Traditional single layer 432mm wide segment installations will not meet the new H1 changes. Segments fitted between truss chords create a ‘thermal chimney’, allowing heat loss into the ceiling space. Claims over-width insulation segments ‘ballooning’ over truss chords are theoretically effective. However, with a congested roof space including struts, can significantly undermine performance. As R-values increase and thermal bridging is more robustly calculated, this heat loss cannot be adequately offset.
Comfortech® have developed a single layer Pink® Superbatts® R7.0 solution, at a new width of 460mm, segments can be notched and fitted between the truss chord to seal the thermal bridge.
For compliance using the:
- Schedule method, use Pink® Superbatts® R7.0
- Calculation and Modelling methods may determine a lower R-value is required. Comfortech® has a range of other R-values including Pink® Superbatts® R4.5, R5.0, R6.0 which will all be at the new width of 460mm.