9.17.4.

(1) The width or diameter of a wood column shall be not less than the width of the supported member.

(2) Except as provided in Article 9.35.4.2., columns shall be not less than 184 mm for round columns and 140 mm by 140 mm for rectangular columns, unless calculations are provided to show that lesser sizes are adequate.

(1) Wood columns shall be either solid, glue-laminated or built-up.

(2) Built-up columns shall consist of not less than 38 mm thick full-length members,

(a) bolted together with not less than 9.52 mm diam bolts spaced not more than 450 mm o.c., or

(b) nailed together with not less than 76 mm nails spaced not more than 300 mm o.c.

(3) Glued-laminated columns shall conform to Section 4.3.

(1) Wood columns shall be separated from concrete in contact with the ground by 0.05 mm polyethylene film or Type S roll roofing.

(1) Where termites are known to exist, exterior wood columns such as porch supports shall be,

(a) pressure-treated with a chemical that is toxic to such termites, in accordance with Article 9.3.2.9.v1v2, or

(b) supported on non-cellulosic material extending not less than 150 mm above grade and located not less than 50 mm from the exterior wall of an adjacent building.