




Gordon Goodell



From: David Topete [mailto:d.topete73(--nospam--at)]
Sent: Monday, November 10, 2008 6:55 PM
Subject: Roof height for A-Frame


Where would the "roof height" be defined for a "single-story" structure with enough volume below the roof (12:12 pitch) that creates a second floor?  The gable ends extend to the roof ridge, while the rafters bear on a pony wall +18" above the second floor.  The second floor is 11'-0" above the ground floor.  Any thoughts would be much appreciated.  TIA.

David Topete, SE

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