PCA CERTIFIED
Basement Tanking in London
At Dampstar, we provide basement and cellar tanking to protect your property from water damage and damp. Our expert damp surveyors identify the source of moisture before installing the right waterproofing system, creating a durable barrier that keeps your basement dry and protected.
What is Basement Tanking?
Basement tanking is a waterproofing method used to protect below-ground walls and floors from water ingress and damp. It involves applying a waterproof membrane, or rendering directly to the internal surfaces, creating a barrier that prevents moisture from passing through the structure.
Â
Tanking is commonly used in basements and cellars where walls are in direct contact with the surrounding ground, making them more vulnerable to groundwater and penetrating damp. Before installing a tanking system, the condition of the walls and the source of moisture should be properly assessed. Once installed, basement tanking can help prevent damp patches, mould growth and water damage, creating a dry, protected environment that is better suited for storage, living space or other everyday uses.
Signs You Need Basement Tanking Services
Signs that you may require basement tanking include:
Â
- damp or discoloured walls
- peeling paint
- mould growth
- musty smells and white salt deposits on masonry
- You may notice water seeping through walls or floors, particularly after heavy rain
Â
If you spot any of these signs, contact us for a professional inspection, as basement and cellar damp problems can quickly worsen without treatment.
Our Basement and Cellar Tanking Process
Survey and Diagnosis
We start with a thorough survey of your basement or cellar, checking for damp, water entry points and the condition of the structure. By identifying the source of the problem, including penetrating damp or groundwater pressure, we can recommend the most suitable tanking solution for your property.
Preparing the Area
Once the survey is complete, we prepare the walls and floors for waterproofing. Loose materials, old coatings and debris are removed, surfaces are thoroughly cleaned, and any required repairs are completed. This ensures the tanking system can be applied correctly and perform effectively over time.
Installing the Waterproofing
Once the area is prepared, we install the most suitable tanking system across the walls and floors which creates a protective layer that helps prevent water from entering the basement or cellar. We select the waterproofing method based on the building, moisture levels and site conditions.
Why Choose Dampstar?
As a trusted, expert local team, we combine traditional craftsmanship with modern methods, delivering reliable, on-time damp proofing results property owners can depend on.
Expertise
Our team has many years of hands-on experience dealing with all types of damp in London’s unique building landscape.
Honest assessments
We provide clear, transparent reports and never recommend work you don’t need.
Guaranteed work
Many of our services come with long-term guarantees for your peace of mind.
Full compliance
All our damp-proofing treatments are fully compliant with UK building regulations and industry standards.
Our excellent reputation
Our many 5 star Google reviews speak for themselves.
Trusted, PCA Certified Damp Proofing Services
Accreditations & Certifications
Our accreditations reflect our commitment to the highest standards in damp proofing, waterproofing and timber preservation. As PCA-certified damp and timber surveyors, we follow industry best practices, use proven methods and deliver work you can trust. Explore our professional accreditations and see why homeowners, landlords and commercial clients choose Dampstar.
What Our Clients Say
Basement Tanking in London Since 1960
Dampstar are based in Chiswick, West London, but provide basement and cellar tanking across the whole of London and Hertfordshire.
Our Services
Roof Waterproofing
Protects your home’s first line of defence, treating pitched, tiled, and flat roofs against leaks and water damage.
Leak Repairs
Quick assessment and effective repairs for roof leaks, rising damp, or other water ingress issues.
Basement and Cellar Tanking FAQs
How much does basement tanking cost?
Basement tanking costs can vary depending on the size and condition of the basement, level of water ingress and waterproofing system required. A professional survey will help determine the right solution and provide an accurate quote for your property.
How long does basement tanking last?
A professionally installed basement tanking system can typically last 10-20 years or longer, depending on the system used, the condition of the structure. Correct preparation and installation are essential, as gaps or damage to the waterproof barrier can reduce its lifespan.
Can you tank an old basement or cellar?
Yes. Tanking can be installed in many older basements and cellars, but the existing structure must be assessed first. Damaged mortar, weak masonry, existing coatings and other defects may need to be repaired or removed before the waterproofing system is applied.
What is the difference between basement tanking and a cavity drain membrane?
Tanking creates a waterproof barrier across the walls and floors to resist water entering the basement. A cavity drain membrane takes a different approach, allowing water to enter behind the membrane before directing it safely towards drainage or a sump and pump. The right solution depends on the property and level of water risk.
Can basement tanking stop an existing damp problem?
Basement tanking can protect against moisture and groundwater entering through below-ground walls and floors. However, damp can have several causes, so the source should be identified before treatment begins. A survey helps determine whether tanking or another damp-proofing or waterproofing solution is appropriate.
Can I decorate my basement after it has been tanked?
Yes. Once the tanking system has cured and the appropriate finishing work has been completed, the basement can be prepared for plastering and decoration. Care must be taken not to damage or penetrate the waterproof barrier when installing subsequent finishes or fittings.
Is basement tanking suitable if I want to convert my cellar into a living space?
Tanking can form part of a waterproofing system for a cellar or basement conversion. For habitable rooms, the design should consider groundwater, drainage, ventilation and how the space will be used. Depending on the level of risk, more than one waterproofing system may be needed.
Do I need a survey before having my basement tanked?
Yes. A survey identifies how water is entering, checks the condition of walls and floors, and highlights any repairs needed. This ensures the right waterproofing solution is chosen for your basement.
Which areas do Dampstar cover?
Dampstar provides basement and cellar tanking across London and Hertfordshire, helping homeowners, landlords and property managers prevent damp and water ingress.
Book A Survey
DAMPSTAR
Hours
- Mon 08:00 – 17:00
- Tue 08:00 – 17:00
- Wed 08:00 – 17:00
- Thu 08:00 – 17:00
- Fri 08:00 – 17:00
- Sat 09:00 – 17:00
- Sun Closed
