Alabama Contractors License Practice Exam

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Study for the Alabama Contractors License Test. Prepare with quizzes featuring flashcards and multiple-choice questions, each supported by hints and explanations. Equip yourself for exam success!

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How much overlap is required for polyethylene film applied for below-grade moisture barriers?

3 inches
6 inches
12 inches
18 inches

The correct answer is: 6 inches

The correct choice indicates that a 6-inch overlap is required for polyethylene film used as below-grade moisture barriers. This requirement is in place to ensure that the film effectively prevents moisture from seeping through the seams of the barrier. A 6-inch overlap provides enough coverage to accommodate any potential contraction or movement of the material, which may occur due to temperature changes or soil settling. This overlap helps create a continuous moisture barrier, thus reducing the risk of water infiltration that can lead to structural damage or dampness in the building it is protecting. Other suggested overlaps might not offer adequate protection; a smaller overlap may not properly seal the seams, while larger overlaps cover more area but can lead to unnecessary increases in material costs and labor without significant benefit.