For metal tile roofs, which underlayment option is acceptable?

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Study for the California Roofing Contractor Exam (C-39 License). Access practice questions, flashcards, and detailed explanations to ensure success. Enhance your preparation for a lucrative career as a licensed roofing contractor in California!

Multiple Choice

For metal tile roofs, which underlayment option is acceptable?

Explanation:
Underlayment for metal tile roofs must provide a reliable secondary waterproof barrier. The standard allows either a single 30-pound felt layer or two plies of 15-pound felt, which offer comparable protection in thickness and strength. Two plies give extra puncture resistance and redundancy where fasteners and metal tiles create openings. A single 15-pound layer would be too thin to meet this requirement, while a single 30-pound layer is acceptable but not the only option.

Underlayment for metal tile roofs must provide a reliable secondary waterproof barrier. The standard allows either a single 30-pound felt layer or two plies of 15-pound felt, which offer comparable protection in thickness and strength. Two plies give extra puncture resistance and redundancy where fasteners and metal tiles create openings. A single 15-pound layer would be too thin to meet this requirement, while a single 30-pound layer is acceptable but not the only option.

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