Solid Wall Insulation can save energy and money
Have my neighbours done this?
What is it?
An effective method of reducing the heat lost through solid walls
What will it save me?
Up to 80% of the heat lost through your walls, possibly £400 per year
How do I get it?
This is a job for a builder or specialist contractor
What does it cost?
Possibly over £10,000 depending on the house and the method chosen (2013)
What are the technical details?
Older buildings normally have solid brick or stone walls but even thick walls offer little resistance to heat loss. Some more modern structures such as homes built with solid concrete and non-standard system building techniques can be even worse. Either way, they can be insulated on the inside or outside surface of the wall with care to prevent condensation issues within the wall and may not be permitted for listed buildings or conservation areas.
a. External wall insulation usually takes the form of a manufactured system mechanically attached to the outside of the wall. This will consist of an insulation layer (usually 60-100mm thick) covered with an acrylic render. This can reduce heat loss through the wall by up to 80% and the finish can be created to match the original wall finish including using brick slips if needed.
This is a specialist contractor job to remove all external wall fittings and replace them afterwards. In conservation areas, planning permission will be required and is unlikely to be permitted for listed building.
b. Internal wall insulation will usually require insulated plasterboard (dry-lining) to be mechanically fixed to the inside face of the wall. This can be fixed to battens on the wall or directly to the wall. The insulation will normally be at least 50mm thick and it's normal to use foil faced insulation boards joined with foil tape to act as a vapour barrier to prevent condensation issues within the wall. This can also reduce heat loss by 80% depending on the insulation thickness.
This job is best left to a builder because skirting boards and electrical fittings may need to be repositioned after the inner wall has been improved.
c. Internal flexible lining can be used as an alternative to dry-lining to save space and create less disruption. Watch the video at the link below:
The lining used is normally a 10mm thick flexible foam rubber type of material with a reinforced surface that can be decorated over. It‘s fitted in a similar way to wall paper although bigger and heavier. It isn’t as effective as insulated dry-lining but can reduce heat loss by around 25%.
This could be a DIY job although it's more difficult to fit and get a good finish than wall paper. Most people would need a professional decorator.
Watch a video of External Wall Insulation being added to homes in Brinklow, Rugby.