Internal Wall Insulation - Getting Started - Solid Walls – How do I know if I have solid walls?

The majority of solid walled buildings in this country are built of brick or stone and tend to pre-date the 1930s. For brick-built buildings, if the wall is more than 25.4cm thick then it probably has a cavity; solid brick walls are usually around 22cm thick; stone walls vary considerably from 10cm to 100cm!

Your house may have extensions from different periods and may therefore be constructed with different methods, this will need to be understood prior to making a choice about how to upgrade the insulation value of your home/building.