A contraction joint detail in a concrete slab features a sawed joint sealed between one-eighth and one-quarter inch wide, extending to a depth of H over four minimum with a three-inch maximum dimension. Smooth steel dowels measuring three-quarters of an inch in diameter by one foot four inches long are spaced at one foot on center across the joint, with one end painted and greased to allow movement. A vapor barrier sits below the slab, which bears on a four-inch capillary water barrier.
H H/4 MIN 3" MAX 1/4" CONTRACTION JOINT (CTJ) 4" CAPILLARY WATER BARRIER VB S-502 A 1/8" TO 1/4" SEALED (SAWED) SMOOTH DOWELS 3/4" DIA X 1'-4" @ 1'-0" OC PAINT & GREASE ONE END
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