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RE: Seismic Loads in Ceiling

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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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