How do I know if I’ve got cavity walls or solid walls?

How do I know if I’ve got cavity walls or solid walls?

Most cavity walls are indentified by two factors.

  1. They are about 10 1/2″ to 12′ (270mm – 300mm) thick overall (You can measure this at a door opening).
  2. All the bricks visible on the outside of the wall are all 9″ (225mm) long (except at corners and openings).

Solid walls have repeat patterns of 4″ (100mm) wide bricks as well as 9″ (225mm) long bricks over the main area of the wall. The walls are usually a little over 9″ (225mm) thick, although in larger properties the walls can be 13 1/2″ (330mm) thick.

Find out more about how to tell if you have cavity walls

Posted in: Cavity Wall Insulation