The Best Ways to Treat Damp and Mould in London Properties
London is situated on the Thames Valley Basin, which is clay-based and retains water, causing rising damp to attack many houses. Those who are planning to buy a London property would be wise to engage the services of an independent damp survey company, as this is the only way to be sure that the building is damp-free.
In this short article, we take a look at the most effective methods to manage damp and mould in London homes.
Damp Proof Course
Every building in London would have a DPC installed between lower brick courses, which forms a barrier to ground moisture to prevent damp rising up the exterior walls. Made from bitumen, the DPC can be damaged and should that occur, moisture can find a way up the walls and will eventually penetrate to the interior. Building an extension without regard for the DPC can lead to moisture rising up the walls and this is often a cause of damp issues in a London property.
Chemical Damp Proofing
Cavity walls can be injected with a waterproof foam that forms a barrier similar to the regular types of DPC, which is often the best solution. When we carry out an independent damp survey, we often recommend a chemical DPC, which also acts as thermal insulation and that can prevent condensation.
Waterproof Plaster and Render
There are top-quality products that provide a watertight seal when applied to walls; after removing damp plaster, the substrate needs to be properly cleaned before the watertight product is applied. After this has dried fully, another coat can be applied and finally, a skim of plaster, which should solve the damp issue.
Basement Tanking
There are providers of basement waterproofing in London and when they carry out a project, they guarantee the work for 30 years. There are two main basement waterproofing solutions, the first is the use of water-resistant plaster and render and the second is called a cavity drainage system, which is used when the basement is surrounded by wet ground. The treatment involves removing all furniture and items, then removing damp plaster and preparing the substrate for a studded membrane sheet that is firmly affixed to the walls and ceilings. Water runs down into underfloor channels and then it is pumped to drainage points. This effectively seals off the interior from the exterior, plus the system does not require much in the way of maintenance.
Independent Damp Survey
The best way to find out if a property has damp issues is to book an independent damp survey from London Damp Specialists; our certified damp surveyors use cutting-edge equipment to accurately determine the status of the building. We understand that our customers are looking for rapid results and we can usually carry out the survey within a few days of the booking.
If you are looking to acquire a London property, book an independent damp survey by calling us on 020 7205 4886 or complete the form on this website.
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.
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