Does damp-proof paint work?

Briefly. It hides the symptom for a season or two but traps moisture in the wall, often making the underlying problem worse. Breathable solutions outperform it long-term.

How do you treat damp walls internally without losing room size?

A 2–4 mm spray cork interior coat is the lowest-profile breathable option. It adds less than 5 mm thickness and can be painted or wallpapered directly.

Will spray cork stop black mould?

Yes, where the cause is condensation — which is the case in roughly 8 out of 10 UK homes with black mould.

The Best Treatment for Damp Walls in UK Homes (2026)

Most damp problems are misdiagnosed. Here's what actually works for condensation, penetrating damp and rising damp in UK homes — and where breathable spray cork fits in.

10 April 2026 · 7 min read

Around 80% of UK damp problems blamed on rising damp are actually condensation. Treating the wrong cause is why damp keeps coming back. The right fix depends on which of three categories applies.

The three types of damp

1. Condensation damp (most common)

Warm moist air hits a cold wall, water condenses, mould grows. Damp-proof paint actively makes this worse because it traps moisture without raising surface temperature.

2. Penetrating damp

Water entering through cracked render, failed pointing or leaking gutters. The fix is repairing the source — then a breathable external coating to stop reoccurrence.

3. Rising damp

Genuinely rare. Usually a failed damp-proof course or none at all in older properties. A chemical DPC injection by a PCA-certified specialist is the standard remedy.

Why spray cork solves condensation damp

Interior spray cork raises wall surface temperature above the dew point and lets vapour pass through. Mould has nothing to feed on, and the underlying wall stays dry. It's the only treatment that addresses the cause rather than masking the symptom.

When to call in a survey

If two of the following apply, get an independent damp survey before spending money on treatment: salt marks on plaster, peeling skirting paint, tide-mark stains rising from the floor, musty smell that lingers after ventilation.

FAQs

Does damp-proof paint work?: Briefly. It hides the symptom for a season or two but traps moisture in the wall, often making the underlying problem worse. Breathable solutions outperform it long-term.
How do you treat damp walls internally without losing room size?: A 2–4 mm spray cork interior coat is the lowest-profile breathable option. It adds less than 5 mm thickness and can be painted or wallpapered directly.
Will spray cork stop black mould?: Yes, where the cause is condensation — which is the case in roughly 8 out of 10 UK homes with black mould.

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