Plumb Cut

Definition

A plumb cut is any cut made in a vertical plane; specifically, it refers to the vertical cut at the top end of a rafter.

Purpose

The plumb cut ensures that the rafter fits correctly against the ridge board or wall plate, providing a precise and stable connection in roof framing. It helps maintain the correct angle and alignment of the rafters.

Examples of Use

• Roof Construction: Making plumb cuts on rafters to fit against the ridge board in gable roofs.
• Dormers: Creating precise cuts for dormer framing in pitched roofs.
• Trusses: Ensuring accurate connections in prefabricated roof trusses.

Related Terms

• Birdsmouth Cut: A notch cut into a rafter to allow it to sit securely on the wall plate.
• Seat Cut: The horizontal cut on the bottom of a rafter that rests on the top plate of the wall.
• Angle Cut: Any cut made at an angle, including plumb cuts and seat cuts.

Notes

• Tools: Plumb cuts are typically made using a circular saw or handsaw, guided by a framing square.
• Accuracy: Ensuring precise plumb cuts is crucial for the structural integrity and alignment of the roof.