Rafters at Ridge Tongue and Blind Mortise

Blind MortiseThis is an exploded view of a tongue and blind mortise at the ridge.
The rafters are again 4×6 at 12/12 pitch with a 1 1/2″ tenon and mortise with a 3/4″ peg.
The mortise doesn’t go all the way through the rafter and it doesn’t go all the way to the top end. This is what it means when we say it is “blind”.

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