Roof Sheathing

Definition

Roof sheathing is the first layer of covering on a roof, fastened to the rafter boards, used to support the roofing material.

Purpose

The purpose of roof sheathing is to provide a solid, stable base for the application of roofing materials, enhancing structural integrity and helping distribute loads across the roof.

Examples of Use

• Plywood or OSB (Oriented Strand Board) sheathing installed on residential roofs to support asphalt shingles or other roofing materials.
• In commercial buildings, metal decking may be used as roof sheathing to support various roofing systems.
• Roof sheathing is essential for both flat and sloped roofs, providing a continuous surface for waterproofing membranes or roofing materials.

Related Terms

• Rafter: A sloped structural member used to support the roof deck and its loads.
• Underlayment: A layer of material installed between the roof sheathing and roofing materials for additional protection.
• Roof Deck: The surface that covers the roof structure, providing a base for roofing materials.

Notes

Proper installation of roof sheathing is critical for the overall strength and durability of the roof, ensuring it can support the roofing materials and withstand various loads.