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Re: wind and drift[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: seaint(--nospam--at)seaint.org
- Subject: Re: wind and drift
- From: Jnapd(--nospam--at)aol.com
- Date: Thu, 5 Nov 2009 14:55:06 EST
As Harold indicated all the PEMB projects I have been involved with the initial design was for h/20. I explain to the clients that because of the h/20 design criteria within 5 years your building will leak water for sure and probably air also. I suggest that the deflection lint be change to h/200 the is happier but the PEMB supplier claims the price has now increased $10 -15,000 because of the more restrictive requirement.
Johnson & Nielsen Associates
Palm Springs, CA
In a message dated 11/5/2009 5:58:00 A.M. Pacific Standard Time, akester(--nospam--at)cfl.rr.com writes:
Well put as always Harold. And specifically on the subject of masonry and PEMB I believe ACI 530 has some guidelines or reccs on drift for CMU, I don't have it handy to check. But when you are the "EOR" on a PEMB project, designing the foundations, slab, and CMU cladding, pay careful attention during the preliminary design phase to let the owner/architect/GC all know that you have specific drift limits for the frames because of your CMU cladding, which may in turn effect overall cost of the PEMB significantly. The PEMB "sales guy" may sell a very cheap, basic PEMB package with metal siding that as Harold said can tolerate some high drift limits. Your CMU most likely cannot. If you have partial height CMU that will be supported by one of the PEMB wind girts, make sure you put connection details and a deflection limit for that member clearly on your drawings and insist the PEMB see these drawings prior to their design.
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