[rascul]

> A 1x6 which is probably thicker

A 1x6 is .75 x 5.5 inches.

Plywood is still more expensive with your numbers. OSB may cost a little less than the plywood though.

[dubcanada]

That would depend on the mill, you can get nominal and actual sized wood. At least I can in Canada get true 1 inch x 6 inch wood.