Basement Waterproofing
Protect Your Property from Damp, Flooding & Structural Damage
Basement flooding is a problem no homeowner or business wants to face — but when it does happen, fast and effective action is critical. In London, the risk of basement water ingress is on the rise due to increasingly heavy rainfall and urban development.
At City Waterproofing LTD, we specialise in proven basement waterproofing solutions tailored to the unique challenges of London properties.
Why Do Basements Flood?
Basements and cellars are naturally vulnerable to damp due to their construction below ground level. Moisture from surrounding soil can penetrate through floors and walls, particularly when hydrostatic pressure builds up. This often occurs as a result of:
- Prolonged or heavy rainfall
- Rising groundwater levels
- Proximity to rivers or watercourses
- Nearby construction activities
- Burst water mains
Even a small leak can quickly escalate into serious flooding — risking property damage, health issues, and costly repairs. Whether you're dealing with recurring damp or one-off flooding, the right waterproofing system can restore peace of mind.
Effective Basement Waterproofing Solutions
There are different methods for waterproofing a basement, depending on how the space will be used — from dry storage to full conversions into living areas.
All work carried out by City Waterproofing LTD complies with BS 8102:2022, the British Standard Code of Practice for the protection of below-ground structures from water ingress.
We carefully design each system based on:
- Your intended use for the basement
- Ongoing access for maintenance
- The most appropriate solution for the building's structure
Our Waterproofing Systems
Type A: Barrier (Tanking) Systems
A Type A system involves applying a waterproof barrier (such as a tanking slurry or render) to the internal walls and floors of a basement. This creates a physical barrier between your home and groundwater.
Advantages:
- Simple concept
- Provides a complete seal when applied correctly
Considerations:
- Requires extensive surface preparation
- Prone to failure if the substrate bond is compromised
- May crack with movement or stress
- Installing fixtures afterward may breach the seal
If you're unsure whether tanking is suitable for your property, we can assess and advise during a site survey.
Type C: Cavity Drainage Membrane Systems
The Industry Standard for London Homes
Type C systems are the most reliable and widely used waterproofing solution. A studded cavity membrane is applied to walls and floors, allowing water to travel behind it and into perimeter drainage channels.
Water is then directed to a sump and pump or to an existing drainage system, keeping your basement dry and stress-free.
Advantages:
- Minimal surface preparation
- No need for structural alterations
- Ideal for basement conversions
- Allows for dry lining and easy installation of fixtures
- Reduces pressure against the building structure
This method is especially popular for basements being converted into living areas, home offices, or entertainment spaces.
Why Choose City Waterproofing LTD?
- Fully compliant with BS 8102:2022
- Expert survey and diagnosis
- Tailored waterproofing solutions
- Minimal disruption to your home
- Long-term protection with high-quality materials
- Competitive pricing and clear communication
Get a Free Basement Waterproofing Survey in London
Whether you're dealing with existing damp issues or planning a basement renovation, City Waterproofing LTD is here to help. Our experienced team will inspect your property, identify the best waterproofing solution, and provide a detailed quote — with no obligation.
Contact us today to schedule your survey and take the first step toward a drier, safer basement.