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2006 IBC Wood Sill Plate Washers

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Section 2305.3.11 of the 2006 IBC requires steel plate washers to be 0.229x3”x3” and the 2003 IBC required a 3/16”x2”x2” per 2305.3.10.  Does anyone know where this change came from and why?  I believe the larger width may be a result of trying to reduce cross-grain bending of the sill plate but why did the plate become thicker?

 

Joseph Goldbronn

Crosby Group

3444 Marconi Avenue

Sacramento, CA 95821

Phone - 916-563-7600

Fax - 916-563-7610