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계단 콘크리트 가이드

Exterior concrete steps should have a 7-inch rise and 11-inch tread for comfortable and code-compliant stair geometry. Use 3,500–4,000 PSI air-entrained concrete in freeze-thaw climates. Broom-finish for traction. Keep moist for 7 days. Three 4-ft wide steps at 7-in rise and 11-in tread use approximately 0.5 cubic yards.