Could you use a sanded plywood without the GWB, then mud, tape and texture. Not sure if you can mud and tape plywood though.
Jason
WCA Structural Engineering, Inc.
From: Bill Allen [mailto:t.w.allen@cox.net]
Sent: Monday, December 22, 2008 11:08 AM
To: seaint@seaint.org
Subject: RE: Seismic Loads in Ceiling
Sure, but it's another layer of sheathing.
T. William (Bill) Allen, S.E.
Consulting Structural Engineers
V (949) 248-8588 • F(949) 209-2509
-----Original Message-----
From: Jason Christensen [mailto:jason@wcaeng.com]
Sent: Monday, December 22, 2008 10:03 AM
To: seaint@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@aol.com [mailto:Jnapd@aol.com]
Sent: Monday, December 22, 2008 8:53 AM
To: seaint@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@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.
Consulting Structural Engineers
V (949) 248-8588 • F(949) 209-2509
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