External Wall insulation
External Wall Insulation
Knauf Insulation EWI Rock Mineral Wool and Blown insulation


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.

EWI (External Wall Insulation) is used on an existing building where there is no cavity to insulate, significantly improving thermal performance and reducing energy bills.

EWI 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.



  • 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 


We offer the best insulation solution for each application

At Knauf Insulation, we are committed to helping our customers meet the increasing demand for energy efficiency. Browse our other application pages to find out more.