ALU Casement Window

Aluminium Window

The Alumen Casement window is a modern, contemporary style window that features a 70mm deep thermally broken outer frame profile. Available in a slim or heavy duty sash profile and glazing depths of upto 44mm the casement is the perfect choice for residential or commercial projects.

  • Whole Window U values as low as 1.1 W/m2K achievable
  • Max Sash Size of 1800mm x 1800mm
  • Maximum Sash weight = 100Kg
  • Top Hung or Side Hung Open Out Openings available
  • Wide range of RAL colour options available including dual colour
  • Stock colours available in White & Anthracite Grey (RAL 7016 MATT)
  • Tested to Security Standard PAS 24:2016
  • Maximum accoustic insulation Rw = 45dB
  • 10 Year Guarantee on frames

Slim Sash

Cortizo Casement Slim Sash

Slim Sash Cross Section

Cortizo Casement Slim Sash

Heavy Duty Sash Cross Section

Cortizo Casement Heavy Duty Sash


The following profiles are the main profiles that we use as standard.

Outer Frame

70mm base width profile used as standard.


Internally beaded squareline sash used as standard.

NB in order for the window to be completely internally beaded all aperatures must either be a sash or dummy sash.


Squareline bead for 28mm units used as standard. Chamfered beads available upon request.


Choice of 85mm Stub cill, 150mm, 180mm or 230mm.


38mm add-on is available.

Trickle Vents

Trickle vents are normally fitted into the frame.

Where trickle vents are fitted in the frame, an add-on is used.

Option to fit trickle vents into the Heavy Duty Sash.