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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Which of the following is NOT permitted as a vapor retarder over sheathing in Zone 5?

Vented cladding over OSB
Vented cladding over plywood
Vented cladding over sheathing
Vented cladding over gypsum

The correct answer is: Vented cladding over sheathing

In the context of building construction and energy efficiency standards, particularly relating to vapor retarders and their placement, the key factor in determining compliance lies in how these materials interact with moisture in various zones. In Zone 5, which is considered a mixed-humid climate, it is essential to manage moisture effectively to prevent issues related to condensation and mold growth. The option that indicates a vapor retarder not permitted over sheathing aligns with the principle that vapor retarders should be placed in such a way that they do not trap moisture within the wall assembly. While vented cladding can be beneficial for moisture control when placed over certain materials, it is not effective when used over sheathing. This is because OSB (oriented strand board) and plywood can absorb moisture, and placing a vapor retarder there could prevent any trapped moisture from escaping, leading to damage. In situations where vented cladding is used, it generally encourages airflow, allowing potential moisture to escape rather than being held against the sheathing. Therefore, the correct answer highlights the importance of considering material compatibility and moisture dynamics to ensure a resilient and moisture-protective building envelope in Zone 5.