Large inverted roof drain assembly threaded outlet


Frost Roof drain assembly - inverted roof with clamp, fixed polycarbonate dome 220mm and 150mm gravel guard, large cast-iron sump body with vertical outlet size 4' BSP. Rainwater outlets with domed gratings are suited to inverted roof construction where the waterproof membrane is located above the roof deck but below the insulation layer. The stainless steel gravel guard prevents ballast from entering the drainage system during maintenance. Gravel guards higher than 150mm are available.

  • Body Material

    Cast Iron

  • Grating Material


  • Outlet Type


  • Analytical Flow Rate based on 35mm head of water (L/s)


  • 3D CAD File


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