Hi folks,
I agree somewhat with shaun's questioning the apparent over-use of simpson hardware, especially since Jon indicated that his frame was for a house/cabin. Depending on the enclosure details, mainly the sheathing and/or internal wall bracing, the straps may either be reduced in number or eliminated all together. What are you planning for the roof and walls, Jon? I wouls recommend Simpson tie-downs on ALL frames, however...
That said, I would agree with Will's approach if this was a barn or outbuilding with simple wood cladding for the enclosure (e.g., clapboards, board and batten, or something similar). The metal straps will help the frame distribute the loads more effectively, and allow it to act as the only structural system needed. This is why I would argue for deleting dovetails for joists and purlins... What exactly do you mean by "drop in" in regards to the joinery you are using on your purlins, Jon?
This topic seems to wander over into the other discussion regarding earthquake loading and the need for a well-defined lateral laod resisting system, regardless of the type of lateral load (i.e., wind or earthquake).
Mark Gillis, P.Eng.
