
Our best-selling cost-effective triple glazed timber inward opening tilt and turn window. Uw value 0.85 W/m2K.
IV78
- Inward opening (outward opening also available)
- High performance triple glazing
- FSC® certified timber in redwood & oak
- FSC® certified Accoya timber drip rail for durability
- Alu-clad option available
- Dual compression seals for long-term airtightness
- Secured by Design option
- 78mm profile
- Made exclusively for Green Building Store by our partners in northern Europe
Installation Gallery
Timber Window Gallery
Alu-clad Window Gallery
Window style options (many others available)
Glazing & U values
Whole window U Value: Uw 0.85 W/m2K (Redwood)
Whole window U Value: Uw 0.94 W/m2K (Oak)
Glazing U value:: Ug 0.58 W/m2K
Triple unit: Argon fill 44mm
Light transmission value: 74.1%
Typical maximum sizes
Tilt & turn: 1300 mm X 2300 mm
Tilt only: 2000 mm X 950 mm or 1300 mm X 2300 mm
Please note: For Part Q and Secured By Design items, there may be size restrictions. Please get in touch to discuss.
Test results
Air Permeability BS EN 12207: 600 Pa Class 4
Water tightness BS EN 12208: 600 Pa Class 9A
Wind load BSÂ EN 12210: 2400 Pa Class E2400
Exposure category BS 6375-1: 2400
* U values calculated for standard single window 1230 X 1480
Glazing Options
Redwood Colour Options
Oak Timber Stains
Handles
Most handles are compatible with our windows and doors so if you are looking for something a bit different to what is shown please get in touch with the windows team and we will be able to find something to suit your needs.