Rebar Lap-Splice Length
The tension lap-splice length as a multiple of the bar diameter (the jobsite 40-48 bar-diameter rule), with a 12 in floor and a feet-and-inches readout. The engineer of record and the drawings govern.
Formula and source
Lap = max(lap factor x bar diameter, 12 in); db from the #3..#11 table (bar number / 8 in for #3..#8).
ACI 318 development-and-splice basis (Class B tension lap ~1.3 x development length, by name).
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