The basic problem
A damp-proof course is intended to interrupt moisture rising through masonry. If soil, paving, render or debris forms a path across it, moisture may bypass the barrier. This is commonly described as bridging.
What you might see
Inside, there may be staining near skirtings, deteriorating finishes or salt deposits. Outside, a path or flower bed may sit close to or above a visible damp-proof course. Not all houses have a readily identifiable course.
Inspect drainage too
Ground levels are only part of the picture. Look at where rainwater falls, whether a gully becomes blocked, and whether the path slopes towards the wall. A raised area that collects water can create additional problems.
Do not dig blindly
Lowering external ground can affect thresholds, drains, steps, foundations and accessibility. A trench without proper drainage may simply collect water next to the wall. Obtain informed advice before altering levels significantly.
Other forms of bridging
Cement render extending below the course, debris in a cavity and internal screeds or plaster bridging details may contribute in some buildings. They need to be assessed in the context of the original construction.
What to do
Have the geometry and moisture source checked, then choose a correction that safely manages water away from the building. Avoid assuming an injected course will compensate for a continuing bridge.
Keep dated photographs and notes of any changes. They can be useful when explaining the issue to a surveyor or contractor. If there is active water near electrics, an unstable ceiling, or a floor that appears unsafe, arrange prompt professional help rather than waiting to see whether the problem improves.
Need help from a local damp specialist?
Look for a suitable local professional and explain the symptoms clearly. You can use an external trade-matching service to request quotes; check credentials and the proposed diagnosis before agreeing to work.
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