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Re: glulam shrinkage

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Thanks for the rule of thumb

John Kariotis would quote 1/28th of an inch per inch green to seasoned.    (if I'm remembering his comment correctly)


On 8/20/07, AWC Info <AWCInfo(--nospam--at)> wrote:

FYI, the rule of thumb is 1% change in dimension for every 4% change in moisture content. For the exact equation, see section M4.4 at the following link:



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 products.

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: "Thor Tandy" <vicpeng(--nospam--at)>
To: <seaint(--nospam--at)>
Subject: RE: glulam shrinkage
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FWIW there probably is change, however to date, for design purposes, = I've had no problem with ignoring changes in engineered product - they = are, after all, mainly resins ...

Thor A. Tandy P.Eng, MIStructE, Struct Eng
Victoria, BC
-----Original Message-----
From: Daryl Richardson [mailto:h.d.richardson(--nospam--at)]
Sent: Friday, August 17, 2007 6:36 PM
To: seaint(--nospam--at)
Subject: Re: glulam shrinkage

David, Robert,
Actually, a gluelam may increase or decrease in volume with = changes in moisture content. This may be affected by the relative = humidity on the environment where it is located.

Just don't ask me how much.
H. Daryl Richardson
----- Original Message -----=20
From: Robert Kazanjy=20
To: seaint(--nospam--at)
Sent: Friday, August 17, 2007 6:57 PM
Subject: Re: glulam shrinkage

Being engineered timber fab'd from KD lumber I would expect close to = no shrinkage
APA link

On 8/17/07, David Topete <dtopete(--nospam--at)> wrote:=20
How much shrinkage is expected of a glulam beam? Any ideas?=20
David A. Topete, SE=20