A 5/8-inch thick steel base plate with standard holes secures the ladder stringer using 3/4-inch diameter bolts. The base plate anchors into the concrete support with 3/4-inch diameter Hilti Kwik-X expansion anchors, element 418085 KH-EZ 3/4-inch by 7-inch with capsule 2346813 KHC 3/4-inch large. Installation requires a minimum embedment of 5 inches and must follow the manufacturer's printed instructions by certified installers. The connection incorporates 1/4-inch fillet welds at the stringer-to-plate interface, a 1/2-inch typical clearance, and a 6-inch minimum edge distance for the concrete support.
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