External Wall Insulation – Flexible (Bostik)

The system is ideal for refurbishment work, offering a range of finishes and flexible selling system backed by a comprehensive training scheme.

Suitable for:

  • New build

  • Retrofit

Technical information

The system is ideal for refurbishment work, offering a range of finishes and flexible selling system backed by a comprehensive training scheme.

For a wall make up of 100mm of Knauf EWI Slab, 110mm White Jablite or 90mm Grey Jablite EPS insulation, the typical u-value achieved will be – 0.30W/m²K, complying with current Building Regulations (2010). This system has been designed to improve the thermal efficiceny.

Insulation boards are adhered to the existing substrate using the adhesive, allowing each board to be levelled. Once the adhesive has dried, typically five mechanical fixings per board are installed through the insulation into the solid brickwork. The insulation is made watertight and robust with one to two layers of reinforcing mesh embedded with two layers of base coat. The desired finish is then applied.

Around reveals, sills and heads, affix 30mm of insulation, then apply the render finish. This will reduce any possibility of thermal bridging.

The Bostik Climatherm system comes in a variety of different finishes from Brick effect, Dash, Silicone and Acrylic render.


How to install

Bostik Climatherm External Wall Insulation (EWI) is a composite cladding system that can significantly improve heat retention within a building.

The system uses insulation, polymer based renders and a variety of waterproof finishes designed to replicate the existing finish of your home.

Only accredited installers can legally use this system. Our video shows you the steps involved.



Hints & Tips

Planning Permission may be required and to check with you local authority to confirm this.

If windows haven’t been replaced for some years, it may be an idea to change prior to the EWI system being installed.

We can offer training courses through our training provider, PPL.

A full survey must be undertaken, to ensure the property is suitable for External Wall Insulation

This system must be installed by an accredited installer.

This system is BBA approved.