In "modern" framing techniques there is a bit of worry about shear bracing. This is typically satisfied by the use of plywood panels and a specified nailing pattern. Not so on a timber frame roof that is sheathed with boards (butted, shiplap, t&g). Nearly every photo I see of the underside of a timber frame (boarded) roof shows no evidence of diagonal bracing. So...

What is the current wisdom on the need for diagonal bracing of a timber frame roof with board sheathing?

In my experience of seeing and working on hundreds of old buildings I see no need for bracing in the roof plane.


Their certainly are historical precidents of "wind bracing" which shows people have been concerned about this issue for hundreds of years!

Jim