Articles | Cavity Reset

Longer pieces on the things people ask about most: the exposure that makes filled cavities fail, how to use a guarantee before paying for extraction, and what to rule out before blaming the insulation. Written from what the borescope shows, with the sources named.

20 May 2026

Six things to rule out before you blame the insulation

Damp on a filled cavity wall is often not the fill at all. Gutters, sills, pointing, ground levels and condensation come first, and they are cheaper.

Read the article

12 March 2026

Using your CIGA guarantee before you pay for extraction

If a registered installer filled your walls in the last 25 years, a guarantee may put defective insulation right for free. Here is how the claim works.

Read the article

14 January 2026

Why cavity wall insulation fails on exposed walls

The exposure zones in the building guidance explain why filled cavities on exposed walls get wet, and why one gable fails while next door stays dry.

Read the article

Free survey

Book your free survey

Name

Postcode

Phone, to arrange your survey

Property type (optional)

What you are seeing, on which wall, and roughly when it started (optional)

We reply within one working day to arrange a free survey and quote.

9.74/10 from 141 reviews
4.9/5 from 25 reviews

Scores for Remove Sprayfoam Limited, the company behind Cavity Reset.

Or email [email protected]. Your details are used to answer you and for nothing else: see the privacy policy.

What happens next

A free survey first We check the wall inside and out and look into the cavity with a small camera. Then you get a fixed price in writing.
The insulation comes out Bricks come out at the base of the wall, the old fill is drawn out, and the bricks go back in, pointed to match.
A completion certificate You receive a completion certificate when the work is done. If a lender or surveyor has flagged a filled cavity, that certificate is what you show them.