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Re: Delaminating glulam valley beam

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Most of the reported delamination of glulam beams is really seasoning
checks. I have been out on several jobsites in the last few months and 99%
is checking.

I would be glad to assist you by reviewing the photos.

You can obtain additional information regarding checking from AITC and APA.
Both organizations have technical notes that address checking. APA's tech
note is available online for free.

You may contact me at

Bruce Pooley
Timber Design
3448 South Newland Court
Lakewood, CO 80227
----- Original Message -----
From: "Peter McCormack" <PMac(--nospam--at)>
To: <seaint(--nospam--at)>
Cc: <aec-residential(--nospam--at)>
Sent: Thursday, November 30, 2000 6:22 AM
Subject: Delaminating glulam valley beam

I have received a report of a valley beam delaminating at the
second lamination from the bottom. The beam is a 5 /18" x 12"
(24F-V4) and from my calcs is structurally adequate. The other
valley beam is fine.

I am trying to determine the cause of delamination. I have doubts
about it being poor manufacture.  I am still obtaining information
regarding storage prior to construction, if the beam was left
exposed to the elements for any length of time etc.

The building was constructed during the fall of last year and
complete this spring. The building is located in NY. I am relying on
2nd hand information in getting the facts i.e. I have not seen the
problem personally).

Any comments appreciated. I have some jpeg files showing the
problem if anyone is interested which I will post directly(the seaint
listserver will not accept a email if it is to large)