Steel angle members span between adjacent joists to support the roof drain assembly. For joist spacings up to 6 feet, 3 inch by 3 inch by 1/4 inch angles are used; spacings greater than 6 feet require 4 inch by 4 inch by 1/4 inch angles. These angles support the roof deck at the drain opening. Plumbing drawings determine the specific location and size of the roof drain and overflow drain.
Text on the drawing
SEE PLUMBING DRAWINGS FOR LOCATION AND SIZE OF ROOF DRAIN AND OVERFLOW DRAIN. L3x3x1/4" @ JOIST SPACING UP TO 6'-0" L4x4x1/4" @ JOIST SPACING > 6'-0" ROOF DECK SEE PLAN JOIST SEE PLAN DETAIL BOOK REF. SHEET: S2.27 DATE: 02/20/2023
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