healthy homes, at lower cost

The timber frame designer

The first step before building your own home is to have the most detailed plan possible. The main cost driver is volume. Try the designer as many times as you like.

Your frame, ready to assemble

Where are you building?

Snow load and seismic hazard are read town by town in appendix C of the code. A 2.0 kPa default underestimates by 30 % in Quebec City and 48 % in Gaspé — a rafter there would be a full size too small. If your town is not listed, enter your own snow load. The preliminary sizing uses allowable stresses and National Building Code of Canada 2020 snow loads; the design to CSA O86 is your engineer’s, and in the US, your engineer checks it against NDS and ASCE 7.

Your frame: the Biobâtir model

Tie beam set on a continuous plate, purlin roof. The truss follows the span: plain up to 16 ft, queen posts up to 30 ft, king post beyond. The one-piece ridge beam rests on the king posts (at least one at each gable, always on a post); the rafters, whole, rest on it.

Your timber
Under the tie beam, and the attic
The timber you can get Leave blank: the plan uses full-length pieces, with no size limit. If your mill cannot supply longer or larger, say so: longer plates, tie beams and ridges are scarfed (the tie beam over a centre post), and the designer adds trusses rather than enlarging the timber.

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