Seat Cut

Definition

A seat cut is the cut at the bottom end of a rafter to allow it to fit upon the plate.

Purpose

The purpose of a seat cut is to ensure that the rafter fits securely on the top plate of a wall, providing a stable connection and proper alignment in roof construction.

Examples of Use

• Carpenters make seat cuts on rafters to ensure a precise fit on the top plate when framing a roof.
• Seat cuts are essential in constructing gable, hip, and shed roofs to provide a stable and secure connection.
• In timber framing, seat cuts help distribute loads from the roof to the supporting walls.

Related Terms

• Birdsmouth Cut: A notch cut into a rafter to allow it to sit securely on the top plate of a wall.
• Top Plate: The horizontal member at the top of a wall frame to which rafters are attached.
• Rafter: A sloped structural member used to support the roof deck and its loads.

Notes

Properly made seat cuts are critical for the structural integrity and alignment of the roof, ensuring that rafters are securely attached and properly positioned.