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Re: diagonal sheathing

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Section 2315.3.1 of the 1997 UBC gives the rules for constructing a 
Conventional lumber diaphragm.  It appears to be unchanged from Section 
2514(b) of the 1970 UBC.  The 1970 edition and the 1994 edition of the UBC 
state that conventional lumber diaphragms may be used to resist shear due to 
wind or seismic forces not exceeding 300 pounds per linear foot.  The 1994 
edition gives rules for adjusting the allowable value depending on the 
species of sheathing material.

The UCBC, Table A-1-D, allows 600 pounds per foot if the diaphragm includes 
finish wood flooring over the diagonal sheathing; Division 88 of the L.A. 
City Building Code allow 450 pounds for this kind of diaphragm.

Nels Roselund
Structural Engineer