What type fastener is NOT allowed when working above grade or below grade on wood foundations?

What type fastener is NOT allowed when working above grade or below grade on wood foundations?

• A. Electrogalvanized steel
• B. Stainless steel
• C. Copper
• D. Hot-dipped galvanized steel

Answer: (A)

Fasteners used with wood foundations must endure moisture, soil contact, and the chemicals in treated lumber. Electrogalvanized steel has a thin zinc coating that wears away quickly in these harsh conditions, making it prone to rapid corrosion and failure when used above or below grade. The other options are more resistant to corrosion: stainless steel naturally resists moisture and chemicals, hot-dipped galvanized steel has a thicker protective coating suitable for exterior, moist environments, and copper alloys are also compatible with treated wood in many applications. Because of the corrosion risk in this setting, electrogalvanized steel is not allowed.

Fasteners used with wood foundations must endure moisture, soil contact, and the chemicals in treated lumber. Electrogalvanized steel has a thin zinc coating that wears away quickly in these harsh conditions, making it prone to rapid corrosion and failure when used above or below grade. The other options are more resistant to corrosion: stainless steel naturally resists moisture and chemicals, hot-dipped galvanized steel has a thicker protective coating suitable for exterior, moist environments, and copper alloys are also compatible with treated wood in many applications. Because of the corrosion risk in this setting, electrogalvanized steel is not allowed.