Which term describes the notch that allows the rafter to rest on the double top plate?

The term that describes the notch allowing the rafter to rest on the double top plate is known as the "birds mouth." This notch is cut into the rafter to provide a fitting surface that aligns with the top plate of the wall structure, ensuring that the weight of the roof is effectively supported. The birds mouth is crucial for maintaining the structural integrity of a roof, as it helps distribute the load more evenly and prevents potential slippage of the rafter.

Other terms like the heel cut and seat cut refer to different modifications made to rafters. The heel cut is associated with the angle cut at the top of the rafter where it meets the ridge board, while the seat cut is the horizontal portion of the birds mouth that creates the flat surface for the rafter. The tail refers to the overhanging portion of the rafter that extends beyond the wall. Understanding these terms helps in the proper construction and fitting of rafters within roofing systems.