Cortizo Aluminium Window System | Altegra

Cortizo Aluminium
Casement Window System

With a modern aesthetic of straight lines, it has profiles tailored for residential and commercial projects, and both for new build and renovation.

The Cortizo casement is a slimline aluminium window system available with side hung and top hung outward openings, fabricated from high grade thermally broken aluminium.

This system is highly efficient, with a thermal break zone of 32 mm and a transmittance Uw from 1,0 W/ m²K, has the British security certification PAS 24. 

Available in standard and flush profile, and as slimline or heavy duty sashes to
accommodate a variety of sizes. The frame depths of 70mm provide slim, contemporary frames that allow for more glass surface and more natural light into your building.

This casement window system is ideal for both residential and trade markets, equally for refurbishment or new build projects.

Features and benefits

  • Narrow sightlines
  • Great insulation due to polyamide thermal break technology
  • Slimline and heavy duty sashes available to accommodate different size windows
  • Available in flush profile
  • Available with security hardware and concealed hinges
  • Double glazing as standard with triple glazing available
  • Wide range of finish options with dual-colour available
  • Tested to the stringent PAS 024: 2012
  • Full range of frame couplings, bay window attachments and sills.
  • Polyester powder coat or anodised frame finishes including dual colour
  • Frames can be finished in wide variety of RAL colours, anodised, anti-bacterial, textured, anodised or even wood effect finished.

Why choose a Cortizo Casement Window?

  1. Energy efficiency: Cortizo casement windows are designed to minimize heat loss and maximize energy efficiency. They use advanced sealing systems and insulating materials to keep your home comfortable and energy bills low.

  2. Security: Cortizo casement windows are equipped with robust locking mechanisms that provide superior security and prevent unauthorized entry.

  3. Aesthetics: Cortizo casement windows have sleek, modern designs that can enhance the appearance of your home. They come in a variety of colors and finishes, making it easy to find the perfect match for your home's decor.

  4. Durability: Cortizo casement windows are made with high-quality materials that are designed to withstand the elements and last for many years. They are resistant to corrosion, rot, and decay.

  5. Ease of use: Cortizo casement windows are easy to operate, with a smooth and effortless opening and closing mechanism. They are also easy to clean and maintain.


Cortizo Standard Casement Window

Standard Version

Cortizo Casement Window Flush

Flush Version

  • Technical Specifications

  • Finishes

  • Openings

Typical Sizes

Sections Frame 70mm, Sash 70mm
Polyamide Strip Length 32mm
Profile thickness 1.6mm


  Width (mm) Height (mm)
Slim Sash Side Hung 700mm 1300mm
Slim Slash Top Hung 1200mm 1300mm
Heavy Duty Sash Side Hung 750mm 1750mm
Heavy Duty Sash Top Hung 1800mm 1800mm

For guidance only - when exceeded please consult our technical department.


Side Hung Slim Sash 35 kg
Top Hung Slim Sash 50kg
Side Hung Heavy Duty Sash 42kg
Top Hung Heavy Duty Sash 100kg


Weather Rating

BS 6375 Part 1

Air Permeability (EN 12207) Class 4
Water Tightness (EN 12208) Class E1200
Wind Resistance (EN 12210) Class CE2400

Maximum tightness: CLASS E1200, 
which means during 75 minutes, total affluent of 450 litres and wind velocity of 161 km/h, there´s no water 

Noise protection: up to 45 dB acoustic reduction

It has an excellent energy efficiency: 
window transmittance from 1,0 (W/

Reference test 1.438 x 1.355 m / 1 sash + 1 fixed light


Glass thickness Max 44mm, Minimum 23mm

Available in double or triple glazing option


  • Narrow sightlines: Frame 70 mm, Sash 70 mm
  • Wide variety of profile and design options in standard and heavy duty option
  • Available in flush profile
  • Opening possibilities: Outward opening, Side hung, Top hung
  • Profile thickness: Window 1.6 mm
  • Polyamide strip length: 32 mm


  • Full range of frame couplings, bay window attachments and sills.
  • Polyester powder coat or anodised frame finishes including dual colour
  • Frames can be finished in wide variety of RAL colours, anodised, anti-bacterial, textured, anodised or even wood effect finished.
  • Security hardware.
  • Concealed hinges.

Cortizo opening


Standard Trade Colour Range

White (9016): Offering a more traditional look to match existing window frames.

Anthracite Grey - RAL 7016: The classic aluminium bifold door colour for that ‘Grand Designs’ look.

Jet Black - RAL9015: Perfect for a more sophisticated, contrasting colour option or a more contemporary finish.

Dual Colour Range

White / Anthracite

Anthracite / White

Dual colour available

Our Aluminium Windows are available in a wide variety of standard or non-standard colours, including dual colour where you have a choice of the same colour inside and out. If you have a specific colour in mind, we can colour match for a bespoke solution.

Variety of glass types

We are able to provide an extensive array of customisable glass options for you to choose for your aluminium system.

Made to measure

Every aluminium window system which we design is made to match our customers exact requirements. We have a dedicated in-house team to help with this.

Extensive product range

We are able to design standard and bespoke aluminium windows suitable for all types of customers.

Explore how Altegra can maximise durability and product lifespan

Learn more about what Altegra Window & Door Systems have to offer by booking a meeting with one of our team members, or by enquiring via the contact form. Once you submit the enquiry form, it will be passed to a member from our team, then they will contact you promptly.


Enquire for your free no-obligation quotation

Contact Altegra Window & Door Systems today to set up a free trade account for all aluminium window and door systems.