Modi Drain 3 in. One-Piece No-Weld Flat Roof Drain

The Modi Drain is a new concept in flat roof drainage, easily suitable for every application from new construction to reroofing and roof maintenance. It is manufactured specifically for use with modified bitumen membrane (APP or SBS) and BUR roofs. This listing is one 3 in. drain (EA), sold as a single piece.

Key Features:

• One-Piece Build: One-piece (no-weld) construction eliminates the possibility of leakage.
• Ribbed Flange: The ribbed flange face ensures positive adhesion to the waterproofing membrane.
• Angular Seal Rings: The press-fit spigot includes two angular seal rings that prevent damage to the waterproofing system due to hydraulic jump and vapor penetration.
• Mod-Bit Ready: Manufactured specifically for use with modified bitumen membrane (APP or SBS) and BUR roofs.
• Versatile Use: Suitable for new construction, reroofing and roof maintenance applications.
• 3 in. Outlet: This variant has a 3 in. outlet size.

Specifications Table:

Coverage & How Much You Need:

One drain serves one drainage point in a flat roof assembly. Size the number of drains per roof area according to your project’s drainage requirements.

Fit and Compatibility:

Manufactured specifically for use with modified bitumen membrane (APP or SBS) and BUR roofing systems. Membrane, flashing materials and drain clamps or connectors for the outlet piping are sold separately.

Frequently Asked Questions (FAQ):

Q: What is included?
A: One 3 in. Modi Drain (sold each); membrane and outlet piping are sold separately.

Q: Which membranes is it for?
A: It is manufactured specifically for use with modified bitumen membrane (APP or SBS) and BUR.

Q: Why no-weld construction?
A: The one-piece, no-weld construction eliminates the possibility of leakage at the drain body.

Q: What do the seal rings do?
A: The press-fit spigot’s two angular seal rings prevent damage to the waterproofing system due to hydraulic jump and vapor penetration.

Q: Can it be used in reroofing?
A: Yes, its design suits new construction, reroofing and roof maintenance.

Expert Verdict Reviewed by the SuperArbor Pro Desk

The ribbed flange face is designed for positive adhesion, so ensure the membrane is fully mopped or adhered across the flange for a watertight tie-in. Press the spigot fully home so both angular seal rings engage, protecting against hydraulic jump and vapor penetration. This drain suits APP or SBS mod-bit and BUR systems; confirm the outlet size matches your interior plumbing before ordering.

Roof drain installation should follow the manufacturer’s instructions and applicable plumbing and roofing codes, with proper fall protection while working on the roof.

Order the Modi Drain 3 in. for leak-resistant, no-weld flat roof drainage.