Funny, I have Framed literally hundreds of buildings, mostly homes and light commercial. 90% of of the material we used was Doug fir since I was on the west coast.. When I moved to the south, the first thing I found odd was the lack of 4x12 and 4x14 as a common supplied item. the other was Doug fir and Redwood were hard to come by. Hemlock fir was more common than spf was. We used to call Hem Fir "piss-fir" it smelled that way when cutting and was not very reliable wood.