A concrete slab on ground transitions at a door threshold with a contraction joint and a door keyway. A half-inch flexible closed cell foam plank is placed at the door keyway, and a quarter-inch flexible closed cell foam plank with sealant is detailed at the slab edge. Reinforcement consists of number four bent bars located one inch clear to the top of the slab, with matching number four bent bars at two inches clear to the bottom of the slab at slabs seven inches or thicker. Additional number four bent bars are located one and a half inches clear to the top of the slab with matching bottom bars at two and a half inches clear for thicker slabs. All reinforcement is bent as required to avoid crossing construction or contraction joints while maintaining two inches clear to the joint.
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