Architectural · A-XVNHE

Roof Access Hatch Curb Flashing Detail

Materials

Timber / Wood Metal (misc.)Gypsum / Drywall Membrane / Roofing

Elements

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

Connections

Rebar Splice / Development

About this detail

The roof assembly starts with roof framing supporting three-quarter-inch plywood sheathing and three inches of rigid insulation, adhered with EPDM roof membrane bonding adhesive and single-ply primer with splice tape. The wood curb is framed with two-by-four wood framing anchored with a wood nail, and wrapped with EPDM membrane curb flashing over a variable cant strip and continuous butyl tape. The metal hatch base is secured to the wood curb using lag screws at sixteen inches on center with sealant over the fastener heads, complemented by metal counter flashing. The interior curb wall finishes with painted gypsum board typical, maintaining a six-inch minimum height above the roof surface.

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