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Re: Roof Sheathing at Ridges - Max. pitch for effective diaph.

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I recommend the sheathing you have planned. With an attic that large you
can predict that they will want to store stuff or use it as a room in the
future- thus requiring sheathing.

Stan Scholl, P.E.
Laguna Beach, CA

On Wed, 07 Aug 2002 18:02:34 -0700 John Rose <jrose36(--nospam--at)earthlink.net>
writes:
> Mark, I don't recall that there is any limit to roof pitch for sloped
> diaphragms.  But, just to make sure, I suggest that you contact 
> APA's Help Desk
> (help(--nospam--at)apawood.org) to have someone look up the information on folded 
> plate roofs
> (there is an APA report on the design method) for any discussion of 
> roof
> slopes.  Of course, the wind forces on a structure, and wind uplift 
> forces on
> the roof framing and sheathing, with high pitched roof probably 
> would be greater
> -- refer to ASCE 7 for analysis.  Also, diaphragm forces could also 
> be higher.
> John Rose
> APA (Retired)
> Tacoma, WA
> 
> Mark Baker wrote:
> 
> > As long as were on this topic....is there a maximum pitch at which 
> the
> > diaphragm is no longer effective?
> >
> > We're about to start a project, 3 story custom residence with an 
> 8:12 pitch.
> > On similar projects in the past (steep roof pitch) I have sheathed 
> the attic
> > floor in it's entirety due to my concern of the steep roof pitch 
> degrading
> > the diaphragm performance at roof level.
> >
> > Any comments?
> >
> > Regards,
> > Mark
> >
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