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Re: double sided shear walls

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In lieu of 3x sole plates, my approach is:

At sole plates bolted to concrete or masonry, specify 3x with 4x as an 
acceptable alternative.

At sole plates nailed through plywood diaphragm to floor framing, specify 2x 
continuous with 2x blocking between the studs, nailed to the sole plate with 
the same number of 10d nails per foot as the total plywood edge nails per 
foot on one side; the plywood is nailed each side with half of the edge 
nailing into the sole plate, half into the blocking, similar to the way it is 
nailed to the top plate, but keeping nails away from blocking ends. 

Nels Roselund
Structural Engineer