The non-trafficable roof, and the best-performing element in the set thermally at U 0.21 W/m²K. It is also the lightest against its traditional equivalent: 102 kg/m² against 443 kg/m², a 77% reduction. Joist depth varies with span, which moves the total build-up between 503 and 653 mm.
Non-trafficable roof
603 mm
Total thickness · D.08
The layer schedule for this detail is being transcribed from the construction details catalogue and signed off by the technical department. The total thickness above is confirmed. Contact the technical department for the current build-up on a live scheme.
Layer schedule
The layer schedule for D.08 is being transcribed from the construction details catalogue and signed off by the technical department. The confirmed total thickness is 603 mm.
Performance
| Property | Value | Basis |
|---|---|---|
| U-value, bridging corrected | 0.21 W/m²K | EN ISO 6946, one-dimensional steady state, with a +15% bridging correction for horizontal elements, applied as an engineering estimate. |
| Self-weight | 102 kg/m² | Mass estimate from the layers and dimensions in the source document. |
| Traditional equivalent | 443 kg/m² | Derived from the published self-weight and reduction percentage. |
| Weight reduction | 77 % | Self-weight against the traditional equivalent build-up. |
| Fire resistance (EI) | Test programme in progress — contact technical department | Awaiting laboratory test report |
| Airborne sound reduction (R_A) | Test programme in progress — contact technical department | Awaiting laboratory test report |
| Structural span | Test programme in progress — contact technical departmentSpan selection tables in preparation | Awaiting laboratory test report |
| Watertightness | Test programme in progress — contact technical department | Awaiting laboratory test report |
U-values are one-dimensional steady-state calculations to EN ISO 6946. Bridging correction is applied as an engineering estimate: +20% for walls, +15% for horizontal elements. 2D numerical analysis to EN ISO 10211 is in progress; values will be updated on completion.
Not yet stated
- EIFire resistance · in test
- R_AAirborne sound reduction · in test
- spanStructural span · in test
- watertightnessWatertightness · in test
Test programme in progress — contact technical department