Cut Your Heating Costs Today

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.Internal wall insulation is done by fitting rigid insulation boards to the wall, or by building a stud wall filled in with insulation material such as mineral wool fibre. Solid wall insulation may be suitable for a variety of property types such as brick, stone, steel-framed and concrete construction.

Internal solid wall insulation works by adding a thermal layer of material to the existing wall. Solid walls can be insulated internally (from the inside) and externally (from the outside). Both are significant undertakings in terms of cost and disruption but both options can make your home warmer and greatly reduce your heating bills at the same time.
Internal solid wall insulation, rather than external, is particularly appropriate where you need to maintain the external appearance of the building (e.g. in a heritage context)

Types of Internal Solid Wall Insulation

There are various ways to insulate a solid walled building from within, but they broadly fall into three categories:

1) Rigid insulation boards
These come in a variety of materials and thicknesses and deliver the highest energy saving. Some have pre-attached plasterboard which makes the installation process more straightforward.

2) Dry lining
Battens are fixed to the walls, insulation is fitted between them and then covered with plasterboard. This is a good option if the wall has a lot of heavy fittings such as book cases or kitchen cupboards, or if the original wall is rough and uneven, as in some stone properties.

3) Flexible thermal lining
This comes in rolls like thick wallpaper and is glued to the wall using a special adhesive. Flexible linings may not provide the same level of insulation but you could install the material yourself if you are a competent DIYer. Moreover, as flexible linings tend to be no more than 10mm thick they can be a good option for rooms that have limited space.

Average Cost and Savings

Internally insulating your home will probably cost between £5,500 and £8,500, depending on how many rooms are being renovated and the type of material being used. Generally this is less expensive than external solid wall insulation because of the lower cost of materials and labour. A typical 3-bedroom semi-detached house using gas heating could save around £260 per year on heating bills by installing internal wall insulation whereas a detached house heating with oil could save around £450 per year.

A cut-away model of internal solid wall insulation.

A cut-away model of internal solid wall insulation.

1 | Surface coating (green)

This is the new plasterwork that covers the insulation layer. Just like a normal internal wall, it can be painted (green in this case) or papered

2 | Insulation (orange)

This is the layer that prevents warmth escaping through the outside walls of the house. In this case, rigid insulation boards have been used.

3 | Internal wall (white)

This is the old internal plaster which is now covered by the new insulation board and plasterwork.

4 | Windows

Ideally, the insulation board is fitted to the inside of the window recess to prevent cold patches developing where condensation forms. But, as is the case here, this is not always possible.

5 | External wall (brickwork)

From the outside, your property will look exactly the same.

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