Alabama Contractors License Practice Exam

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

6 mil PVC
60 mil Flexible Polymer Cement
Two-ply hot mopped felts
3 mil PVC

The correct answer is: 3 mil PVC

The choice of 3 mil PVC as a concrete or foundation waterproofing system is not acceptable primarily due to its inadequate thickness for effective waterproofing. Generally, waterproofing membranes require a certain thickness to provide sufficient resistance against water infiltration and structural moisture issues. In contrast, other materials listed, such as 6 mil PVC, 60 mil Flexible Polymer Cement, and two-ply hot mopped felts, are recognized for their reliability and effectiveness in preventing moisture intrusion. These options typically have greater thickness or design features that allow them to handle the stresses and potential leaks associated with concrete structures. Selecting an appropriate waterproofing system is critical for ensuring the longevity of concrete and foundation structures, and in this case, the 3 mil PVC does not meet the required standards, making it unsuitable for such applications.