Coastal and Floodplain Construction Inspector's Practice Exam

What must be used under all nuts and bolt heads that bear directly on wood?

1. Stoppers

2. Nuts

3. Washers

4. Plates

The correct answer is: Washers

When it comes to structural applications where nuts and bolt heads come into direct contact with wood, using washers is essential. Washers serve multiple purposes in this context. First, they help distribute the load placed by the bolt head or nut over a larger surface area. This is particularly important when fastening into wood, as it can compress under pressure. Without a washer, the point of contact could create an indentation or even split, which may compromise the integrity of the wood over time. Secondly, washers provide a barrier between the metal and the wood, which can help prevent rust and corrosion from occurring on the fastener due to moisture exposure. This protective layer is crucial in maintaining the longevity of the connection and ensuring the stability of the structure. In summary, using washers under all nuts and bolt heads that bear directly on wood is a best practice to ensure load distribution and protect both the metal fasteners and the wooden surface, contributing to the overall durability and safety of the construction.