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01 Thermal Efficiencies

EWI Pro systems not only improve the look of the property; they also vastly improve thermal efficiency, resulting in lower energy bills.

Energy Saving and EWI Pro

With ever-increasing energy prices, and in today’s environmental climate, insulation is essential. EWI pro systems can be retrofitted onto the building, and have time and again solved the problem of solid wall properties; our systems can easily bring the thermal efficiency of the building fabric up to the highest of standards.

U-value Thickness of insulation (mm) attached to 215mm solid brick wall Requirement
w/m2kEPS (mm)Mineral Wool (mm)XPS (mm)Wood Fibre (mm)
0.3090110110100Refurbishment
0.28100120120120Extensions
0.18170200200200New build
0.15210270*250*240*PassivHaus
* Made up of 2 layers of insulation

The thicker the insulation used in the external wall insulation system, the bigger the energy savings. Our most cost-effective external wall insulation system uses EPS as the insulation material. The table to the left illustrates the required thickness of different insulation materials when looking to achieve specific U-values.

Thermal conductivity variations between insulation materials:

The thicker the insulation used in the external wall insulation system, the bigger the energy savings. Our most cost-effective external wall insulation system uses EPS as the insulation material. The table on the right illustrates the thermal conductivities of our full insulation range.

Insulation TypeThermal Conductivity (W/mK)
Grey EPS 700.032
Rockwool DD Insulation0.036
XPS0.038
Wood Fibre0.041
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