Cubic yards, 60-lb and 80-lb bag count, plus a recommendation on whether you should order ready-mix or just buy bags. Slab, strip footing, square column, or round Sonotube — all in one tool.
4″ residential walking · 5-6″ driveway · 8″ heavy load.
10% ready-mix · 15% bagged work.
20 ft × 10 ft × 4" · 66.67 ft³ raw · 10% waste added.
Probably more efficient to order ready-mix.
If 80 lb is sold out or too heavy.
Grid at 18″ o.c. with 10% overlap.
Most plants have a 0.5-1.0 yd minimum + short-load fee.
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