Box Sash

All Timber Windows Norfolk Window products are manufactured to the highest quality, and have 60 Years+ Service Life, under Low Maintenance regime up to 80 in less exposed areas. When you choose our high specification Timber Windows, you can be sure that they will provide Style and Endurance for years to come. Due to the modern manufacturing process and the Service Life, TWN’s Windows are Carbon Negative. Our products are designed to save money and CO², whilst meeting and Exceeding, the Energy Efficiency Standards in the UK Building Regulations Recommendations.

The Vertical Sliding Sash Window offers the best of both worlds – the appeal of traditional construction and styling combined with the benefits of modern timber technology. The result is a high performance window that is ideal where aesthetic values are critical.

  •     Pendulum style cords and weights system for easy operation
  •     Delivered factory glazed and finished
  •     Meets planning requirements for sensitive locations
  •     Fire Escape options
  •     A Range of moulding and fenestration styles to simulate Georgian styling.
  •     Optional inward opening sashes for easy, safe cleaning

Technical Details

       U Value                        Glass                     Thickness (mm)

  •        1.3                                DG                               26
  •        1.6                                DG                               24
  •        1.4                                DG                               24
  •        1.2                                DG                               24
  • FSC & PEFC Softwood
  • Hardwood (Sapele)
  • Georgian Bar/ Glazing Bar
  • Plant on Astragal Bar
  • Bay Window
  • Easy Clean Function