Architectural · A-JJB24

Roof Penetrations Spacing and Curb Flashing Details

Materials

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

Elements

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

About this detail

Spacing layout rules for roof penetrations and equipment curbs require an 18 inch minimum clearance from valley waterways, walls, and other pipes, alongside a 4 inch minimum clearance between specific elements. The curb flashing assembly features a 2x wood curb supporting roof equipment, with unit counterflashing cut to 1 inch and base flashing secured with fasteners at 6 inches on center. A twenty-four gauge galvanized iron counterflashing insert is attached to the roof structure using three-eighths inch head screws through five-eighths inch steel and EPDM washers at 12 inches on center. Twenty-four gauge PVC-coated galvanized iron transition pieces are fabricated to match specified conditions and sealed with a urethane sealant application along the entire perimeter. The contractor must provide shop drawings to illustrate the exact proposed installation for each occurrence of this condition.

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