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Founded by Friends of the Earth in 1982


Cavity Wall

Cavity Wall Insulation

An incredible 35% of our domestic heat is lost through our un-insulated cavity walls. The Energy Savings Trust has calculated that an average household could save £115.00 on its heating bills per year by installing cavity wall insulation, and recover the cost of installation in little over 12 months. They will also save 610Kg of CO2 per annum and reduce their carbon footprint.

SEAL uses the InstaFibre blown mineral wool system. Once installed in the cavity wall, this forms an insulative heat retaining barrier, which radiates your heat back into the home. This means that you will need your heating on less and more easily maintain a constant comfortable temperature throughout the home. Condensation will be minimized and gaps around badly fitting door and window frames eliminated. Your home will be warmer and cheaper to run.

The Instafibre system

The Instafibre system is used extensively all over the country and has been approved and certified by the British Board of Agrément (BBA). Similarly, the materials we use are the best that money can buy (contact us if you require more technical data). All of our cavity wall installations are backed up by a 25 year independent guarantee issued by the Cavity Insulation Guarantee Agency - CIGA Generous grants from government and fuel utilities are available to everyone to encourage them to insulate their homes - see section on Prices and Grants.