Which statement is true regarding materials used for below-grade fasteners attaching plywood to exterior wall studs?

Which statement is true regarding materials used for below-grade fasteners attaching plywood to exterior wall studs?

• A. Copper bolts.
• B. Stainless steel.
• C. Aluminum nails.
• D. Fiberglass screws.

Answer: (B)

When fasteners are used in areas that are damp or in contact with soil, they must resist corrosion so the plywood remains securely attached over time. Stainless steel fasteners are designed to withstand moisture and prevent rust, keeping the connection strong in below-grade exterior locations. Copper bolts, while resistant to some elements, can create galvanic issues with steel studs and are not the typical, practical choice for wood-to-wood connections in these conditions. Aluminum nails tend to corrode and lose strength in wet environments, making them unreliable for structural attachments. Fiberglass screws avoid metal corrosion but often don’t provide the required strength or standard performance for attaching plywood to studs in exterior framing. So stainless steel offers reliable strength and long-term corrosion resistance for below-grade fastening in exterior wall assemblies.

When fasteners are used in areas that are damp or in contact with soil, they must resist corrosion so the plywood remains securely attached over time. Stainless steel fasteners are designed to withstand moisture and prevent rust, keeping the connection strong in below-grade exterior locations.

Copper bolts, while resistant to some elements, can create galvanic issues with steel studs and are not the typical, practical choice for wood-to-wood connections in these conditions. Aluminum nails tend to corrode and lose strength in wet environments, making them unreliable for structural attachments. Fiberglass screws avoid metal corrosion but often don’t provide the required strength or standard performance for attaching plywood to studs in exterior framing.

So stainless steel offers reliable strength and long-term corrosion resistance for below-grade fastening in exterior wall assemblies.