What type of material is specified for exterior wall sheathing in high-wind areas?

• A. Plywood or OSB (Oriented Strand Board)
• B. Concrete panels
• C. Vinyl siding
• D. Gypsum board

Answer: (A)

The specification of plywood or oriented strand board (OSB) as the material for exterior wall sheathing in high-wind areas is based on their strength and resilience. These materials provide the necessary structural support and are designed to withstand the forces that can occur during severe weather conditions, such as hurricanes or tornadoes, which are more common in high-wind zones.

Plywood and OSB have properties that help in distributing loads and resisting shear forces, making them ideal for enhancing the overall stability of the building envelope in such vulnerable areas. They are also typically recommended because they can effectively anchor the exterior finish materials and absorb changes in moisture without compromising structural integrity.

The other materials listed do not meet the same criteria for sheathing in high-wind areas. Concrete panels serve a different purpose and are typically used as a foundational or structural wall material rather than as sheathing. Vinyl siding is an exterior finish that doesn't provide the structural support needed for sheathing. Gypsum board is mainly used for interior walls and is not suitable for use as exterior sheathing in environments exposed to high winds. Thus, the use of plywood or OSB aligns with the safety requirements and building code standards for high-wind zones.