Cavity Wall Insulation
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Answers

Damp

Does cavity wall insulation cause damp?

Not on its own. Properly installed in a suitable, well maintained wall, cavity fill should keep the inner wall dry. It causes damp when the wall was unsuitable (very exposed to driving rain, or a narrow cavity), when the installation was poor (gaps, slumping, debris left in the cavity), or when the outer brickwork lets in more water than the fill can cope with.

2 November 2026, 3 minute read

Tell us what the walls are doing

Three short steps. Your postcode, the house and what you are seeing are enough to start. The specialist confirms the detail with a borescope survey before any price is fixed.

Costs you nothing. We hold on to what you send until you have agreed to the extraction specialist we suggest.

Step 1 of 3

Where is the house?
Ask for a cavity survey