Massachusetts Unrestricted Construction Supervisor License Practice Test

Are sleepers and sills on a concrete slab required to be pressure treated?

1. No, they can be untreated

2. Yes, they must be pressure treated

3. Only if they are above grade

4. Only in moist environments

The correct answer is: Yes, they must be pressure treated

Sleepers and sills situated on a concrete slab indeed must be pressure treated. This is crucial because wood in direct contact with concrete is susceptible to moisture, which can lead to rotting and infestations. Pressure-treated wood is subjected to a meticulous process that infuses preservatives into the timber, enhancing its resistance to decay, insects, and moisture. When installed within a building, these elements, because they sit close to or on a concrete surface, are prone to dampness—especially if the concrete is not adequately sealed or if there are fluctuations in humidity. While untreated wood might seem acceptable in some dry conditions, using it could lead to serious long-term structural issues. Thus, the requirement for pressure-treated wood adds a layer of protection that ensures the durability and integrity of the construction. The other options suggest conditions where pressure treatment might not apply, but these do not account for the inherent risks associated with wood near concrete, emphasizing why pressure treatment is a universal requirement in this context.