Understand the wall before you repair it
Cavity wall worries,
made clear.
Plain-English help for damp, failed wall ties, cracked brickwork and mortgage reports—followed by the right specialist, only if you need one.
Find your starting point
What is the wall
telling you?
You do not need to know the technical name. Choose the symptom or situation you recognise and we will help you ask better questions.
Damp, mould or cold patches
Work out whether insulation, rain, ventilation or another defect may be involved.
Follow the damp checks 02Cracks, bowing or movement
See which patterns can point to wall ties, lintels or local masonry movement.
Understand the signs 03A lender or survey has flagged it
Turn the exact report wording into a clear next step without losing time.
Prepare your evidence 04Insulation may need attention
Know when investigation, a guarantee claim, local repair or extraction makes sense.
Explore your options
The useful middle ground
Not every damp patch needs extraction.
A cavity-wall problem rarely announces its cause. The most useful inspection joins the clues together: exposure, rainwater, cracking, humidity, cavity condition and the history of any insulation.
Look outsideGutters, pointing, render, openings and wind-driven rain.
Map the symptomTiming, weather, temperature and the affected rooms.
Inspect selectivelyRepresentative ties and cavity locations, with limitations recorded.
Inside the wall
One wall.
Several possible causes.
A cavity is not an empty line on a drawing. Insulation can meet ties, debris, trays, openings and moisture. That is why a credible recommendation explains the whole system.
See what a survey checksA calmer way forward
From “something is wrong”
to a useful next step.
Tell us what happened
Choose the symptom and copy the exact survey wording if you have it.
Add what you know
How much of the house is affected, and any survey or lender wording in your own words.
We find up to 3 local specialists
We ask cavity wall specialists who cover your area to contact you with a quote. If insulation may be under guarantee, check that route too.
You decide
Speak to an independent specialist with no obligation to proceed.
Read before you repair
Advice that answers
the awkward questions.
Wall tie failure: signs, surveys and next steps
Understand possible wall tie failure signs, what a specialist survey checks and when repair may be needed. Evidence-led UK homeowner guidance.
Wall tiesWhat happens during a wall tie survey?
A plain-English guide to wall tie surveys, borescope inspection, reports, limitations and questions to ask a UK specialist.
Wall tiesWall tie replacement cost: what shapes a quote?
Understand the factors behind UK wall tie replacement quotes, what should be included and how to compare scopes safely.
Cracks & masonryHorizontal cracks in brickwork: what can they mean?
Horizontal mortar cracks can have several causes. Learn the warning signs, what to record and when to seek a structural inspection.
InsulationCavity wall insulation problems: a calm diagnostic guide
Damp, cold spots or a survey concern after cavity wall insulation? Understand the checks to make before considering extraction.
InsulationDamp after cavity wall insulation: what to check first
A practical UK checklist for damp appearing after cavity wall insulation, from urgent defects and paperwork to a proper inspection.
Show your working
Guidance with sources you can check.
Our content distinguishes official complaint routes from trade guidance and practical explanation. Every technical guide carries its sources and a review date.
See our editorial standardCommon questions
A quick answer may be all you need.
For a property-specific concern, use the guided check and share the facts you already have.
Do I need to remove my cavity wall insulation?
Not automatically. Damp and cold spots have several possible causes. A competent inspection should identify the moisture route, wall condition and insulation condition before removal is recommended.
Does a horizontal crack mean my wall ties have failed?
It can be a warning sign, particularly on older cavity walls, but it is not proof. Other movement and lintel problems can create similar cracks.
Can you help if a lender has asked for a report?
You can send an enquiry: choose “A survey or lender has flagged it” and paste their wording, and any deadline, into the notes. Harber Glaves Trading Ltd, which runs this site, will find up to 3 local cavity wall specialists who cover your area and ask them to contact you with a quote. The lender decides what report it will accept.
Who runs this site, and is it independent?
Cavity Wall Advice is part of the Better Home Hub network, run by Harber Glaves Trading Ltd. The guides link to their sources, but the site is funded by introductions: if you ask for quotes, Better Home Hub finds up to 3 local cavity wall specialists who cover your area and asks them to contact you. Companies pay Better Home Hub a fee when it introduces them, so this is free for you. Specialists are separate businesses, not part of Better Home Hub.
Still unsure?
Let’s work out what kind of help fits.
Describe the problem in plain English. We will ask for the details a specialist actually needs.
Start the guided check