Flat Roofs
Flat Roof

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APPLICATION OVERVIEW

Our insulation solutions for flat roof applications provide both excellent fire and acoustic performance in addition to high levels of thermal performance.

Loading and impact resistance is also required, with compressive strength being an important consideration when selecting flat roof insulation solutions.

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RECOMMENDED PRODUCTS

Why Mineral Wool?

  • Mineral wool reduces the drumming effect of rainwater on lightweight roofs and significantly improves acoustic performance.

  • Using a non-combustible mineral wool insulant contributes to an effective fire safety strategy.

Download our Solutions Guide  Download our Flat Roofs PDF

Typical U-values
Using Rocksilk Krimpact Flat Roof Slab with single ply membrane

Rocksilk Krimpact Flat Roof Slab Thickness (mm)150mm concrete, 40mm screed, 13mm plasterProfiled metal deck19mm chipboard, 100mm timber joists, 12.5 mm std plasterboard
245 (145 + 100)0.150.150.14
200 (2 x 100)0.170.180.17
1800.200.200.19

Typical U-values
Using Rocksilk Krimpact Flat Roof Slab with mastic asphalt waterproofing

Rocksilk Krimpact Flat Roof Slab Thickness (mm)150mm concrete, 40mm screed, 13mm plasterProfiled metal deck19mm chipboard, 100mm timber joists, 12.5 mm std plasterboard
245 (145 + 100)0.150.150.14
200 (2 x 100)0.180.180.17
1800.200.200.19
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For any U-value calculations for alternative construction build-ups, please contact our Technical Support Team on 01744 766 666.
For written U-value calculations, please email details of your full through construction build-up to technical.uk@knaufinsulation.com and we will respond accordingly to meet your requirements
We are a fully accredited member of the industry leading British Board of Agrément (BBA) U-value and Condensation Calculation Competency Scheme which promotes and assists accurate, objective and consistent calculations of U-values and condensation calculations within the UK construction industry. As part of our ongoing participation in the scheme, we are required to maintain written records for audit trail purposes.