CS 77

CS 77 Aluminium Windows and Doors

CS 77 is a thermally-broken, multi-chambered system for windows and doors that offers excellent levels of security, weather resistance and thermal insulation.

The CS 77 system offers a comprehensive range of inward- and outward-opening window and door designs that are available in a range of three different styles, making it ideal for both traditional and contemporary building designs.

Combined with a huge choice of colours and finishes, and the ability to specify a different colour inside and out, the CS 77 is a truly versatile system that can be specified to compliment almost any home.

The fibreglass-reinforced polyamide strips and weather gaskets are designed with ribs and hollow chambers to achieve superior thermal insulation levels. A variant of the CS 77 has been awarded the coveted Swiss Minergie accreditation.

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If you are interested in any of the Reynaers at Home aluminium systems for your home project, we have a network of dealers throughout the UK that can advise on product choice and installation.

  • Features
  • Downloads
  • Technical information
  • Opening options
  • Variants


The CS 77 not only looks stylish but is also a great all-round performer in terms of thermal insulation, weather resistance and security:

  • Whole window U-values as low as 0.94 W/m2K
  • Up to 600 Pa air-tightness
  • Up to 900 Pa water-tightness
  • Up to 2000 Pa wind load resistance
  • RC2 and even RC3 security with UK Secured By Design security, PAS 24:2016 or BS7950 depending on window type

Style Options

The CS 77 window and door system is available in three different style options. Whether you prefer the more traditional Renaissance style or the very clean and contemporary lines of the hidden vent style, the CS 77 has the aesthetics to complement almost any home.



Min. Visible width frame: inward opening

51 mm

Min. Visible width frame-vent: inward opening

89 mm

Min. Visible width frame: outward opening

17.5 mm

Min. Visible width frame-vent: outward opening

93.5 mm

Min. Visible width T-profile

76 mm

Max. height vent

2800 mm

Max. width vent

1200 mm

Max. weight element

170 kg

Overall system depth frame

68 mm

Overall system depth vent

77 mm

Rebate height

25 mm

Min. Glass thickness

4 mm

Max. Glass thickness

52 mm

Min. Glass thickness vent

4 mm

Max. Glass thickness vent

63 mm



  • Air tightness max. test pressure

    4 (600 Pa)

  • Water tightness

    9A (600 Pa)

  • Wind load resistance

    C3 (1200 Pa)


  • Burglar resistance

    RC2/WK2 - RC3/WK3


  • Thermal insulation (Uf)

    1.2 W/m²K

Opening options


Inward opening

Outward opening



  • Functional

  • Renaissance

  • Hidden vent