Flat Roofs
Flat Roof - Cold Roof
Knauf Insulation Flat Roof GRP TimberDeck


Cold flat roofs consist of insulating between joists, or between and below joists to meet building regulations. A cavity should be left between the insulation and the waterproofing layer for ventilation purposes. 

Often chosen for refurbishment applications, our insulation solutions for flat roof applications provide both excellent fire and acoustic performance, in addition to high levels of thermal performance.



Why Mineral Wool?

  • Mineral Wool provides the best combination of thermal, fire safety and acoustic performance.

  • When manufactured using Knauf Insulation's Krimpact® Technology it provides high levels of compressive strength and durability. It is also non-combustible, with the best possible Euroclass A1 reaction to fire classification.

    Download our Solutions Guide  U-value Tables

For any U-value calculations for alternative construction build-ups, please contact our Technical Support Team on 01744 766 666 or visit our online tool here.

For written U-value calculations, please email details of your full construction build-up to [email protected] and we will respond accordingly to meet your requirements.