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How much grout does that block wall actually swallow?
A grouted block wall is hollow until the truck arrives — and grout volumes surprise everyone. One 8×8×16 block holds about 0.24 cubic feet with both cells filled; a full wall runs roughly one cubic yard per 112 blocks. This calculator converts wall dimensions to grout yards with a waste allowance, full-fill or rebar-cells-only.
Masons and owner-builders use this because grout volume is the number everyone underestimates — a "small" 40-foot wall swallows almost two cubic yards. Ordering right means no cold joint while the second truck is dispatched.
Fully grouted 8-inch blocks: about 0.9 cubic yards per 100 blocks (0.24 cu ft per block × 100 ÷ 27). Filling only the rebar cells halves it. Always add 10% for spillage and pump priming.
Before — vertical bars are placed in the cells as the wall is laid, then grout is poured around them in lifts of about 4–5 feet and consolidated. Grouting first and pushing bars in traps air and creates hidden voids.