Roof deck openings larger than 4 inches require structural framing reinforcement using W10x12 wide flange beams, C8x11.5 channels, and L3x3x1/4 angles. Openings less than 4 inches require no reinforcement provided no more than one web is cut and spacing meets structural criteria. Reinforcement framing can be omitted when dimension Y is 12 inches or less and the deck is continuous over the support.
A - W10x12 W10x12 C8x11.5 C8x11.5 MAX 6' - 0" MAX, TYP DECK SPAN C - OPNG > 4" 24"x24" MAX MIN 2' - 0" MAX 2' - 0" MIN 4' - 0" OPNG IN ADJACENT SPAN OMIT WHEN "Y" IS 12" OR LESS & DECK IS CONT OVER SUPT MIN 4' - 0" Y OPENING IN SAME SPAN DECK SPAN 12" S S S OPNG LESS THAN 4" NEED NO REINF. IF: - NO MORE THAN ONE WEB IS CUT - S=AT LEAST 3x LARGER OPNG SIZE W10x12 C8x11.5 "Y" 6" MAX - B 6" MAX OMIT WHEN "Y" IS 12" OR LESS & DECK IS CONT OVER SUPT L3x3x1/4 MAX 6' - 0"
Members view this detail in full resolution, download the CAD files (SVG, PDF), and can adapt it in the built-in CAD editor — export DXF, DWG, or PDF.
Start membership