A 14-gauge minimum contractor-engineered mechanical curb bears on structural steel angles attached to the roof framing, featuring a variable angle depth coordinated with the architectural finish roof assembly. The curb sits above a metal roof deck and roof insulation system, with angle legs equal to the insulation thickness and a minimum 1/4-inch thickness. Vertical angles sized at a minimum of L2x2 are provided by the joist supplier and welded with typical 3/16-inch fillet welds. Steel joists and joist chord reinforcing are installed per plan and typical detail references.
A SECTION ROOF ASSEMBLY SEE ARCH METAL ROOF DECK SEE PLAN B SECTION 1/4 1-6 B C C SECTION VERTICAL ANGLE PER JOIST SUPPLIER (L2x2 MIN) 3/16 TYP 3/16 TYP. 3/16 TYP. JOIST CHORD REINFORCING PER TYPICAL DETAIL 1/S740 VERTICAL ANGLE PER JOIST SUPPLIER (L2x2 MIN) STEEL JOIST SEE PLAN ANGLE LEG EQUAL TO INSULATION, 1/4" THICKNESS MIN MIN 0' - 0 1/2" ANGLE DEPTH VARIES. COORD WITH ARCH FINISH ROOF ASSEMBLY DEPTH AS REQUIRED MECHANICAL CURB (14 GA MIN) ENGINEERED BY CONTRACTOR, TAPERED AS REQUIRED TO ACCOMODATE ROOF SLOPE
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