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Serving all of the USA, Canada, Australia and the Middle East, MIFAB can provide you with the quality, engineered plumbing and drainage solutions you need. Innovative product designs save the installer time and material cost and provides the owner with higher quality cast stainless steel drains and cleanouts for the same cost as the industry standard nickel bronze. Contact us today to learn more.

All Categories  > Roof Drains  > R1100-F Series - Roof Drains with Parabolic Flow Control Weir
R1100-F Series - Roof Drains with Parabolic Flow Control Weir

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Part Number Configurator

MIFAB Series R1100-F lacquered cast iron roof drain with anchor flange, cast iron waterproofing membrane clamp ring with integral gravel stop, accuflow parabolic weir (specify -F1, -F2, -F3 for one, two or three slots), and standard self-locking polydome strainer, with a free area of 43 square inches.
FUNCTION: Used in any type of flat roofs and gutters to control the flow of rain water off of the roof. Slotted weirs reduce the volume of water to the leader. Specify F1, -F2, or -F3 for one, two or three slots to attain the required limitation of volume. 8" diameter body is ideal for applications with limited space. Dome provides for efficient drainage of rainwater and prevents debris from entering the drain line. Anchor flange and membrane clamp with tongue in groove design provides for secure grip of membrane and roof flashing materials. Flow performance per weir is 5 GPM per inch of water per slot.

Item Name

R1100-F Series - Roof Drains with Parabolic Flow Control Weir


R1100-F Series - Roof Drains with Parabolic Flow Control Weir


9.75 lbs.

Deck Opening

6 3/8" (162 mm)

Deck Opening with Sump Receiver

8 1/2" (216 mm)

Dimensional Drawing
Adjustable Strainer Type

Roof Drains with Parabolic Flow Control Weir

Load Rating
Strainer Diameter
Grate Adjustment Min.

Free Area Rating
Grate Adjustment Max.

Strainer Size
Dome Type

Standpipe Adjustment Min
Standpipe Adjustment Max
Strainer Adjustment Max
Strainer Adjustment Min
Body Size

Length (A)

No Hub Pipe Size
1321 West 119th Street Chicago, IL 60643
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Fax: 773.341.3047
E-mail: sales@mifab.com