NRCA ProCertified Asphalt Shingle Installer Practice Questions - NRCA ProCertified Asphalt Shingle Installer Exam

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Which underlayment standard specifies the requirements for Type II (heavyweight #30) felt used beneath asphalt shingles?

ASTM D226 Type II ASTM D1970 ASTM D4869 ASTM D6757

Correct Answer:

ASTM D226 Type II

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