Solid Wall Insulation
What is solid wall insulation?
Houses built before 1930 and some in later years typically have solid masonry walls. Heat loss through the external walls is on average 35%. Solid wall insulation is a way of preventing energy waste and cutting up to 25% of the fuel bills. In addition to its weatherproofing benefits, where the building fabric of older houses is in a poor state of repair, solid wall insulation can deal with both the structural and aesthetic issues.
External wall insulation
The design and installation of external wall insulation is a specialist job. It is strongly recommended to use certified materials and components. The typical method includes attaching standard size insulation boards to the wall and finishing with a reinforced render or cladding. The boards are between 40-90 mm thick, fixed to the wall with adhesive and mechanical fixings. The total thickness of the insulation is 50mm to 150mm. For most cost-effective results this should be done as part of other renovation work.Internal wall insulation
Also referred to as dry-lining, this type of insulation involves applying a 25-50 mm insulation layer on the inside of external walls covered with plasterboard fixed with adhesive and possibly metal fasteners. The thickness is 40mm -100mm.
Planning permission
External insulation requires a planning permission since it changes the appearance of a house. This is particularly relevant in conservation areas. You should call your local council to check on local policy.
Internal insulation does not require a planning permission.
CostsExternal solid wall insulation –The cost of insulated render/cladding is around £45 to £65 per square metre, depending on the selected product, installer, the condition of the exterior surface and its complexity. Since the whole house needs to be insulated using this method, minimum costs start around £2000. A typical semi-detached house with some 80 m2 of walls is likely to cost between £3,500 and £5,500.
Internal solid wall insulation – to insulate a whole 3-bedroom semi-detached house would cost approximately £650 if done by a professional or £450 if done as a DIY job. Prices vary by product and installer.
Payback
External solid wall insulation - typical annual savings are between £85 and £120 on the fuel bills. Payback period is 12+ years with an installation life of 25-30 years.
Internal solid wall insulation - typical annual savings are between £75 and £100 on the fuel bills. Payback period is 3 years for DIY installations and 6-7 years for professional installations.
What are the benefits of solid wall insulation?
Reduces your energy bills by up to 25%
Improves the thermal comfort in the home and serves as a noise barrier
Increases fire resistance of the walls as well as their moisture resistance
Reduces carbon dioxide emissions causing pollution and climate change
External solid wall insulation –The cost of insulated render/cladding is around £45 to £65 per square metre, depending on the selected product, installer, the condition of the exterior surface and its complexity. Since the whole house needs to be insulated using this method, minimum costs start around £2000. A typical semi-detached house with some 80 m2 of walls is likely to cost between £3,500 and £5,500.
Internal solid wall insulation – to insulate a whole 3-bedroom semi-detached house would cost approximately £650 if done by a professional or £450 if done as a DIY job. Prices vary by product and installer.
Payback
External solid wall insulation - typical annual savings are between £85 and £120 on the fuel bills. Payback period is 12+ years with an installation life of 25-30 years.
Internal solid wall insulation - typical annual savings are between £75 and £100 on the fuel bills. Payback period is 3 years for DIY installations and 6-7 years for professional installations.
What are the benefits of solid wall insulation?
Reduces your energy bills by up to 25%
Improves the thermal comfort in the home and serves as a noise barrier
Increases fire resistance of the walls as well as their moisture resistance
Reduces carbon dioxide emissions causing pollution and climate change
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