Mechanical · M-GF5ZH

Piping and Conduit Roof Penetration

Materials

Steel Timber / Wood Metal (misc.)Membrane / Roofing

Elements

Beams Stairs Roofs Ceilings Waterproofing / Flashing Insulation Anchors / Embeds Roof / Floor Openings

Connections

Welded Connection

About this detail

A roof penetration detail for refrigerant piping and electrical conduit passing through a metal roof and existing built-up roofing. The assembly is framed by two-by-ten treated wood blocking secured to the roof with steel angle clips using one-quarter-inch diameter lag screws and expansion anchors. A four-inch treated wood cant strip and two layers of fifteen-pound felt stripping set in plastic cement tie the curb into the existing roofing membrane. The void space around the pipes inside the eight-inch diameter opening is filled with expanding urethane foam insulation. A galvanized steel cap and rain hood with a sloped top is secured to the flashing with screws at three inches on center. The interior piping is supported by a steel pipe hanger attached with clamps and threaded rods.

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