车棚混凝土计算器 — 需要多少混凝土？

车棚混凝土指南

Carport slabs use 4–5 inch concrete at 3,500 PSI on compacted gravel. One-car carports are typically 12×20 ft; two-car versions are 20×20 ft. Slope ¼ inch per foot for drainage. A 20×20 ft carport at 5 inches needs approximately 6.2 cubic yards of concrete.