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What's the minimum recommended roof slope to ensure proper water drainage?
Correct Incorrect Most building codes (e.g., International Residential Code) require a minimum slope of 1/4:12 (1.19°) for waterproof materials like metal roofing, and 2:12 (9.46°) for asphalt shingles. However, 1:12 (4.76°) is a common practical minimum for drainage.