Passive timber frame roof system
Natural, breathable roof system
Our Passive Roof System is designed for architects seeking uncompromising thermal performance within a refined, fabric-first design. Available in 3 depths, it achieves U-values as low as 0.10 W/m²K. The 300mm and 360mm panels meet passive design principles, while the 400mm system attains full Passive House certification. Offered in cut vaulted and flat roof configurations, it provides exceptional airtightness, design flexibility, and seamless integration with our Passive Wall and Foundation systems.
Our passive roof systems
U-value 0.13W/m²K
U-value 0.11W/m²K
U-value 0.10W/m²K
Vaulted roof build up
Performance data
| Property | Value / Information |
|---|---|
| U-value (Typical) | 0.15 to 0.10 W/m²K |
| Fire Resistance | Our passive roof has been assessed and approved by an independent structural engineer to BS EN 1991-1-2 and BS 1995-1-4 |
| Vapour Permeability | Highly breathable system / the assessment reveals no risk for condensation within the build-up. |
| Embodied Carbon | Significantly lower than conventional roof systems |
Features of our passive roof system
- Manages moisture: Reduces condensation and improves air quality.
- Natural performance materials: STEICOzell woodfibre insulation and responsibly sourced timber.
- Prefabricated panels: Off-site fabrication ensures accuracy, speed, and minimal waste. Delivering quick, weather-tight assembly for follow on trades.
- Sustainable and low carbon: ~81% woodfibre from regional, renewable forests.
Compliance & compatibility
- Compatible with: our Passive wall system, AeroSealUK's air sealing technology, AeroBarrier and our wider product portfolio.
- Standards: designed to exceed UK Building Regulations.
- STA Assure Gold certified
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