why stash window

Vertical sliding window incorporates the traditional styling of sash windows with the advantages of modern thermal aluminium profile.

A traditional sash window that may be used in heritage and conservation areas where Georgian and Victorian architecture is predominate. The ease of operation and excellent natural ventilation rates means that Sash window is also suited to high occupancy buildings.

The window offers a flush opening with no projection into or out of the building, this style of window is frequently used on schools and hospitals.

Sash window hardware has been designed alongside the experts at Caldwell and utilises various standard hardware designs. As well as the vertical sliding sash, sash window features a ‘tilt in’ operation that facilitates the cleaning of the external glass.

The system features low line glazing gasket that will accept 28mm sealed units. The system can achieve overall U Values of 1.6W/m²K and a W.E.R. C rating. Our vertical sliding windows also feature concealed drainage and a concealed coupling option.

request a quantation

innovation & usp’s

  • Vertical sliding
  • Fixed
  • Tilt in operation
  • Slim line sash
  • NBS Available

size and weights

• Vertical Sliding Max Width – 1600mm
• Vertical Sliding Max Height – 2800mm
• Vertical Sliding Max Weight
• Maksymalna waga – 50kg (per sash)
• Glazing – 28mm
• Frame Depth – 126mm

thermal performance

• WER Rating –
• U Value – 1.6W/m²K (using correct glass unit)
• Air permeability – Class 5A, 200Pa
• Water tightness – Class 7A, 300Pa
• Wind resistance – Class A4, 1600Pa
• Document L Compliant Yes
• BS 6375-1:2009 Yes

configuration & options

  • Vertical sliding
  • Fixed
  • Tilt in operation
  • Slim line sash
  • NBS Available
  • Double glazing
  • Soft coat low E glass as standard
  • Argon gas as standard
  • Wide choice of colours and finishes


  • Possibility of bicolor systems
  • Color powder coating 400 colours including structure finish
  • Wood effect
  • Anodized



request a quotation

Please complete your details and a member of our team will contact you as soon as possible to discuss your requirements and provide a free, no-obligation quotation for your glazing.

    contact us

  • 3 Spa Drive, Epsom

    Phone: 07849621941