Mechanical · M-RV9T5

Horizontal Fan Coil Mounting

Materials

Steel Timber / Wood Metal (misc.)

Elements

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

Connections

Welded Connection Bolted Connection Deck Attachment

About this detail

A roof curb mounting assembly for a horizontal fan coil unit over a metal deck roof system. The roof opening is framed with 4x4 angles between structural framing as required, supporting an 8-inch pressure-treated Douglas Fir wood rail sized to clear the top of the rigid roof insulation. A Pate curb model PC-2 is installed with roofing turned up and under the curb cap, complemented by 24-gauge galvanized sheet metal flashing sealed all around. The curb is secured to the wood rail using three-eighths-inch diameter by 1-and-a-half-inch cadmium-plated lag bolts at 16 inches on center with a minimum of two per side. Three-eighths-inch sheet metal screws with neoprene washers at 18 inches on center secure the duct flashing. Where roof deck flutes run perpendicular to the curb support, a 10-gauge tube filler is cut and fitted within every high and low flute. Additional connection details include a three-sixteenths-inch steel plate set one-eighth inch back from the corner of the flute for welding on both sides, and three-eighths-inch diameter through bolts with washers and locknuts at 12 inches on center securing the curb assembly.

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