Diagnose the real cause of damp — and treat it properly
Rising damp, penetrating damp, condensation and timber decay all need different solutions. Our qualified damp specialists identify the actual problem and specify the right fix.
Proper diagnosis, targeted treatment, lasting results
A lot of damp work goes wrong because the wrong problem was treated. We start every job with a proper assessment — measuring moisture, inspecting external causes, and only then recommending a treatment plan.
That might mean a new chemical damp-proof course, replastering with salt-resistant systems, external repairs to stop penetrating damp, ventilation upgrades for condensation, or specialist timber treatment where rot or infestation is present.
You'll get a clear written assessment report explaining what was found, what caused it, and exactly what needs to be done — with no jargon and no upselling of treatments you don't need.
Why customers choose CornerStone
- Rising damp diagnosis and treatment
- Chemical damp-proof course (DPC) installation
- Penetrating damp repairs and coatings
- Condensation and ventilation solutions
- Timber treatment for rot and infestation
- Written assessment report with every quote
A complete damp proofing service under one roof
Everything you need for this area of your property, delivered by qualified specialists — with one point of contact from assessment through to sign-off.
Rising Damp Treatment
Chemical damp-proof course injection with salt-resistant replastering to permanently stop rising damp.
Penetrating Damp Repairs
External source diagnosis and repair — pointing, render, roof or gutter — followed by internal remedial works.
Condensation Control
PIV units, extract fans and ventilation upgrades that solve black-mould condensation permanently, not just cosmetically.
Timber Treatment
Dry rot, wet rot and woodworm identification and treatment, including structural timber replacement where required.
Damp Assessments
Independent moisture assessments with written report — ideal pre-purchase, pre-sale or before a refurbishment.
Salt-Resistant Replastering
Proper waterproof render and skim systems so treated walls stay dry and can be redecorated within weeks.
The problem is rarely what people think it is
Most damp we're called to isn't rising damp at all — it's condensation, penetrating damp from a failed gutter or bridged DPC. Treating the wrong cause is expensive, disruptive, and doesn't fix the problem.
Our assessors are trained to look outside as well as in — checking gutters, pointing, ground levels, ventilation and existing damp-proofing — before recommending any treatment.
- Moisture-meter readings recorded
- External cause investigation
- Independent written report
- Long-term guarantee on treatments
Straightforward from first call to final walk-round
No pressure sales, no surprise costs. Here's exactly what to expect when you work with us.
- 01
Damp Assessment
A qualified assessor inspects the property, takes readings and identifies the actual cause of the damp.
- 02
Written Report
You receive a plain-English report explaining findings, causes and recommended treatments — with an itemised quote.
- 03
Remedial Works
DPC installation, replastering, ventilation upgrades or timber treatment — carried out with minimal disruption.
- 04
Guarantee Issued
Workmanship guarantee, plus insurance-backed guarantees available on chemical DPC installations.
Untreated damp doesn't stay contained — it spreads
Damages the building fabric
Long-term damp rots skirting, joist ends and structural timbers — turning a repair job into a rebuild.
Affects your family's health
Black mould from persistent damp is a known respiratory trigger, particularly for children and older people.
Kills property value
Damp is one of the top three reasons homebuyers pull out or negotiate hard on price after a survey.
Frequently asked questions
How do I know if I have rising damp or something else?+
You often can't from the symptoms alone — condensation, penetrating damp and rising damp can all look similar. Our assessment uses moisture readings and inspection to identify the actual cause.
Is damp proofing disruptive?+
Most treatments are completed room-by-room over a few days. We'll walk you through what to expect before we start.
Do you offer a guarantee?+
Yes — damp-proofing treatments carry a workmanship guarantee and, where applicable, manufacturer product warranties.
How long before I can redecorate?+
New salt-resistant plaster typically needs to dry for around a month per 25mm of thickness before decorating. We'll advise on your specific job.
Will treatment stop black mould coming back?+
If the underlying cause is properly diagnosed and treated — yes. Cosmetic anti-mould paint alone rarely lasts because the moisture source is still there.
Do you provide reports for house sales?+
Yes, we produce independent pre-sale and pre-purchase damp assessment reports suitable for solicitors and mortgage lenders.
Ready to protect your property?
Get a free, no-obligation quote and we'll come and take a proper look — no pressure, no pushy sales.