This is my first post, so thanks in advance for the assistance.

I have an opportunity to purchase an 1840's timberframe barn in Ontario. It is a 30 X 40 feet, with 4 bents. The cross beams clear the entire 30 foot span with no posts. The beams are 12 X 12 pine. There is also a "Swing beam" that is 19 inches high in the middle and tapers to 12 inches on the end.

I'm not sure I've given enough information, but my question is how would this design meet current requirements. We are looking to move the barn to Alberta, it would have a metal roof, but I don't have details on the pitch or truss design. The current design has 10X12inch purlins (spelling?).

Thanks.