TIL that tapping a fresh brick with a wrench handle tells you if it's hollow, and my trowel lied to me for 2 weeks

Nathan Patel · 2026-09-25T02:50:02.139559+00:00

Spent two weeks laying a garden wall in Tucson where half the bricks rang flat and solid but started cracking after the first rain, while the ones I set aside as junk because they sounded dead have held up fine, so now I want to know if anyone else checks bricks by sound or if I'm just being weird about it.

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TIL that tapping a fresh brick with a wrench handle tells you if it's hollow, and my trowel lied to me for 2 weeks | Bricklayers - HW Forums