Alabama Contractors License Practice Exam

For damp proofing, how thick should Portland cement parging be applied to masonry walls?

1. 1/4 inches

2. 1/2 inches

3. 3/4 inches

4. 3/8 inches

The correct answer is: 3/8 inches

For damp proofing applications on masonry walls, Portland cement parging is typically applied at a thickness of 3/8 inches. This thickness has been found to strike an effective balance between providing sufficient coverage to seal the masonry and minimizing the risk of issues such as cracking or poor adhesion that can occur with thicker applications. Applying Portland cement parging too thickly can lead to problems, as heavier layers may not dry evenly and can compromise the effectiveness of the damp proofing. A thickness of 3/8 inches allows for a robust barrier against moisture while ensuring that the material can effectively bond to the masonry surface. Thinner options, like a 1/4 inch application, may not provide adequate protection against water ingress, while thicker options, such as 1/2 inch or 3/4 inch, could create additional challenges during installation and long-term durability. Using the appropriate thickness is crucial in maintaining the integrity of the damp proofing system.