Structural panels or boards attached to wall framing to provide lateral stability, backing for siding, and weather protection.

Wall Sheathing is structural panels or boards attached to wall framing to provide lateral stability, backing for siding, and weather protection through continuous covering that strengthens wall assemblies while creating a base for exterior finishes and building envelope systems. This essential structural component consists of plywood, oriented strand board (OSB), or other panel materials that are fastened to wall studs to create rigid diaphragms, resist lateral forces, and provide nailing surfaces for exterior cladding systems. Wall sheathing is critical in building construction where it provides structural bracing, supports exterior finishes, contributes to weather resistance, and enhances building envelope performance, making it indispensable for wood frame construction, steel framing systems, and any building where structural stability and weather protection are necessary for building performance and occupant safety.

Wall sheathing is utilized in various construction applications and building systems including structural bracing where it provides lateral resistance to wind and seismic forces, exterior finish backing where it creates solid nailing surfaces for siding, brick veneer, and other cladding systems, weather barrier applications where it contributes to moisture protection and air sealing, insulation support where it provides backing for exterior insulation systems, fire-rated assemblies where it contributes to fire resistance ratings, and specialty applications including shear walls, hurricane-resistant construction, and high-performance building envelopes where enhanced structural and thermal performance are required. Each application requires appropriate material selection, installation methods, and integration with other building systems.

The types and materials of wall sheathing include plywood sheathing that provides excellent structural properties and moisture resistance, oriented strand board (OSB) that offers cost-effective structural performance, fiberboard sheathing that provides insulation value with moderate structural properties, gypsum sheathing that offers fire resistance and dimensional stability, foam sheathing that provides continuous insulation with limited structural capacity, and specialty products including structural insulated panels (SIPs), cement board, and engineered sheathing systems for specific performance requirements. Material selection depends on structural requirements, climate conditions, and building performance goals.

Fun Fact: The first plywood wall sheathing was used in the 1930s, and modern engineered sheathing can provide shear values exceeding 1,000 pounds per linear foot while weighing less than traditional board sheathing.

• Cavity Wall
• Cripple Wall
• Curtain Wall