I attended a workshop at Fox Maple, Brad bb did also. I worked on one of the frames he has in his compound, the dormitory. One of the aspects he implemented was to rout a channel on the timbers side facing the infill, this acted as a key for the infill and to assist in stopping air flow after drying occurred. At least that was the plan when I was there. From my little knowledge of Steve C. I suspect that plan could change or may not have.

The key would also direct the checking of the timber to an unseen face.

Tim