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Old Glu-Lam Combinations

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Title: Old Glu-Lam Combinations

The article referenced below is on the Structure Magazine website in their archives:



Subject: FW: Old Glu-Lam Combinations
From: "Tom Skaggs" <tom.skaggs(--nospam--at)>
To: <seaint(--nospam--at)>

FYI, hopefully those interested receive and archive "Structure Magazine".


Thomas D. Skaggs, Ph.D., P.E.=20
Senior Engineer=20
APA - The Engineered Wood Association=20
7011 S. 19th Street=20
Tacoma, WA 98466=20
ph: 253/565-6600=20
fx: 253/620-7235=20

From: Merritt Kline On Behalf Of Help
Sent: Thursday, December 29, 2005 10:34
To: Tom Skaggs
Subject: RE: Old Glu-Lam Combinations

It is hoped that Nels will locate grademarks. Without marks he will be
forced to make assumptions. In that case the folks at AITC may be able
to offer some guidance.
American Institute of Timber Construction
7012 South Revere Pkwy., #140
Englewood, CO 80112
Tel: (303) 792-9559
Fax: (303) 792-0669
Web: <>=20
In a February 2004 paper appearing in "Structure Magazine", Mr. Robert
Powell indicates that the rules for allowable glulam stresses changed in
1970 to require special tension grade laminations based on full-size
testing. Powell suggests that stresses to be used for review of old
glulam should be "the requirements of the building code in effect at the
time of the design review" not "the building code in effect at the time
of the original design."=20
This was apparently done to develop the data in Table 1 of Powel's paper
using today's technology (AITC GLVD) for determining the allowable
stress of old glulam, and today's codes for the appropriate design
loadings and load combinations for a modern technically up to date
Hope this helps, Merritt