Alabama Contractors License Practice Exam

Which of the following is NOT an acceptable concrete or foundation waterproofing system?

1. 6 mil PVC

2. 60 mil Flexible Polymer Cement

3. Two-ply hot mopped felts

4. 3 mil PVC

The correct answer is: 3 mil PVC

In the realm of construction and waterproofing, it is crucial for materials to provide adequate protection against water infiltration to ensure the longevity and integrity of buildings. The choice of waterproofing materials is critical in achieving this goal. Three options among the choices provided, such as 6 mil PVC, 60 mil Flexible Polymer Cement, and Two-ply hot mopped felts, are recognized within industry standards for their effectiveness in creating a barrier against water. PVC, or polyvinyl chloride, membranes are widely used for waterproofing due to their durability and resistance to water. The 6 mil thickness is generally adequate for many applications, while the 60 mil Flexible Polymer Cement provides additional thickness and flexibility, which is beneficial in accommodating movement and fluctuations in the substrate. Two-ply hot mopped felts have been traditionally used in roofing applications, offering a strong waterproof barrier when installed properly. In contrast, a 3 mil PVC does not meet the standard thickness typically required for effective waterproofing. It is considered too thin and may not provide sufficient protection against water intrusion, making it inadequate for use as a concrete or foundation waterproofing system. This lack of thickness compromises its ability to withstand hydrostatic pressure and other environmental factors, leading to potential failures in waterproof