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HiFlow Roof Drain — 50mm

Aquaknight Membrane Roof Drains are a hi-flow capacity, uPVC outlet with a stainless steel domed lid and a stainless steel, interlocking clamp ring. The fittings have an appropriate clamping thickness range and force, for all modern membrane systems.

Available in side exit or bottom exit, with a big flange.

  • FLowLab test reports available for each variation
  • Inlet sizes: 100mm
  • Outlet size: 50mm
Key Features
  • FlowLab tested
  • Engineered clamping range 0-10mm membrane thickness for single-ply, multi-layer and torch-on systems
  • Side or bottom exit
  • Big flange
  • Stainless Steel domed lid
  • Overflow insert included — can be either a drain or an overflow
  • M6x25 machine screws for sound installations
  • Stainless Steel interlocking clamp ring — engineered for life
  • Over-moulded custom machine nuts — cannot be 'cranked out' and will not yield over time
NZ Made
NZ Made
Scope of Use
  • Suitable for use as outlets and/or overflow drains in conjunction with a variety of modern waterproofing membrane systems:
    • single-ply sheet membranes
    • torch-on membranes
  • Side or bottom exit
  • Large flange for general application
  • Engineered clamping range 0-10mm membrane thickness; suitable for single-ply, multi-layer and torch-on
  • Residential and commercial applications
  • All corrosion zones as defined in NZS 3604:2011
Limitations on Use
  • Not to be used where membrane build-up exceeds 10mm in clamping area
  • For micro-climates as defined in NZS 3604: 2011, contact Aquaknight for material selection information
  • For use with monolithic hot-melt membranes, consult membrane supplier
NZS 3604 Corrosion Zone B suitable
Corrosion Exposure Zone B
NZS 3604 Corrosion Zone C suitable
Corrosion Exposure Zone C
NZS 3604 Corrosion Zone D suitable
Corrosion Exposure Zone D
Statement of Building Code Compliance

If designed, installed and maintained in accordance with Aquaknight Industries’ requirements, the Aquaknight Roof Drain will meet or contribute to meeting the following provisions of the NZBC:

  • B1 Structure B1.3.1, B1.3.2, B1.3.3 (a, b, c, j)
  • B2 Durability B2.3.1 (b)
  • E1 Surface Water E1.3.3 (a, b, c, d, e, f)
  • F2 Hazardous Materials F2.3.1
In-Service History

Used with most membrane waterproofing systems extensively throughout New Zealand for over ten years.

Other Performance Attributes
  • Flow rates vary between product models, consult individual FlowLab reports to establish exact flow rates
  • Stainless steel interlocking clamp ring — tested as fit for purpose and endorsed by Waterproofing Membrane Association Inc.
  • Over-moulded custom machine nuts — cannot be 'cranked out' and will not yield over time
  • M6 machine screws for positive clamping torque

Warranty and Maintenance

Warranty for exterior membrane drainage outlets: 

Free from defects of material and workmanship for 15 years. Tea staining may occur over time. This is not considered a material defect and is not covered under warranty terms.

Maintenance for exterior membrane drainage outlets: 

Regular inspections (at least monthly, and after every significant storm) should be conducted to remove any accumulation of debris from box-gutters, sumps and around the drain areas. Accumulation of such material can lead to blocked drains and overflow events. The overflow outlet discharge pipes should be monitored during rain events. Any water discharge is an early warning that may indicate a partially blocked drain.

E1 Surface Water compliant
Surface Water
CAD & Revit Downloads
PASS Product Statement: Aquaknight Roof Drains

PASS no. 19026

FlowLab Testing
Warranty: Membrane Drainage Fittings


All Roof Drains — Product Reference Chart
Roof Drain 50mm Bottom Exit, Big Flange
Roof Drain 50mm Side Exit, Big Flange

Aquaknight offers premium drainage solutions for all modern membrane types: liquid, single ply, multi-layer, torch-on and monolithic.

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