Massachusetts Unrestricted Construction Supervisor License Practice Test

What is the minimum required thickness of a parging coat used to damproof the surface of masonry unit walls?

1. 1/4 inch

2. 3/8 inch

3. 1/2 inch

4. 5/8 inch

The correct answer is: 3/8 inch

The minimum required thickness for a parging coat used to damproof the surface of masonry unit walls is established at 3/8 inch. This thickness is important because it provides enough material to effectively bridge any small cracks or voids in the masonry surface, ensuring adequate protection against moisture infiltration. When applied correctly, the parging coat acts as a barrier, significantly reducing the chances of water penetration, which can lead to deterioration of the masonry over time. A thickness of 3/8 inch strikes a balance between being thick enough to perform its function without being overly heavy or causing issues with adhesion. This standard is supported by building codes and industry best practices aimed at ensuring durable and effective water resistance in masonry construction. Lesser thickness, while possibly easier to apply, would not provide sufficient coverage to effectively damproof the wall, while a greater thickness may not offer any additional benefit in this particular application. This makes 3/8 inch the accepted minimum thickness for presenting a reliable solution for damproofing masonry surfaces.