The Ontario Building Code | Material Standards

9.27.8.1. Material Standards

(1) Plywood cladding shall be exterior type conforming to,

(a) CSA O115-M, "Hardwood and Decorative Plywood",

(b) CSA O121, "Douglas Fir Plywood",

(c) CSA O151, "Canadian Softwood Plywood", or

(d) CSA O153-M, "Poplar Plywood".