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What exactly is external wall insulation?

External wall solutions comprise of an insulation layer fixed to the existing wall, with a protective render or decorative finish. Dry cladding offers a wide range of finishes such as – timber panels, stone or clay tiles, brick slips or aluminum panels.

External wall insulation is a great way to protect against penetrating damp, creating a new weatherproof layer on the outside of the building, and slowing the movement of heat through the walls.

External wall insulation is a great alternative when looking to improve the insulation of a building, reducing heat loss and improving the building envelope.

If your home was built before the 1920s, it's likely the external walls are solid walls rather than cavity walls.

  • Solid walls have no gap, so they can’t be filled with cavity wall insulation.
  • Cavity walls are made of two layers with a gap or ‘cavity’ between them.

Solid walls can be insulated by adding an insulating layer, either on the inside or the outside, to prevent heat escaping through your walls while keeping the cold out.

This will cost more than insulating a cavity wall but the savings on your heating bills will be bigger too.