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Penetrating Damp Isle of Man

Penetrating Damp

Penetrating Damp is sometimes known as “rain penetration” and can occur through walls, roofs, window or door surrounds. Defects in roof tiles, cracked pointing, blocked weep holes or defective seals can allow water to penetrate and enter a property.

How to Identify Penetrating Damp?

There are a number of signs to help determine if your property has penetrating damp, which include:


Damaged internal decoration – damp, discoloured tidemarks in line with external ground level on internal surfaces.


Damaged Plaster - blistering, salting and disintegration.


Rotting skirting boards, floor timbers – wet rot decay.


Localised dampness – Random damp patches at high and low level that do not dry out

Mould Growth – musty smell, spoilt decoration.


What Causes Penetrating Damp?

There are two main causes of penetrating damp:

Lateral Penetrating Damp – caused when the external ground, abutting the wall is above the internal floor level. This is low level penetrating damp, which is usually below two metres in height.

Building Defects – defective roof coverings, cracked brickwork, badly fitting windows/ door frames, faulty guttering and downpipes. Penetrating damp from building defects will require repairs by a builder.

Treatments for Low Level Penetrating Damp

Low Level Penetrating Damp can adversely impact on the environment in your property, but there are various treatments available to correct this potentially harmful occurrence.

We offer Single Membrane and Cementitious Tanking system solutions to treat problems caused by high external ground levels.  These solutions will provide a dry internal wall surface, making the cellar or basement rooms of your property habitable again. Our current treatments are designed specifically for rooms below ground level.

Want to know more about penetrating damp?

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