Architectural · A-BQ78G

Exhaust Fan Curb Detail

Materials

Steel Timber / Wood Metal (misc.)

Elements

Roofs Decks Waterproofing / Flashing Insulation Site / Paving Roof / Floor Openings

Connections

Welded Connection Deck Attachment

About this detail

An exhaust fan curb assembly is supported by a metal deck roof system with structural rigid insulation and a quarter-inch separation board beneath the membrane roofing. Additional pressure treated wood blocking is added as required to achieve an eight-inch minimum flashing height up the curb. A flashing membrane runs over exterior sheathing, protected by a twenty-four gauge counterflashing insert with welded corners secured by fasteners through steel and neoprene washers spaced twelve inches on center. A cricket is provided with a two-foot or more slope plan view layout to divert water around the exhaust fan curb.

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