The Building Centre in London
Visit our showroom in London.
Book an appointment to meet with one of our designers
and discuss your project.
Learn More
Architectural Bronze Casements,
Belton Park,
Londonthorpe Road,
Grantham,
Lincolnshire,
NG31 9SJ.
The Thermabronze™ system has been designed as a solution to the current energy saving requirements within Building Regulations, featuring a double thermal break within our characteristic slim frame for enhanced thermal performance. The frame incorporates a decorative bronze bead that secures the glass in place, double weather seals and will accept 18mm double glazed units. A range of decorative ironmongery complements the handcrafted, bespoke nature of the product
| Traditional Bead Option |
| Contemporary Bead Option |
| Double Glazing (18mm) |
| Thermally Broken Windows |
| Side Hung Unit |
| Top Hung Unit |
| Fixed Unit |
| Fixed Unit Over 1.2m2 (24mm Glazing) |
| Rebated Leg Profile |
| Equal Leg Profile |
| Vertical and/or Horizontal Glazing Bars |
| Leaded or Plain Units |
| Security Options Available |
| Optional Trickle Ventilation |
| Double Weather Seal |
| Part Q Compliant |
Side Hung Casement
| Max O/a Width | 650mm |
| Min O/A Width | 300mm |
| Max O/A Height | 1700mm |
Casements over 1100mm high will require 2 handles. Where width is greater than height, casement sash must be top hung.
Top Hung Casement
| Max O/a Width | 1200mm |
| Min O/A Width | 300mm |
| Max O/A Height | 500mm |
| Min O/A Height | 350mm |
Fixed Lights
| Max O/A Width | 1200mm |
| Max O/A Height | 2400mm |
The inclusion of opaque glazing and abutment details may alter the above performance data and design limits.
Please contact our sales team to discuss any requirements outside of the standard size limits detailed above.
U-value performance based on an 18mm double glazed unit made up of 4mm float/10mm 90% Krypton filled cavity/4mm Planitherm total + with warm edge spacers.
| Fixed casement overall value | 1.4W/m2K |
| Opening casement overall value | 1.5W/m2K |
| Centre pane value | 1.1W/m2K |
When incorporating a genuine Georgian bar add 0.4 to the U-value.
U-values calculated in accordance with BS EN iso 10077-1:2006 based upon a single fixed light sample 1230mm x 1480mm and a single opening light sample 1230mm x 1480mm.
BS 6375 Part 1
Exposure categories measured in pascals
| UK Exposure category | 2000 |
Air Permeability
| Class | 4 |
| Maximum Test Pressure | 600 Pa |
Watertightness
| Class | 8A |
| Maximum Test Pressure | 450 Pa |
Resistance to wind load
| Class | A5 |
| P1 | 2000 |
| P2 | 1000 |
| P3 | 3000 |
The above tests are carried out on side-hung outward opening windows measuring 1700m x 650mm and are tested excluding any additional security features.
Tested with scroll handles, plain backplates, manor stays and Part Q casement locks. Below test carried out on windows measuring maximum 1700mm x 650mm.
| Side opening and fixed casements. | Pass |
