This Canadian industry comprises establishments primarily engaged in manufacturing boards, dimension lumber, timber, poles and ties, and siding, from logs and bolts. These establishments produce lumber that may be rough, or dressed by a planing machine to achieve smoothness and uniformity of size, but (except in the case of siding) is generally not further worked or shaped.

This Canadian industry comprises establishments primarily engaged in sawing blocks of wood to produce shingles or splitting blocks of wood to produce shakes.

This Canadian industry comprises establishments primarily engaged in treating lumber, plywood, poles and similar wood products, produced in other establishments, with preservatives to prevent decay and to protect against fire and insects. Pressure treating is the most common method used.