If a wall is less than 10 inches thick, it’s probably solid. Do this by measuring them in an external doorway or window. If your home was built before 1920, it probably has solid external walls rather than cavity walls, which only came into widespread use in the 1920s.įor brick-built homes, you can also tell by checking the thickness of your external walls. How can I tell if my home has solid walls? It only takes a few minutes and there are all kinds of benefits. Looking to save money on your energy bills? Switch to OVO and save up to £350 on your gas and electricity bills. Here’s our handy guide to the ins and outs of solid wall insulation: With that in mind, when we use the word ‘external’, we just mean the outside of the external walls of your house – while the word ‘internal’ means the inside of the same external walls. You can do this internally or externally – for instance, by insulating the inside or the outside of your external walls. the ones that let in air from the outside world. But it’s worth remembering that while the initial costs are greater, the savings on your heating bills will be bigger, too!Ī word about words: just to be clear, we only recommend insulating the external walls of your house – ie.
While cavity walls can be insulated quickly and cheaply, solid wall insulation is a more expensive undertaking.
Here's how much you could save on your energy bill (£/year) with solid wall insulation 1 In case you didn’t realise, solid walls let twice as much heat escape as cavity walls – so insulating them makes a good deal of sense. It’s possible to insulate either the inside or the outside of your walls, and each option has its pros and cons.
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