External Wall Insulation

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APPLICATION OVERVIEW

Important issues when specifying an external wall insulation solution include the level of thermal performance to be achieved, which finish is the most suitable and the Reaction to Fire classification of the insulation.

External Wall Insulation involves the installation of an insulating layer to the external fabric of an existing, or new building, and is usually finished with a render coat, brick slips or clad with timber boards or tiles.

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RECOMMENDED PRODUCTS

Why Mineral Wool?

  • Using a breathable mineral wool solution allows moisture vapour to pass through the construction to outside, removing the risk of condensation.

  • Mineral wool solutions are non-combustible and have the best possible A1 Euroclass Reaction to Fire classification.

Download our Solutions Guide       Download our External Walls PDF

Typical U-values
Using Rocksilk EWI Slab - Refurbishment

Thickness (mm)225mm solid brick wall (brick = 0.77 W/mk)215mm solid brick wall (block = 0.45 w/mK)
2000.170.16
1800.180.18
1600.200.20
1400.230.22
1200.260.25
1000.310.29

NOTE: Thicknesses above 120mm are bespoke and subject to availability and minimum order quantities. Contact us for more details.

Typical U-values
Using Rocksilk EWI Slab - New Build

Thickness (mm)215mm solid brick wall (brick = 0.34 W/mk)215mm solid brick wall (block = 0.19 w/mK)215mm solid brick wall (block = 0.16w/mK)
2000.150.140.14
1800.170.160.15
1600.180.170.17
1400.210.190.18
1200.230.210.21
1000.270.240.23

NOTE: Thicknesses above 120mm are bespoke and subject to availability and minimum order quantities. Contact us for more details.

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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.