Round penetrations located within the high flute of three-inch Type N roof decks and one-and-one-half-inch Type HSB roof decks require a minimum one-quarter-inch clearance spacing. These unreinforced single isolated openings maintain specified dimensional limits relative to the deck profile without requiring additional structural framing members.
SINGLE ISOLATED OPENINGS WITHOUT REINFORCING: 3" - TYPE N ROOF DECK 1 1/2" - TYPE HSB ROOF DECK ROUND OPENING LOCATED IN DECK HIGH FLUTE ROUND OPENING LOCATED IN DECK HIGH FLUTE 1/4" MIN. 1/4" MIN. 1/4" MIN. 1/4" MIN.
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