Insulating your solid walls could cut your heating costs considerably because solid walls let through twice as much heat as cavity walls do. The good news is they can be insulated – from the inside or the outside.
If your home was built before 1920, its external walls are probably solid rather than cavity walls. Cavity walls are made of two layers with a small gap or ‘cavity’ between them. Solid walls have no such gap, so they let more heat through. Solid walls can be insulated – either from the inside or the outside. This will cost more than insulating a standard cavity wall, but the savings on your heating bills will be bigger too.
External wall insulation:
- Can be applied without disruption to the household
- Does not reduce the floor area of your home
- Renews the appearance of outer walls. Coloured finishes can be applied to save redecoration costs in the future
- Improves weatherproofing and sound resistance
- Fills cracks and gaps in the brickwork, which will reduce draughts
- Increases the life of your walls by protecting the brickwork
- Reduces condensation on internal walls and can help prevent damp (but will not solve rising or penetration damp)
- May need planning permission – we always check this with your local council
- Requires good access to the outer walls
- Is not recommended if the outer walls are structurally unsound and cannot be repaired.