Unreinforced round openings in 3-inch type N roof deck are permitted up to 5-1/2 inches in diameter in the high flute, while 1-1/2 inch type HSB roof deck allows up to 4-1/2 inch diameter openings in the high flute. Reinforced openings passing through a single deck low flute require angles sized at 2x2x3/16 with two number 10 self-drilling screws at each low flute on each side of the opening. Type N deck accommodates round or square openings up to 13 inches maximum diameter, and type HSB deck accommodates openings up to 9 inches maximum diameter. These reinforcing angles must extend a minimum of two flutes beyond the opening on each side. Openings larger than these thresholds or passing through more than one deck low flute require supplemental sub-framing.
OPENINGS WITHOUT REINFORCING: 3" - TYPE N ROOF DECK 1 1/2" - TYPE HSB ROOF DECK REINFORCED OPENINGS: 3" - TYPE N ROOF DECK 1 1/2" - TYPE HSB ROOF DECK 5 1/2" DIA. MAX. ROUND OPENING LOCATED IN DECK HIGH FLUTE 4 1/2" DIA. MAX. ROUND OPENING LOCATED IN DECK HIGH FLUTE CENTERED ON LOW FLUTE AS SHOWN ROUND OR SQUARE OPENING THRU (1) DECK LOW FLUTE 13" DIA. MAX. EACH SIDE EXTEND (2) FLUTES MIN. BEYOND OPENING L2x2x3/16 w/ (2) #10 SELF DRILLING SCREWS AT EACH LOW FLUTE EACH SIDE OF OPENING L2x2x3/16 w/ (2) #10 SELF DRILLING SCREWS AT EACH LOW FLUTE EACH SIDE OF OPENING CENTERED ON LOW FLUTE AS SHOWN ROUND OR SQUARE OPENING THRU (1) DECK LOW FLUTE 9" DIA. MAX. EACH SIDE EXTEND (2) FLUTES MIN. BEYOND OPENING NOTE: REF. 2/S602 FOR SUB FRAMING AT OPENINGS LARGER THAN THOSE SHOWN OR OPENINGS THROUGH MORE THAN (1) DECK LOW FLUTE. OPENINGS WITHOUT REINFORCING: 3" - TYPE N ROOF DECK 1 1/2" - TYPE HSB ROOF DECK REINFORCED OPENINGS: 3" - TYPE N ROOF DECK 1 1/2" - TYPE HSB ROOF DECK 5 1/2" DIA. MAX. ROUND OPENING LOCATED IN DECK HIGH FLUTE 4 1/2" DIA. MAX. ROUND OPENING LOCATED IN DECK HIGH FLUTE CENTERED ON LOW FLUTE AS SHOWN ROUND OR SQUARE OPENING THRU (1) DECK LOW FLUTE 13" DIA. MAX. EACH SIDE EXTEND (2) FLUTES MIN. BEYOND OPENING L2x2x3/16 w/ (2) #10 SELF DRILLING SCREWS AT EACH LOW FLUTE EACH SIDE OF OPENING L2x2x3/16 w/ (2) #10 SELF DRILLING SCREWS AT EACH LOW FLUTE EACH SIDE OF OPENING CENTERED ON LOW FLUTE AS SHOWN ROUND OR SQUARE OPENING THRU (1) DECK LOW FLUTE 9" DIA. MAX. EACH SIDE EXTEND (2) FLUTES MIN. BEYOND OPENING NOTE: REF. 2/S602 FOR SUB FRAMING AT OPENINGS LARGER THAN THOSE SHOWN OR OPENINGS THROUGH MORE THAN (1) DECK LOW FLUTE.
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