NRCA Metal Panel Practice Questions - NRCA ProCertified Metal Panel Installer Exam

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On a solid-deck substrate, which underlayment type provides the highest temperature resistance and is recommended beneath metal panels on steep-slope roofs exposed to elevated heat?

Non-perforated felt (ASTM D226 Type I) Self-adhering modified bitumen membrane (ASTM D1970) High-temperature self-adhering membrane rated to 265°F or higher Polyethylene woven geotextile underlayment

Correct Answer:

High-temperature self-adhering membrane rated to 265°F or higher

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