Understand the Purpose of a Bird's Mouth

What happens here

The presenter introduces the project: how to use a speed square to mark a 'bird's mouth' cut. He explains that a bird's mouth is a V-shaped notch made in a rafter. This notch allows the rafter to sit securely and flatly on the top plate of a wall, ensuring stability for the roof structure. Understanding this purpose is crucial before making the cut.

Goal: Understand what a bird's mouth cut is and its structural function.