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*True* T1-11 is 5/8 inches thick and the grooves are 1/4-inch deep, leaving 
you with effectively a 3/8-inch panel that has good face material on only one 
side.  Where does most of plywood's strength come from? (Rhetorical 
question.)  You make the call!

A. Roger Turk, P.E.(Structural)
Tucson, Arizona

Mark Baker wrote:

>>Does anyone know if T-111 siding has an ICBO approval for use as shear panel
sheathing? I have a non-conforming structure which has to be brought up to 97
UBC and it is sheathed with T-111.<<