Architectural · A-ZY38A

Concealed Sprinkler Head and Ceiling Access Panel Detail

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A four and one-quarter inch concealed sprinkler head installation within a ceiling assembly notes that oversized holes are not required when flexible fittings are used. A parallel detail shows the attachment of an access panel, light fixture, diffuser, or glass fiber reinforced gypsum unit flush with the face of the ceiling using a one and one-half by one and one-half inch angle and acoustical ceiling suspension main runners and cross tees. Framing is secured with minimum number eight framing screws spaced at twelve inches on center alongside drywall screws. Vertical hanger wires and safety wires support the assembly, with fixtures weighing less than twenty pounds requiring a minimum of two twelve-gauge slack safety wires at diagonal corners, and fixtures weighing twenty pounds or greater requiring a minimum of four twelve-gauge taut hanger wires at each corner. All vertical safety and support wires are secured with a minimum of three tight turns within a one and one-half inch distance.

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