The roof insulation thickness will vary dependent on the required U-Value. The below table shows the thickness of insulation required for a typical warm roof construction with insulation fitted above the rafters. Our U-value calculator is free and simple to use for calculating U-Values specific to your roof construction design.
|Quinn Therm QR Insulation (mm)|
|U-Value (W / m2K)||0.19||0.17||0.16||0.16||0.15||0.14||0.13|
U-value results above based upon pitched roof construction shown:
150mm deep rafters @400mm centres; Quinn Therm QR; vapour open underlay; 38mm cavity formed by counterbattens; large format concrete tiles. Calculations performed to BS EN ISO 6946, taking account of repeating thermal bridges.
Cavity Wall Insulation
Solid Wall Insulation
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