Rafter Anchor

Definition

A rafter anchor is a bolt or fastening device that attaches the parallel beams used to support a roof covering to the rafter plate.

Purpose

The purpose of a rafter anchor is to securely connect rafters to the top plate of a wall, ensuring the stability and integrity of the roof structure, particularly in high-wind or seismic areas.

Examples of Use

• In residential construction, rafter anchors are used to secure the roof framing to the walls, providing resistance to uplift forces.
• Commercial buildings use rafter anchors to ensure the roof structure remains attached to the supporting walls during adverse weather conditions.
• Rafter anchors are essential in areas prone to earthquakes, where additional reinforcement is necessary to maintain structural integrity.

Related Terms

• Rafter: A structural member extending from the ridge or hip to the wall plate, supporting the roof deck and its loads.
• Top Plate: The horizontal member at the top of a wall that supports the roof structure.
• Hurricane Tie: A metal connector used to secure rafters or trusses to the top plate, providing additional resistance to wind uplift.

Notes

Proper installation of rafter anchors is critical for ensuring the safety and durability of the roof structure, particularly in areas with high wind or seismic activity.