Insulation & Walls

Is cavity wall insulation safe

Published 2 Jun 2026

What this video covers

Is cavity wall insulation safe?

Yes — for most suitable homes it's safe and proven. The rare problems usually come from a poor installation, or fitting it in a home that was never right for it.

In this video

  1. 0:00 The short answer
  2. 0:16 Safe in the right property
  3. 0:32 Most problems come from bad installs
  4. 0:49 A 25-year guarantee backs the work
  5. 1:07 What this means for you