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Rising damp is a well-known form of damp that affects the ground floor of buildings. Despite the notoriety of rising damp it is not all that common and requires a very specific set of circumstances to cause it. It is often misdiagnosed as a result of this, so examination by a qualified surveyor is recommended before proceeding with any rising damp treatment.
This page will offer professional guidance on the causes of rising damp, the tell-tale signs of a rising damp problem and the treatments and solutions available.
Rising damp is caused by water from the ground traveling upwards through brickwork by capillary action. The water will contain a number of contaminants found in the ground, such as salts, that also travel up the bricks causing further damage to the wall.
The water and salts from rising damp can cause damage to plaster, timber and any absorbent decorative features such as skirting boards and wallpaper. This causes unsightly staining and can lead to rot in structural timbers.
The vast majority of properties in the UK should already be protected by a damp proof course. A damp-proof course is a layer of waterproof material in the ground floor wall that prevents the capillary action previously discussed. A damp proof course can take many forms, but whether it is made of slate or chemicals it can break down over time and this is usually when rising damp occurs.
Damage to a wall can disrupt a damp proof course but they can also be bridged by external factors such as raised flower beds, patios and other cosmetic additions to the outside of a home that can provide ground water with a way around an existing damp proof course
Damp proof courses can also be bridged internally by absorbent materials being added to the inside wall that stretch beyond the damp proof course and meet the bottom of your internal wall. A build-up of absorbent material inside a cavity wall can also bridge a damp proof course.
Any masonry structure unprotected by a properly installed and functioning damp proof course is susceptible to natural rising damp. Damp will rise by capillary action through the pores of the masonry seeking a means of evaporation.
The moisture will continue to rise until it reaches a height where, unless no evaporation is possible, gravity takes over and pulls it down again. This height is seldom more than 1.20m, although deposits of ‘salts’ may be found higher in the internal or external wall, often driven there by the use of non-breathing plasters, renders, ‘tanking’, paints or vinyl wall paper
Rising damp is unsightly, potentially unhealthy, often leads to timber decay and can cause heat loss due to the increased conductivity of the walls. If you notice the tell tale signs of rising damp a general rule of thumb is that the sooner you start thinking about resolving the issue, the less likely for more damage to occur and the lower the potential costs to remedy the issue. Often, the easiest and most reliable way to do this is to contact an experienced and qualified rising damp specialist such as ourselves that are familiar with rising damp problems and the variety of rising damp treatments available.
You can often identify rising damp without using any professional equipment, just looking at and touching your walls can often be enough. Typical signs that can identify rising damp include:
One of the most common tell tale signs are tide marks left on walls. Tide marks are caused by evaporation and salts from the ground. You will normally notice them anywhere up to a 1 metre above the skirting board.
If you do not notice tide marks, another very common tell tale sign is damp patches or staining. Typically, these damp patches are yellowish or brownish in colour and similar to tide marks, you will notice them up to 1 metre above the skirting board.
Look out for wallpaper coming off or peeling from the wall. You will most likely notice it coming loose from the skirting board first with the corner of the wallpaper turned or curved up
As with many forms of dampness, rising damp has the potential to cause rot within timbers it comes into contact with. Look out for skirtings that are cracked, easily crumble or localised fungus growing on or creeping out of the side. Also, look out for damaged or flaky paint.
Salts in the form of white fluffy desposits in the plaster similar to the images below are another clear tell tale sign. These salts are washed out of your bricks and into your plaster leaving what can look like blistering patches on your walls.
If you see black mould appearing above your skirting board it is a clear sign that there is some form of dampness affecting the area, especially if you have no other evidence of black mould within the property and the black mould is localised from the skirting board to up to 1 metre above the skirting.
If the above tell tell signs do not seem to relate to the damp issue you are having but you still suspect rising damp, check the following:
It is also important to note that rising damp only occurs on ground floor levels as it is moisture from the soil that is being drawn up the walls and thus causing the rising damp problem.
If it is the case that your damp problem is on the first floor or above, it may be that you have a condensation problem or a penetrating damp issue. View our damp proofing web page to help you identify and solve your damp problem or contact your local Wise Property Care branch for help in identifying your property problem.
It is not uncommon to hear rising damp being misdiagnosed. Many individuals inexperienced with identifying rising damp issues may just assume that due to the usual tell tale sign of a tide mark on the wall that you have a rising damp issue. Before considering instructing any form of rising damp treatment, consider the following:
Firstly, consider if the rising damp (damp proofing) barrier is really to blame. Sometimes new external features such as a flowerbed or patio may have been installed above the rising damp barrier causing rising damp to occur. By lowering these features to below the damp barrier you may cure a rising damp problem by allowing the area to dry out naturally. After that, all you really need to do is to regually open your windows and heat the room.
However, if the rising damp barrier has failed, modern techniques employed by rising damp specialists are very successful and a rising damp survey will reveal the extent of any problem with the recommended and most appropriate rising damp treatment. This could either be the injection of water repellent chemicals into the brick work or the fitting of a new physical damp proof membrane to the area with the removal and replacement of any affected plaster work and damaged timber.
At Wise Property Care, we are experts at identifying and treating rising damp. If you suspect a rising damp problem within your property, call 0800 65 22 678 or click to find your local branch and speak to local rising damp specialist. With our 20 year property repair guarantee, you will have the peace of mind that your rising damp problems will soon be over.
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