A stair lower stringer connects to structural support using a trimmed C12 channel sized to match the stringer, with channel-to-channel complete joint penetration splices. A 1/2-inch by 7-inch plate featuring two 2 1/2-inch horizontal long-slotted holes fastens the assembly with two 7/8-inch diameter bolts. An angle brace sized per plan ties into the connection. An expansion joint with a 1 1/4-inch gap spans across the detail, finished with an expansion joint cover plate sized per architect.
4" PLAN PER 3" ANGLE BRACING PER PLAN (2) 7/8"Ø BOLTS PL1/2x7 W/ 2 1/2" HORIZ LONG-SLOTTED HOLES 3/16 3 SIDES EXPANSION JOINT COVER PLATE PER ARCH 1 1/4" GAP PER ARCH 11" 3" 1 1/2" 1" 3" TRIMMED C12, CHANNEL SIZE TO MATCH STRINGER. CHANNEL TO CHANNEL CJP SPLICE PER 7/S531
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