Diagnosis of Damp Problems

It is important that the cause of a damp problem is correctly diagnosed.  TDT's qualified surveyor can visit your property to establish the nature and extent of the dampness.  TDT can offer a schedule of recommended works to overcome the problems that are being experienced, or that may become apparent later.

TDT can offer a holistic approach to the problem drawing from our extensive range of damp proofing products to suit the needs of our clients and their properties.

Lateral Penetrating Damp

If it is not possible to reduce external ground levels TDT will offer a Structural Waterproofing recommendation.  There are a variety of systems, further information is available on our Structural Waterproofing page.

In addition it is often possible to reduce the amount of water/moisture entering the property in underground situations by the use of membranes, diversion of rainwater discharge etc.


TDT offer a range of passive or powered ventilation systems.

TDT can often assist if the thermal performance of the structure is a contributory factor in the development of condensation.

Users of the building should also be aware that the sensible use of heating and ventilation can usually reduce, if not eliminate, problems of condensation.  The drying of washing on radiators, use of unventilated tumble driers etc should be avoided. 

A schedule of recommendations can be given by a TDT surveyor.

Penetrating Damp

As part of our diagnosis of the causes of dampness TDT will make recommendations for any external defects to be remedied.
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Rising Damp

The object of providing a damp course in the walls of a building is to prevent moisture being drawn by capillary action from the ground with which the structure is in contact.  Building materials are generally porous therefore they have the ability to soak up water in a similar action to that of a wick.

Moisture carried into the wall by a rising damp process will allow the wall to become wet and thus be susceptible to damage by frost.  The moisture will also pass into the joinery fittings such as skirtings, door frames and windows, causing conditions in which a variety of wood rotting fungi flourish.  In addition, all soils contain natural salts, these salts combine with the moisture and are drawn up through the wall structures.  During the natural drying our process the salt bearing moisture evaporates leaving behind deposits of these natural salts within and upon the surface of the wall.  The salt breaks down the internal plasterwork, mortar joints and external rendering, causing them to become hygroscopic and thus capable of absorbing moisture from the atmosphere and consequently compounding the damp problem.

View a Case History for Damp Proofing