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RE: wood defects - how much is too much

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If the lumber seems to meet your grade requirement, the grade requirement must be in the contract documents.  You need to get a copy of the grading rules cited in the contract documents – they define acceptable defects for each grade of lumber.  The grading rules can be used to determine whether the grade stamp on the lumber reflects the actual quality of the lumber.


Nels Roselund, SE

South San Gabriel, CA


From: engineer101(--nospam--at) [mailto:engineer101(--nospam--at)]
Sent: Wednesday, March 30, 2005 9:00 AM
To: seaint(--nospam--at)
Subject: wood defects - how much is too much


can anyone give me a reference standard for wood defects? I would like to know what the tolerances are for excessing checking, warping and cracking of structural timber. I am having challenges rejecting defective timber on a project. The timber meets our grade requirements, it's just that it is excessively checking and knotty and is unacceptable to us.