GBS-98 has very low U values suitable for ultra-low energy builds including Passivhaus and EnerPHit projects. Still offering FSC® certified timber, this frame delivers the triple glazing technology for the most energy efficiency projects. 98 refers to the increased depth of the window frame.
Links to technical drawings, PHPP 10 information and declarations can be found on our technical page.
Due to the complexity of specifying our products, we have a minimum order policy. To realise the benefits of triple glazing, including the continuity of thermal performance, we only recommend replacing windows throughout all of your home for replacement or retrofit projects.
Outward opening
A flush casement window hung from the top or side.
- U value: 0.73 W/m2K
- Triple unit: Argon fill 56mm
- Light transmission value: 73%
- Triple glazed as standard
Inward opening
Tilt and turn window options.
- U value: 0.71 W/m2K
- Triple unit: Argon fill 56mm
- Light transmission value: 73%
- Triple glazed as standard
Tend to be single doors, usually inward opening. A range of options are available.
- U value: 0.84 W/m2K
- Inward and outward opening entrance doors
- A range of standard and contemporary designs
- Aluminium-clad doors available
- Insulated frame option
- Dual compression seals for long-term airtightness
- Secured by Design option
Available as inward or outward opening double doors.
- U value: 0.80 W/m2K
- Inward and outward opening entrance doors
- A range of standard and contemporary designs
- Aluminium-clad doors available
- Insulated frame option
- Dual compression seals for long-term airtightness
- Secured by Design option
One of the most energy efficient lift & slide doors available in the UK.
- U value: 0.75 W/m2K
- Ideal for low energy retrofits and newbuilds
- One pane of the door slides behind the other, with options for one pane or both panes sliding
- Dual compression seals for long term airtightness
- CAD drawings available on request
- Maximum size 2200mm x 2400mm
- Triple glazed as standard
