Outside Wall Insulation v Internal Insulation

For homes that are solid walls up to 45% of heat will be escaping through these uninsulated walls and so it makes financial as well as environmental sense to insulate these walls . The choice then comes down to either internal insulation or external insulation and both have their advantages and disadvantages .

As internal traditionally means stripping the walls and having to remove and then re-position things like electrical sockets, heating pipes, skirting, coving and any fitted furniture this is only a viable option when a house is being completely renovated. The only other time when it should be installed instead of external is when the exterior is of great aesthetic value or has conservation or listed status.

Externally fitting insulation means no reduction in room sizes, no internal refitting of fixtures and fittings and redecoration and of course less disruption to  family life.  However, the greatest benefit is that exterior insulation is far more efficient than internal insulation per mm of insulation.


This is because the thermal mass of the solid wall – usually up to 9 inches thick – is a form of insulation itself and is not used when you put the insulation between the wall and the internal heating . Also the outer leaf of the wall will still get wet and cold with internal insulation whereas with an externally fitted system the wall is kept completely dry and more thermally efficient and the full depth of the wall is also being completely used as an additional thermal barrier as well as the insulation.

As a respected and long standing business our advisors will give genuine advice as to whether internal, external or a mixture of both are suitable for your particular property.

If you would like further information either verbally or from our brochure then please contact us via enquiries@externalinsulation.co.uk or simply call our freephone number 0800 975 5231


Posted in: Internal Wall Insulation

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