Frequently Asked Questions

Rising damp is the process where moisture from the ground surrounding a property is absorbed upwards into the porous structure of the building walls.

Excess ground water and leakages from other sources can often expose bricks/masonry to enough moisture that it 'wicks' its way upwards through a process known as 'capillary action'. This process is very much like how a cloth touching a pool of liquid will draw up the fluid, even if the cloth is entirely vertical.

Most modern properties built within the last century or so will have a layer built in to the walls near the ground to stop this process in its tracks. This is known as a Damp-Proof Course (DPC).

This kind of damp is also known as 'rain penetration' and describes water leaking into the building from outside.

Common sources of water ingress are:

• Broken or missing gutters and downpipes
• Cracks in rendering or masonry
• Damage to brickwork and pointing
• Porous bricks or poor quality mortar
• Cracked/damaged roofs or missing roof tiles
• Faulty/blocked drainage systems
• Non-breathable outer wall coatings/paint
• Broken or missing windowsills

The problem is often more prevalent during periods of extended wet weather.

If your home is currently showing any signs of damp you will be well aware how unattractive it looks but it's not just an aesthetic issue.

Persistent damp often gives rise to mould, affecting respiratory systems and contributing to conditions such as asthma.

Some moulds can produce allergens, irritants and toxic substances, so Inhaling or touching mould spores may cause allergic reactions in some people.

At London Damp Proofing, we use a variety of specialist tools and techniques to locate and identify damp, including moisture meters, sample analysis and knowledge of different symptoms.

Our years of experience and training help us to offer the quickest and most cost effective solutions for every property and damp issue.

A damp-proof course (DPC) is a barrier integrated into a property's walls, with the purpose of preventing moisture rising upwards inside the porous brick structure and causing rising damp.

A damp proof course is usually laid horizontally, but can occasionally be vertical. The DPC layer is usually laid below any masonry walls that make contact with the ground around a property.

You can usually see a DPC as a dark line running along the bottom of a brick wall, sometimes a layer or two up.

Damp issues are not always limited to older properties. Rising damp is less of an issue in newer properties that must be built with a Damp Proof Course, but other forms of damp can be found in all types of building.

Properties with outer walls exposed to regular adverse weather may not be built to a specification that prevents penetrating damp.

Properties with cavity wall insulation can sometimes encounter issues where the insulation bridges the gap between inner and outer walls, allowing moisture to cross to the interior.

Issues with poorly fitted, faulty or damaged guttering can affect even the most modern homes, and this is a very common source of water entering a property.

This is a common question asked by clients.

Since every property is different in size, age, construction and usage, the cost for damp proofing can vary a great deal. This makes it difficult to offer a quote until our trained inspectors have surveyed your property and evaluated the problems.

Your best approach is to give us a call on 020 7593 8030 or fill out our contact form, then we can organise a survey as soon as possible.

Is it important to have damp proofing in a wine cellar?

Yes, it is vitally important for any business that wants to retain its customers. Why go to the expense of putting together a fine choice and then seeing it ruined through excessive moisture, water damage, and mould, which can also affect the condition of the building where it’s stored?

Is the wine affected when it is kept in damp conditions?

Absolutely. Excessive moisture can be a killer for the owner of an establishment as the humid conditions affect the cork, often allowing oxidation, which spoils the wine, and can see thousands of pounds worth of stock become worthless.

What potential issues can it cause to the building if the wine cellar is not damp-proofed?

As with any damp, structural integrity can be damaged, caused when plaster starts to crumble and timber supports start to show signs of mould and mildew, which also lessens the air quality and creates potential health hazards to employees. All of which takes time and money to put right.

Why are wine cellars more prone to damp

Cellars are below ground, with those in London often being next to clay, which has high water retention. That is why it pays to contact local experts, where here at London Damp Proofing, we understand the needs of our customers. Having a wine cellar damp-proofed is an essential job before any aesthetic additions front of house.

Why is damp proofing good for wine storage?

The damp proofing provides the management to stabilise the moisture levels in the cellar. Being able to do so ensures a clean environment, so that the condition of the labels will not deteriorate, which is an immediate turn-off to customers. Corks also remain in pristine condition.

What are the consequences of not having the damp proofing work carried out?

Those who fail to call us on 020 7593 8030 and arrange a visit within two working days might find their business falls on very hard times quickly when the quality of their wine deteriorates and the musty smell that comes with damp starts to damage the wooden racks, which can lead to bottles falling from them.

Does the work need to be carried out professionally?

Why employ guesswork to try and resolve a situation and get no nearer the solution when we are here, ready and waiting to assist, with a proven track record and the latest high-tech equipment? Always leave important jobs in the hands of professionals.

How will the cellar be damp-proofed?

There are several options depending on the size of the cellar and its location. Improved ventilation is one, as well as cellar tanking to offer protection or waterproof membranes being installed.

Is the temperature in the cellar affected by damp proofing?

It is, but not directly. What it does do is allow temperatures to be cooler as they remain stable, as moisture is kept at bay thanks to the professional methods that have been employed. This creates the perfect environment for wine storage.

What is meant by the term basement waterproofing?

It means that a team of experts, such as ours at London Damp Proofing, ensure that the basement does not let in any water so that it can be used safely in many ways, as we get to work using the latest high-tech equipment and embrace technology to deliver the best results.

Why is it important that I waterproof my basement?

You pay a lot of money for a property, so you must protect it properly. The integrity of the structure can be put at risk if damp starts to penetrate from its foundations, which can lead to mould and mildew forming, which creates further problems of their own.

What are the main types of waterproofing for basements available?

External waterproofing is one option, internal waterproofing is another, while alternative drainage systems, which can include sump pumps might be the best solution. When you contact our family-run company, a professional with extensive knowledge will be sent out to make an assessment.

Is damp proofing the same as waterproofing?

The answer to that is no. Damp proofing is how we resist moisture and stop it from becoming an issue inside the building, sometimes through installing a chemical damp proof course. Waterproofing is more for ground level, as it stops water from getting into basements.

Are there any telltale signs that show that waterproofing is required urgently?

Yes. If you see stains which are created by water that has seeped in and left stains or tide marks, it is an indication that the work is required. Visible signs of water on the floor are an obvious giveaway; while peeling paint, musty odours and the signs of mildew and mould are others.

Is it possible for me to waterproof my basement myself?

Any repairs by those without extensive knowledge may mask a problem for a short time, but they will return and most probably cause a lot of damage in the meantime. Why take the risk when you can call us and have the peace of mind of knowing that our jobs come with a 30-year guarantee?

I’ve heard of external waterproofing from a friend, but how does it work?

External waterproofing does what it says on the tin. It’s the method of digging around the basement before applying membranes. While it most certainly works, it is not always possible to carry out on many London properties owing to confined spaces.

Is a sump pump a good way to provide waterproofing?

We at London Damp Proofing tend to go for external solutions or a DPC, but others prefer the use of a sump pump. In essence, it initially removes the collected water that gathers in a sump basin. It can be particularly useful during periods of heavy rain when flooding becomes a possibility.

Will waterproofing add value to my home?

100% it will. Waterproofing is a great way to add value to a property before putting it on the market, when looking for the best price.