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Re: ASCE/SEI 7-05

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The Guide to the Use of the Wind Load Provisions of ASCE 7-02 takes 'a' as from the edge of the overhang for the roof.
On 2/14/07, Jordan Truesdell, PE <seaint1(--nospam--at)> wrote:
I have always presumed that a is based on the portion of the building being examined (roof is measured form the eave, not the edge of the building). The only backup I have for this is Figure 6-11(B/C/D) in the Method 2 charts, p56-58, where the elevation clearly shows an overhang, and the plan views illustrate a from the corners of the (roof) plan, not the corners of the (hidden, unillustrated) building below.  That's pretty thin evidence, though it does illustrate the a dimension on the roof. You might have to look at the references in the commentary to determine the original research findings for roof load data.

M. David Finley, P.E., P.A. wrote:
I'm trying to find a definitive answer within ASCE/SEI 7-05 to this question, but so far have not:
A single story rectangular building with an small (3'-0" or so) overhang.  Gable Roof with less than 7 degree slope.
For the walls, dimension "a" is measured from the ends of the walls - no problem.
But for the roof, is Dimension "a" also measured from the ends of the wall?  Or is it measured from the edge of the roof?
David Finley
M. David Finley, P.E., P.A.
2086 SW Main Boulevard - Suite 111
Lake City, FL  32025
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