Bespoke Options Slimline double glazed units available from only 11mm thick Softcoat 1.1 Low E as standard Choice of U values: 1.9 or 1.5 W/m2K on a 4mm cavity 1.4 or 1.2 W/m2K on a 6mm cavity Sightlines for listed windows from only 7mm (depending upon spacer thickness) 4mm thermal spacer available in black or white 6mm thermal spacer available in black, white or light grey Fast turnaround time Nationwide delivery in bespoke crates Wide choice of glass types Restoration glass Laminated security glass Acoustic glass Patterned or etched to name just a few... Projects Gothic sashes with 12mm Timbalite slimline double glazed units in a Grade II Listed residence in Staines, Middlesex 14mm Timbalite slimline units in sash windows and French doors to meet Part L thermal regulations in private country home residence 12mm Timbalite units in a Grade II Listed residence in Greenwich, London Conservation property in Notting Hill, London with Timbalite 14mm slimline units