Solid walls lose more heat than cavity walls. To reduce heat loss through solid walls – and save money on heating – you can insulate them from the outside. External wall insulation also helps you achieve more even temperatures around the house and reduce or prevent condensation on walls and ceilings.
Two of the most widely available types of external wall insulation are: best thermal value and standard.
How it works
Best thermal value is the more expensive option, but it can produce better results – although if you live in a conservation area, your local council may limit the thickness of any external insulation you install – so check first. If there are restrictions, thinner insulation can still reduce heat loss if installed correctly.
Standard insulation is the most cost-effective option. It involves rendering over panels or insulation boards, usually with a mix of sand and cement.
How it's installed
External wall insulation should be undertaken by a professional. Best thermal value and standard methods both involve the addition of a weather-proof insulating render to the outside walls of your home – usually to a thickness of 10-20mm if you choose best thermal value, or 50-100mm for standard.
*If you are unable to view our pdf booklet then please go to adobe.com and download adobe acrobat reader. It’s free of charge and will only take a few minutes to install.