Products / MIFAB R1100-F Roof Drain with Adjustable Parabolic Weir

The R1100-F series is MIFAB's flow-control roof drain: a lacquered cast iron body with an anchor flange, a cast iron waterproofing membrane clamp ring with an integral gravel stop, an Accuflow parabolic weir adjustable up to 15 GPM per inch, and a self-locking polydome strainer with 43 sq. in. of free area, per the product page's specification text. It is listed in MIFAB's 2025 specification drainage catalog (MPB-2025-04-USA).