Mechanical · M-SGNEJ

Roof Penetration Hood and Pipe Flashing Detail

Materials

Elements

Roofs Decks Waterproofing / Flashing Insulation Site / Paving

About this detail

A mechanical exhaust or utility hood penetrates the roof assembly, secured with stainless steel screws on three sides minimum located six inches from the end and twelve inches on center. The internal pipe features a loose-fit joint and is pitched with a half-inch maximum slope away from the hood. The assembly coordinates with architectural roof deck, curb, insulation, and vapor barrier materials.

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