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RE: Seismic Loads in Ceiling

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Title: RE: Seismic Loads in Ceiling
Bill,

How about sheathing the loft/attic floor with plywood to say 24" short of the exterior wall, and then
sheathing the remaining 24" strip on the underside of the joists

Tarek Mokhtar, SE
Laguna Beach, Ca



Sure, but it's another layer of sheathing.
 
 
T. William (Bill) Allen, S.E.
ALLEN DESIGNS
Consulting Structural Engineers
 
V (949) 248-8588 * F(949) 209-2509
-----Original Message-----
From: Jason Christensen [mailto:jason(--nospam--at)wcaeng.com]
Sent: Monday, December 22, 2008 10:03 AM
To: seaint(--nospam--at)seaint.org
Subject: RE: Seismic Loads in Ceiling
 
Could you use a 3/8 sheathing under the GWB ceiling?
 
Jason
 
WCA Structural Engineering, Inc.
-----Original Message-----
From: Jnapd(--nospam--at)aol.com [mailto:Jnapd(--nospam--at)aol.com]
Sent: Monday, December 22, 2008 8:53 AM
To: seaint(--nospam--at)seaint.org
Subject: Re: Seismic Loads in Ceiling
 
Bill
Can you treat this area as a loft ?
 
In a message dated 12/22/2008 8:48:20 A.M. Pacific Standard Time, t.w.allen(--nospam--at)cox.net writes:
Just curious, but I'm interested in how others address transferring the ceiling dead load to lateral force resisting elements in residential construction. I haven't worried about this too much in the past, but I have a project now which consists of a high pitched roof and the owner wants to use the attic space as a floor. Of course, the problem is that I can't connect the floor diaphragm to the top plate of the exterior wall because the roof rafters are in the way. I can't use the ceiling joists in weak axis bending because they do not clear span the structure. Besides, they only run one direction. I'm concerned about using the GWB ceiling as a diaphragm because of what it may do to my R value and that I have a low level of confidence in quality of construction with regards to the installation of drywall fasteners. I have visualized all sorts of complicated (and convoluted) shear transfer details which I would rather not draw nor present to the architect.
 
TIA,
 
 
T. William (Bill) Allen, S.E.
ALLEN DESIGNS
Consulting Structural Engineers
 
V (949) 248-8588 * F(949) 209-2509
 
 

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