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Glulam Design Source

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Our Wind & Seismic Supplement covers diaphragm capacities for both wood
decking and plywood over wood decking:



John "Buddy" Showalter, P.E. 
Director, Technical Media 
AF&PA/American Wood Council 
1111 19th Street, NW, Suite 800 
Washington, DC 20036 
P: 202-463-2769 
F: 202-463-2791 

The American Wood Council (AWC) is the wood products division of the
American Forest & Paper Association (AF&PA). AWC develops internationally
recognized standards for wood design and construction. Its efforts with
building codes and standards, engineering and research, and technology
transfer ensure proper application for engineered and traditional wood

The guidance provided herein is not a formal interpretation of any AF&PA
standard.  Interpretations of AF&PA standards are only available through a
formal process outlined in AF&PA's standards development procedures.


From: "Rich Lewis" <seaint04(--nospam--at)>
To: <seaint(--nospam--at)>
Subject: Glulam Design Source

I'm considering reroofing a building enclosing a pool using glulam
construction. I would use glulam purlins and wood decking. I would leave the
5 existing main steel girders as they are in fair condition. A good cleaning
and painting should extend their life quite a bit. I assume glulam decking
would be cheaper than solid sawn lumber decking. Can anyone tell me if that
is a correct assumption? I also assume there must be a way of creating some
diaphragm action in wood decking. I haven't found any information on this in
my wood design references. Is it possible to create a diaphragm with some
kind of side lap nailing pattern, or do I need to put plywood sheathing on
top of the wood decking?
I'm wondering what the best reference is for glulam design. I know the NDS
covers glulam. It doesn't specifically address decking members but I could
work out the numbers on it manually. I'm wondering if the AITC Timber
Construction Manual was worth purchasing for the glulam information. Has
anyone found this to be a helpful reference for glulam design? Does it
discuss diaphragm action of a wood deck roof? I looked at AITC's web site
for their free literature and didn't find anything addressing diaphragm
action. Are there any other references that would be better?
Thanks for your help.

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