Our quadruple glazed timber windows feature four layers of glass with Low-E coatings and Argon gas fill, available on both ECO 92 (92mm) and Premium 115 (115mm) engineered timber profiles. One of the highest thermal performances available on the market.
The Passivhaus standard requires windows with Uw ≤ 0.80 W/m²K. Our quadruple glazing reaches Uw 0.67 (ECO 92) and down to Uw 0.6 (Premium 115), significantly exceeding passive house requirements and making our windows suitable for even the most demanding certified passive house projects.
With 32 dB sound reduction and EI-30/45/60 certified fire resistance, the quadruple system provides comprehensive protection. Engineered for a 60-year service life.
Certified: CE, ISO 9001, ISO 14001, EU A-Class energy rating.
| Parameter | Value |
|---|---|
| Whole Window U-value (Uw) | 0.67 W/m²K (ECO 92 profile) / 0.6 W/m²K (Premium 115 profile) |
| Glass Layers | 4 (quadruple insulated glass unit) |
| Profile Systems | ECO 92 (92mm, inward tilt and turn) or Premium 115 (115mm, outward Scandinavian) |
| Low-E Coatings | Interior and exterior surfaces |
| Sound Reduction | 32 dB |
| Fire Resistance | EI-30 / EI-45 / EI-60 (certified) |
| Expected Lifespan | 60 years |
| Gas Fill | Argon |
| Timber | Engineered laminated: Pine, Oak, Meranti, or Larch |
| Paint System | Eco water-based micro-porous (RAL + NCS colours) |
| Silicone | Remmers (Germany), 18 colours |
| Gasket Colours | White, Grey, Beige, Brown, Black |
| Certifications | CE, ISO 9001, ISO 14001, EU A-Class. View all 41 certificates |
Only engineered timber is used to manufacture all windows and doors. This provides superior strength, stability and a knot-free finish.
Standard. Light, workable, excellent paint adhesion
Premium. Naturally durable, rich grain pattern
Tropical hardwood. Weather-resistant, stable
Naturally rot-resistant, strong, minimal maintenance
Eco water-based micro-porous paint. RAL and NCS colour systems. Options: lacquer both sides, lacquer + RAL, RAL both sides, different RAL each side.
Glued, exterior grills and spacers, constructional, or internal glazing bars to match architectural requirements.
Optional exterior aluminium cladding in any RAL colour. Four standard options: White, Aluminium, Brown, Bronze.
GU (Gretsch-Unitas) hardware from Germany. 5 handle models, 6 colours. Child safety locks, Trimvent smart ventilation available.
Choose ECO 92 (inward) or Premium 115 (outward Scandinavian) profile, wood species, hardware, colour - and get Uw down to 0.6 W/m²K. Precise quote in 5 minutes.
Configure This WindowECO 92 (92mm) is our inward-opening tilt and turn profile, achieving Uw 0.67 W/m²K with quadruple glazing. Premium 115 (115mm) is our dedicated outward-opening Scandinavian profile with a deeper frame, reaching Uw 0.6 W/m²K - the lowest in our range. Both profiles support all four wood species (Pine, Oak, Meranti, Larch). The choice depends on your opening direction (inward tilt-turn ECO 92, or outward Scandinavian Premium 115) and whether you need the absolute best thermal performance.
Triple glazing typically achieves Uw 0.78 W/m²K on our profiles, while quadruple reaches Uw 0.67 W/m²K (ECO 92) down to Uw 0.6 W/m²K (Premium 115) - a 14-23% improvement in thermal performance. The fourth pane adds an extra Argon-filled cavity with Low-E coating, significantly reducing heat transfer. Quadruple glazing is ideal for passive house and ultra-low energy builds.
Beyond standard quadruple insulated glass, we offer laminated safety glass (interior or exterior), sound insulation glass, fire-resistant glass (EI-30/EI-45/EI-60), and tempered glass. IN2GLASS blinds (integrated blinds within the glass unit) are also available. All options can be combined with Low-E coatings and Argon gas fill.
Quadruple glazing is available on the inward-opening ECO 92 profile (all 14 tilt-and-turn configurations C-1 to C-14) and on the outward-opening Premium 115 profile (Scandinavian-type side-swing, top-swing, and side-hung). The wider 92mm and 115mm frames accommodate the heavier glass unit while maintaining smooth operation with GU (Gretsch-Unitas) hardware from Germany for tilt and turn, and ASSA ABLOY hardware for Scandinavian windows.
Yes. Our Trimvent system provides controlled airflow without compromising insulation. The T-bar deflects air up and down, the aluminium ventilator is fully gasketed for performance, and a cord control version is available. External canopy or flat grill options match your facade design.
Our windows are certified CE, ISO 9001 (quality), ISO 14001 (environmental), EU A-Class energy rating, EI-class fire resistance, Secured by Design (SBD), UK Police Preferred Specification, Inspecta (Finland), and TÜV Eesti. EI-class fire-rated wooden windows tested to EN 16034.
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