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Re: [SEAOC] Stresses for incised preservative-treated wood

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From:          GCHOCK(--nospam--at)
Date:          Tue, 2 Apr 1996 14:35:50 -0500
To:            seaoc(--nospam--at)
Subject:       [SEAOC] Stresses for incised preservative-treated wood
Reply-to:      seaoc(--nospam--at)

You  may want to refer to the following publication:
Lam, F. and P. Morris.  Effect of double-density incising on bending 
strength of lumber.  Forest Products Journal. 41(9):43-47.

The City of Honolulu is proposing a code amendment to UBC section 2304.3.2
which would require consideration of the effects of incision on the strength
of wood, and to Section 2317.5 to require that all unexposed Douglas-fir and
Hem-fir with more than one inch thickness be incised to 0.3-inch depth.  

Incision is done with some termite treatments to achieve greater penetration
into the member, and the Structural Engineers Associaton of Hawaii is aware
that the Canadian Standards Association CAN3-086-M84 specifies an allowable
stress adjustment factor Kt which varies from .70 to .85. 

However, we do not know of any U.S. standard or guideline/research on this
issue.  Would any of you be able to provide any further information or leads
on this subject?

Gary Chock,S.E.