CRS Construction

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External wall insulation

We are one of the few approved applicators of External Insulated Render Systems for all leading system manufacturers with Green Deal and ECO approval. We carry out external wall insulation to the highest standard, ensuring control, consistency and an impeccable standard of workmanship on all projects. 

Insulated render systems provide the quickest and most economical solution for increasing the thermal conductivity of a property whilst reducing condensation risks. The insulated render system allows the existing structure to retain heat better, which over time should reduce fuel consumption.



The term ‘external wall insulated render system’ refers to the installation of an insulation board bedded or dry fixed to the façade of a building, complete with render finish.

Many properties throughout the UK have been constructed with non-traditional building methods and as such are poor at retaining heat. Installing an insulated render system is an ideal method for reducing thermal leakage, reducing carbon emissions and providing a greater insulation value to a property. In addition, applying a new decorative finish will revitalise the property, often prolonging its life expectancy. All systems installed by CRS are BBA Accredited and will attract a standard 15-20 year manufacturer guarantee. Covered within this guarantee is our workmanship, which demonstrates the manufacturers confidence in our ability to deliver - No wonder CRS are one of the top installers of external wall insultaion in the UK.

There are various types of insulation board that can be incorporated into a system, depending on the substructure, namely:

  • Mineral Fibre
  • Phenolic Insulation
  • Polyisocyanurate
  • Polystyrene