There are a number of systems which can be used to insulate the exterior of a house. The usual process is:

1. an insulation slab is fixed mechanically to the wall
2. a web is paced over this
3. a polymer based weatherproof render is applied

The contractor pays attention to details such as windows sills and window surrounds to ensure the façade of the house is unchanged.

Depending on the amount of insulation applied, the insulation of the house will increase dramatically.