Threshold options

Alumina bi-fold doors are available with a choice of thresholds.


Frame Only

  • 62mm high
  • To be used in conjunction with a stone cill

Low Threshold

  • 23.5mm high
  • Minimises trip hazards; ideal for family living
  • Requires no trench excavation, so is simple to install

Low Threshold and Full Ramp

  • 26.5mm high
  • Makes the low threshold Part M compliant for wheelchair access
  • Requires no trench excavation, so is simple to install

Frame and Cill

  • 92mm high
  • The most common threshold option for the majority of building types.

Low Threshold and Half Ramp

  • 26.5mm high
  • Enables the interior flooring to be fitted flush to the doors
  • Requires no trench excavation, so is simple to install

Fully weather tested

The Alumina thermally broken low threshold has been weather tested on a full sized, 2.5m high bi-folding door, achieving fantastic results – read more here.


More options

Colour Options

Discover the wide range of colours and finishes available with Alumina bi-fold doors.

Door Styles

Find out more about the styles and configurations available.

Choosing a Bi-Fold door

Here are a few guidelines on what to consider when choosing a bi-fold door.