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Reference
- Materials — what each roof covering costs, how long it lasts, and what fails first
- Ratings and standards — UL 790, UL 2218, ASTM wind classes, IRC ventilation and ice barrier
- Glossary — square, valley, hip, ridge, rake, eave, drip edge, flashing, boot, cricket
- Calculators — area and squares, pitch, attic ventilation, claim value
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