What is rising damp?

Rising damp is caused by moisture containing natural formed salts rising from the ground through a capillary like action. Salts and minerals in the ground are normally harmless. However, when combined with water these salts dissolve and become acidic substances.

Rising Damp is usually evident in the form of stained walls, blistering and peeling paintwork and salt accumulation of up to 1 metre high. Rising damp, if left untreated, can cause serious damage to a building's structural integrity, not to mention damage to timber work i.e. flooring, architraves and skirting boards. As a health issue, Rising Damp can be detrimental to people suffering from asthma or any other breathing disorders.

Detecting rising damp

A qualified DampShield Technician will carry out a thorough inspection using a digital moisture detector. Our Technician will determine by the metre reading if the dampness is caused from rising or penetrating/lateral damp. A detailed quote will then be forwarded to the owner outlining the recommended work/s to be carried out including the specifications and costs involved to rectify the damp problem.

How to fix a damp problem

The permanent solution to remedy your Rising Damp is to install a Traditional Polypropylene Damp Proof course. The Polypropylene is a 2mm thick sheet which is hard and solid, yet flexible. It is resistant to acidic salts and minerals and cannot be torn or ripped during its installation.

Our Damp Proof Course creates a continuous barrier against Rising Damp. Other damp proof courses made from lead, slate, zinc, tar and bitumen, can be attacked by rising damp.


Installing a traditional damp proof course

damaged wall infested with rising dampDamp EffectsA wall with rising damp also showing wet rot on the timber work.
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inserting the damp proof courseLateral DampWhen moisture penetrates the structures wall horizontally it causes
finished wall following damp proof courseReady for skirtingsThe brickwork is then re-mortared brick are returned


The DampShield Guarantee

DampShield is confident when installing a traditional (also called a physical) damp proof course. Our confidence extends to our customers offering them a 50 year guarantee.50 year guarantee


More on rising damp

Blending the old with the new.

Following a damp proof course installation, there is still the job of re-rendering/ re-plastering to blend the old wall with the new.

During the drying out period, salty deposits surface on the brickwork.

The walls are stripped to a safe level usually 300mm above the damaged render/plaster.
rendered and ready for painting
A salt neutraliser is used in the render and plaster mix.


A cross section diagram showing the position of the damp proof course.

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