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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What is an acceptable thickness for polyethylene sheeting used as a moisture barrier?

4-mil
6-mil
8-mil
10-mil

The correct answer is: 6-mil

The choice of 6-mil polyethylene sheeting as an acceptable thickness for use as a moisture barrier is based on established industry standards that provide sufficient durability and effectiveness in preventing moisture intrusion in various applications, such as foundation work and under slabs. This thickness balances strength and flexibility, allowing the material to resist punctures and tears while effectively blocking moisture. A 4-mil thickness may not provide adequate protection against moisture and potential damage, leading to structural issues or mold growth in environments where humidity and moisture are concerns. Thicker options like 8-mil or 10-mil, while stronger, may not be necessary for all applications and can be more expensive to use, adding unnecessary cost without significant benefit in certain situations. Therefore, 6-mil is commonly recommended for standard moisture barriers in building practices, making it the optimal choice.