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What is the effective thickness of the 2.25 in form?

emdylag
Sun, 04 Jul 2021 14:27:23 GMT

If I did the math right, the effective thickness of the standard forms is 1 5/8". This seems like an odd number. Would expect 1 1/2" so I would like to confirm my math. By effective thickness, I mean the thickness from the bottom of the cement board to the top of the counter - without any overhang. This number is critical as I need to cut out for a grill and this needs to be exact. Thanks!