My crib work days go far back Joe. Beer was still cold and the women warm.
Doubled sill plates are all I can remember and still see them using doubled sill plates on homes today.
Marc. It is not so much for dead load as it is for live loading.
yes snow is live loading but in the states and along waterfronts and open fields wind shear is amplified.
One 2/4 does not allow the manufactured hurricane plates or straps enough anchorage if my mind is working right.
like to get together and talk HI you know my number.
HI only please.
Hope you has fun in Ontario.
A single plate will not hold a truss or rafter in place when hurricane winds are loading a wall/eave or when seismic tremors are live loading the structure altogether.
I could be wrong.
I will look it up again.
Just my 2 cents.
Single plate are a call out.
I have called out 2 this year. Its a bear to crawl in an attic to the eave but when you have to, you have to. I must get photos.
PS: Mark and Joe.
The first home last year had the roof re-engineered but the builders used one 2/6" plate and walls had 2/6" with 24 centers.Doubled on loading areas.
The mechanical casement windows on the second floor jammed in the pockets. Once you got the out of the frame pocket they opened and closed with ease until the were returned into the framing pocket.
All the handles where off on all the windows on the second floor. It caught my eye. The main floor windows, all the same by the way worked great.
That sent me into the attic with a hypotheses. Loading and sill plate for one.