Architectural · A-3M2KG

Alternating Tread Device Roof Penetration and Hatch Detail

Materials

Elements

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

About this detail

An alternating tread device is installed through a roof opening with an integral safety rail and safety post set level using shims or blocks as required. A flashing membrane is fully attached up and over the top of the curb where it meets the roof membrane and manufacturer-specified sealant. The assembly sits atop rigid insulation and a roof deck, maintaining a maximum twelve-inch stepover with the top tread positioned at the roof membrane level.

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