Damp in the home or business premises can make living and working conditions uncomfortable, as well as potentially unsafe if the root cause is left untreated. There are many reasons why you might be experiencing damp in your property. For example, rising damp in your London home can occur from a missing or damaged DPC (Damp Proof Course). However, if you have noticed that your walls are wet on the inside after a bout of heavy rain, you may well be suffering from an issue known as penetrating damp.
Penetrating damp is the name given to the movement of water from exterior facades or roof defects to interior surfaces. It can occur after particularly heavy rainfall in properties with solid brick construction, properties without an insulating cavity, or if the cavity has been incorrectly filled. If a cavity has been filled with inappropriate material, it can soak up and hold a lot of moisture which slowly permeates into interior walls, causing wet patches on the wall after rain.
This type of damp can also be caused by leaky gutters that are broken, wrongly installed or incorrectly sized for the property, which causes water to be directed to the wall instead of away from your home. Similar problems can occur from cracked or broken rendering and brickwork, or if windows have been installed badly or if the sill has been damaged, directing water onto the wall below instead of funnelling it away from the house, resulting in a wet wall.
Basement walls that are earth retaining commonly suffer from penetrating damp as they are subjected to changes in water table levels that occasionally occur.
Penetrating damp is likely to occur on exterior walls where the ground level is above the interior walls, creating a “bridging” effect for moisture to avoid the DPC and easily travel from exterior to interior surfaces. Faulty brickwork could be the underlying reason for any walls above ground level to be wet with damp as a result of defects in the construction or damage caused by natural causes such as extreme weather (such as from frost and/or storms).
It is worth noting that even the tiniest crack or crevice in a porous wall can invite large quantities of moisture/water and cause extensive damage. This can make it exceptionally hard to identify the cause of penetrating damp to the untrained eye which is why it is always recommended you hire a professional to take a look around if you suspect you have a damp issue of any kind.
If you suspect that your property may be suffering from penetrating damp, you are likely to see the following signs around your property:
These symptoms may also be reminiscent of other types of damp, and that can make it hard to distinguish between them. Regardless of what type of damp you have, be it penetrating damp or rising damp, the risks to your home and your health are much the same.
Without solving the source of penetrating damp, whether caused by defective cavity insulation, leaking gutters or broken brickwork, the problem will continue to persist and can lead to some severe problems around your property, including:
All of these issues can be costly to fix and can cause real damage to the foundation and structural integrity of your home, not to mention your health. Mould growth can greatly irritate asthma sufferers and those with lung conditions, as well as those with skin conditions such as eczema.
If left long enough, damp could make your house unsafe to live in which is why it’s essential at the first sign of damp or wet walls you employ professionals to identify and treat the problem at its cause.
Whilst penetrating damp is almost always the result of a defect outside of your control, it’s still important to minimise the risk of any other form of damp impeding on your home. There are several easy ways you can reduce the risk of excess moisture causing issues for you inside your home, including:
Cleaning and maintaining gutters and drains to prevent spilling and subsequent water ingress.
Unless there is an obvious source of moisture, property owners can often misdiagnose the type of damp that is affecting their structure, which can lead to costly and inefficient DIY repairs. If you are concerned about penetrating or rising damp in your London-based property, please don't hesitate to give our expert and friendly team a call on 0208 535 7536 for a free survey.