Architectural · A-HCY4F

Roof Penetration Clearances

Elements

Walls Roofs Site / Paving Roof / Floor Openings

About this detail

Roof penetrations such as pipes require a minimum spacing of eighteen inches from other projections, walls, and curbs, as well as a minimum of eighteen inches out from valley waterways. Flashing details surround each pipe penetration through the roof plane. A four-inch dimension establishes localized clearance parameters around the penetration base. All penetrations must maintain these specified horizontal distances to ensure proper drainage and weatherproofing integrity.

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