5 Damp Issues That Can Impact London Homes
We all know about the weather here in the UK, damp and cloudy seems to be the norm of late and that poses a real threat of damp attacking homes, especially in low-lying areas such as London and the Home Counties. In this short article, we take a look at some of the common damp issues that can arise in London homes.
- Rising damp – This is moisture that comes up from the ground; a building should have a DPC (Damp Proof Course) installed between lower brick courses. Moisture is drawn into building materials with capillary action and if there is no barrier, damp will continue to rise, damaging masonry, timber and plaster as it goes. The best way to determine whether rising damp is present in your London home is to book an independent damp survey through London Damp Specialists.
- Condensation – More likely to occur in the winter, when cold meets warm, this causes water droplets to form on the warmer surface, much like the outside of a glass when ice-cold beer is poured. With the central heating on and sub-zero temperatures outside, droplets of water often form on the inner windows. There are things you can do to reduce and even prevent condensation, which include generating an airflow through the home, heating the whole house and using a dehumidifier. Avoid drying damp clothes in the house, as this adds a lot of moisture to the air. We are the go-to condensation specialists for a definitive inspection.
- Penetrating damp – Moisture that enters a building from the roof or external walls is known as penetrating damp; often caused by a leaking roof, once rainwater gets into the internal roof structure, it starts to damage joists and rafters and will eventually cause damp patches on ceilings. The external walls can be damaged by driving rain; blocked guttering sends water seeping down the external walls and this can easily penetrate brickwork, masonry and timber.
- Wet and dry rot – Both these types of fungi thrive in humid conditions, yet wet rot requires different treatment than dry rot. If you notice a musky smell in the house and dry timber that cracks easily, the chances are you have timber rot and by booking an independent damp survey from London Damp Specialists, you can find out the cause and extent of the problem and receive a detailed report upon completion.
- Woodworm – There are two species of beetle that burrow into timber and lay eggs and the larvae consume wood pulp and the cycle continues until something is done about it. Special chemicals are sprayed and the solutions seep deep into the wood, killing eggs, larvae and adults. If you suspect your home is infected with woodworm, book our independent damp survey and our certified damp experts will source any issue and recommend a damp-proofing contractor to carry out the work.
If you are planning to buy a home in London, make sure you do a damp survey prior to making an offer. Call London Damp Specialists on 020 7205 4886 or enter your details in the form on this website.
In the event damp is present, you can negotiate with the seller and reach a satisfactory solution.
Damp Survey Costs
Transparent pricing with no hidden fees for our independent, unbiased surveys.
Level 1
What’s included:
- Inspection of walls
- Inspection of floors
- Inspection of ceilings
- Leak inspection of drains and plumbing
- Damp information and prevention guide
Level 2
What’s included:
- Everything in Level 1
- Dry rot inspection
- Wet rot inspection
- Woodworm inspection
- Damp information and prevention guide
Level 3 (Most Popular)
What’s included:
- Thermal Imaging
- Air humidity testing
- HD boroscope camera
- Brickwork pointing inspection
- DPC inspection
- Ventilation flow test on extractor fans
- 4K drone imagery roof, chimney stack
and guttering inspection - Structural condition inspection
- Inspection of walls
- Inspection of floors
- Inspection of ceilings
- Leak inspection of drains and plumbing
- Dry rot inspection
- Wet rot inspection
- Woodworm inspection
- Damp information and prevention guide
Survey Add Ons
Add On 1
Laboratory analysis Of plaster identifies hygroscopic salts such as chlorides and nitrates. which indicate whether damp is caused by rising groundwater or by plumbing leaks, This testing removes guesswork, allowing the exact source of moisture to be identified so the correct treatment is applied rather than carrying out unnecessary damp-proofing work.
Add On 2
qPCR DNA mould testing detects microscopic mould spores that are invisible during a normal inspection and van remain hidden behind walls, floors. or inside building rkaterials. It identifies the exact mould species present and the contamination level, allowing hidden mould problems to be confirrned and properly treated before they affect the property or occupants’ health.
Qualifications: All our surveyors are PCA and CSRT qualified for remedial treatments and also CSSW qualified for structural waterproofing.
Next day report: You will receive the report within 24 hours of the inspection taking place.
These are the tools we use
Damp Meter
A damp meter is a diagnostic tool used to detect and measure moisture levels within building materials such as plaster, brick, timber, and concrete.
Borescope camera
borescope camera is a small inspection camera attached to a flexible semi-rigid cable that allows you to see inside areas that are otherwise inaccessible.
Drone Inspection
A drone is a remotely operated aerial device equipped with a camera that allows visual inspection from above without the need for scaffolding or ladder.
Air Humidity Sensor
Air humidity sensor measures the amount of moisture present in the air, expressed as relative humidity (RH) in percentage. It helps determine whether indoor conditions are contributing to condensation, mould growth, or damp-related issues.
Thermal Imaging Camera
A thermal imaging camera detects temperature differences on surfaces by using infrared technology to produce a heat map image. In damp investigations, it helps identify cold spots, moisture intrusion, insulation defects, thermal bridging and leaks.
Air Flow Ventilation Detector
An air flow ventilation detector measures the movement and volume of air passing through vents, extractor fans, and air bricks. It confirms whether ventilation systems are working properly and achieving adequate air changes within a room. Poor airflow leads to trapped moisture, high humidity, condensation on cold surfaces, and ultimately mould growth.
Mould Lab Swab Testing
A mould swab test is carried out to confirm the presence of hidden mould growth and identify the specific species involved. Surface mould is not always visible, especially behind furniture, inside cavities, or within ventilation systems. Laboratory analysis of a swab sample determines whether active mould spores are present and what type they are, which helps assess potential health risks and decide the correct remediation approach rather than relying on visual assumption alone.
Lab Analysis of Plaster
Laboratory analysis of plaster is used to identify the type of salts present within the material, typically chlorides and nitrates. The presence and concentration of these salts help determine whether the moisture source is consistent with rising damp, ground contamination, or another forms [sic] of water ingress. such as mains water leak, This removes guesswork and prevents misdiagnosis, ensuring the correct remedial treatment is specified rather than applying unnecessary or ineffective solutions.
