JCLP said:
Canada is metric. All stength testing and certification of lumber fabricated and sold in Canada is done using metric units. Try to find a 3/4" thick of plywood made in Canada. Impossible. They are fabricated using metric sizes.
I remember when I did my thesis for my Structural Engineering degree, 25+ years ago, that all lumber, trusses, gusset plates etc, were metric and all findings were published in metric.
Cheers
JC
I started building my dream house 6 months ago. Clearly, I'm no expert. But I did go to a engineering school too.
My House plans dimensions where imperial, center to center measures in inches
Concrete thickness in inches (but strength in megapascals)
LVLs and I-Joist specifier sheets where in inches. Same with the I-joists web hole cutting instructions.
Plumbing: Imperial
Garage doors : imperial sizes, and so on.
Not once did I order something using the metric system, except for the concrete. The fact that lumber is cut using the metric system is irrelevant, simply because 19mm plywood is made to replace the real 3/4 inch plywood and nobody cares for the .05 mm difference.(except engineers

)
A lot of lumber sold in Canada is still named after the old imperial sizes. Contractors and framers still refer to these sizes & lumber yards employees are familliar with them. So no, Canada is not metric at 100% yet.