Sliding Sash Spiral Balances

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.

  •     Adjustable spiral spring balance system for easy control
  •     Delivered factory finished and glazed
  •     Fire Escape options
  •     Range of moulding and fenestrations to simulate Georgian styles


Technical Details

       U Value                        Glass                     Thickness (mm)

  •        1.7                                DG                               24
  •        1.6                                DG                               24
  •        1.4                                DG                               24
  •        1.2                                DG                               24
  • FSC & PEFC Softwood
  • Hardwood (Sapele)
  • FSC Laminated Softwood
  • Optional SBD (Tilt and Slide)
  • Arches
  • Easy Clean Function (Tilt and Slide)
  • Georgian Bars/Plant on Bars
  • Bay Windows