Timber Framers Guild Forums General General Forum Questions rafter length and collar ties?

I would think about changing the roof to a 12/12 and drop the knee wall to 2' or a little less,(the distance from the top of the tie to top of plate), would help those engineers.

How about a set of crucks on the 2nd floor supporting a purlin plate to carry those rafter, with the dormer stretched out to most of the middle bay? This would add to the U.S. inventory.