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Wind Exposure D

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ASCE 7-02 says “Exposure D shall extend inland from the shoreline for a distance of 660 ft…”


IBC 2003 1609.4 says “Exposure D extends inland from the shoreline a distance of 1500 ft…”


1.  There are other nuances, but why the big difference?  I checked the errata.  I think the IBC oops’d and carried over from the UBC


2.  If the IBC references out ASCE 7 for wind load determination anyway (except simplified), why did they bother to repeat (and change) the exposures for everything?  


As you may guess, I have a building between 660 ft and 1500 ft from the shoreline.  

But it’s moot, because the surface roughness per ASCE is Surface Roughness B – there are houses and trees between the site and the beach.  So Exposure D doesn’t govern anyway.  Right?


Ed Tornberg

Tornberg Consulting, LLC