Massachusetts Unrestricted Construction Supervisor License Practice Test

When are wood sills on a concrete exterior wall required to be made of approved durable or treated wood?

1. When less than 6 inches from exposed ground

2. When less than 8 inches from exposed ground

3. When less than 18 inches from exposed ground

4. When used in all buildings except accessory structures

The correct answer is: When less than 8 inches from exposed ground

Wood sills on a concrete exterior wall are required to be made of approved durable or treated wood when they are less than 8 inches from exposed ground. This requirement is based on the need to prevent moisture damage and the associated risk of wood decay and insect infestation, which is particularly significant in areas where the wood is in close contact with the ground. The elevation threshold of 8 inches is used to define the point at which the risk of moisture-related issues becomes more pronounced, necessitating the use of materials that provide enhanced durability against the elements. Thus, when sills are situated at this distance or closer to the ground, using treated wood becomes essential to ensure longevity and structural integrity in construction.