A concrete slab on grade features a sawcut control joint made with a one-eighth-inch wide flexible thin blade, cut to a depth of T over 5 plus or minus one-quarter inch, ensuring the cut does not damage reinforcing steel before being filled with joint filler. The concrete slab rests on a fifteen mil Stego Wrap vapor barrier over a twelve-inch minimum low-expansion zone compacted to ninety-five percent, placed above the subgrade per geotechnical requirements. Reinforcement and slab thickness are specified per foundation plans, with a clear cover of T over 5 plus one-quarter inch maintained at the joint.
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