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Components and Cladding: Gable with Parapet

Components and Cladding: Gable with Parapet

Components and Cladding: Gable with Parapet

(OP)
I was looking through ASCE 7-05 at the Components and Cladding for Gable Roofs with Theta <= 7  (pg. 56, figure 6-11B).  Note 5 states the following:

Quote:


5. If a parapet equal to or higher than 3ft is provided around the perimeter of the roof with Theta <= 7, the negative values of GCp in Zone 3 shall be equal to those for Zone 2 and positive values of GCp in Zones 2 and 4 shall be set equal to those for wall Zones 4 and 5 respectively (i)n Figure 6-11A.

I understand the first comment that you use Zone 2 for Zone 3.  However, the next comment has me slightly confused.  I read it that you should take Zone 2 (on the roof) and use the value from Zone 4 (on the wall).  That makes enough sense.  But then it says to take Zone 4 (presumably on the wall?) and use Zone 5 (also on the wall?).  I would not have second guessed this except that the positive values for Zone 4 and 5 are both the same in the referenced figure.  I figured there is an error or something I am missing since they wouldn't really tell you to change it to the same value, would they?

Any guidance would be helpful.

RE: Components and Cladding: Gable with Parapet

I would think this is a typ-o and should be "Zones 2 and 3 shall be set equal to Zones 4 and 5 respectivley" - that makes more sense.

I didn't see it in the Errata though?  Unless there is a more recent errata?

http://www.seinstitute.org/pdf/erratasheet7-05.pdf
 

RE: Components and Cladding: Gable with Parapet

(OP)
Den, I agree fully.  My first thought was, as you said, a typo of "4" instead of "3", but did not see it in the errata.  

I guess I was hoping for any concrete confirmation (errata, published journal, etc) to back up what I do.  Zones 2 and 3 do make the most sense as they would correspond with the parapet wall above zones 4 and 5.  

For now I will use it in this way, but please share any other comments!

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