Hi folks,

In teh Charles McRaven book on building Hewn log houses he makes a claim that on std roof rafters, a typical install with a knee wall would cause the middle section to bow out (of the wall) due to roof loading. One could use a collar tie of sorts to keep the rafters & walls from spreading.

So he suggests an alternative that you can add a timber from B to A that would transfer the load which spreads the walls to the ends. The ends being knee walls are tied together. Resulting in the red triangle in the plane of the roof.

Thoughts?