NRCA Slate Practice Questions - NRCA ProCertified Slate Systems Installer Exam

According to ASTM C406, which slate grade has the longest service-life expectancy?

Grade S1 (75-200 years) Grade S2 (40-75 years) Grade S3 (20-40 years) Grade S4 (10-20 years)

Grade S1 (75-200 years)

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