Penetrating Damp

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What is penetrating damp?

Penetrating damp is an all too common issue often due to a lack of property maintenance with the potential to seriously damage both the exterior and interior materials of a property.

What causes penetrating damp?

Penetrating damp generally occurs when water finds its way from the outside in and as such can occur at all levels of the building. This is unlike rising damp which occurs only at ground level. Penetrating damp can occur for several reasons as follows:

  • Ongoing and undetected leaks from pipes
  • Faulty rainwater goods ie blocked gutters, faulty down-pipes
  • Roof defects such as missing roof tiles
  • Damaged pointing, cladding, flashing or render
  • Long periods of rain and heavy winds
  • Walls exposed to wind driven rain
  • Flood water saturating masonry

What are the signs of penetrating damp?

As water continues to penetrate the property, the moisture will begin to soak through the bricks and mortar and into internal plaster and timbers.  This can lead to discolouration and damage of plaster as well as increasing the risk of rot and woodworm attack to timbers which thrive in damp conditions.

  • Growing circles of random damp patches on walls or ceilings
  • Wet and crumbly plaster
  • Drips and puddles
  • Green mildew, moss on outside walls
  • Signs of spores or mildew
  • Unpleasant damp smell
  • Blackened and rotten timbers.

How do ProTen treat penetrating damp?

The essential first step is to check for and fix any property defect issues and stop moisture from entering a property. This includes clearing blocked gutters, keeping roofs in a good state of repair and not leaking and assessing for loose pointing and cracks in the brickwork and render and checking for leaks.

When the problem is ongoing, damage extensive or has not been resolved by repairing property defects, then more involved works may be required.

ProTen Services may recommend a survey is undertaken at this stage to asses and recommend any necessary action. This may involve a property inspection to assess the cause of the damp to a thermal imaging survey which will help pinpoint or rule out a leak.

Visit our SURVEY page for more information.

Our Property Maintenance team are able to carry out necessary repair works and provide property maintenance that will keep a property in the best condition.

Visit the Property Maintenance section on our website for more information on how ProTen can help.

To find out more about penetrating damp contact our team here


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