The fundamental principle here is that structural Oak must only perform its structural work—keeping the building standing—while joinery Oak must do its job of keeping the weather out. This is because a structural beam will develop splits and move as it dries, and the mortice and tenon joints cannot be expected to be watertight. Achieving a weather seal between glass and wood can only be done with joinery-grade Oak, similar to how it’s done in ordinary windows.
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