According to NRCA recommendations, which material is suggested for roof sheathing?

The recommendation of using APA performance rated OSB (Oriented Strand Board) and plywood panels for roof sheathing aligns with industry standards set out by the National Roofing Contractors Association (NRCA). These materials are recognized for their structural integrity, durability, and resistance to moisture when appropriately used, making them ideal for supporting roof systems.

OSB and plywood are engineered wood products that offer a balance of strength and weight, which is critical in roofing applications where material performance under load and environmental conditions is paramount. They ensure good load-bearing capacity, minimizing the risk of structural failure over time.

Choosing roof sheathing materials like asphalt shingles, chipboard, and particleboard does not meet the NRCA’s guidelines due to their inferior performance characteristics. Asphalt shingles are roofing materials that go on top of sheathing, while chipboard and particleboard lack the necessary structural properties and moisture resistance, which could lead to issues like sagging or mold growth. Similarly, concrete and steel are typically used for different types of roofing systems, such as flat roofs, but would not be appropriate as traditional sheathing materials.