The Ontario Building Code | Materials
(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.