Cellar Waterproofing
Turn Damp, Unused Cellars into Dry, Usable Spaces
Many London properties have cellars that are underutilised due to persistent dampness or water ingress. With the right waterproofing system, a damp, unusable cellar can be transformed into a dry, valuable extension of your home — ideal for storage, utility, or conversion into living space.
At City Waterproofing Ltd., we specialise in high-performance cellar waterproofing systems designed to protect below-ground spaces from moisture and flooding.
Why Are Cellars Prone to Damp?
Due to their below-ground construction, cellars are naturally vulnerable to damp and groundwater intrusion. Moisture from the surrounding soil can penetrate through walls and floors over time. This is made worse by:
- Poor external drainage
- High water tables
- Older building materials (e.g. porous bricks or no DPC)
- Heavy rainfall and hydrostatic pressure
- Cracks or weak points in the structure
Cellar dampness often manifests as wet walls, musty odours, peeling paint, salt deposits (efflorescence), or even pooling water. Without intervention, it can lead to mould growth, timber decay, and loss of property value.
Professional Cellar Waterproofing Systems
All our cellar waterproofing installations are carried out in line with BS 8102:2022, the British Standard for protecting below-ground structures against water ingress.
We tailor each system based on your property's condition and your plans for the space, such as:
- Dry storage
- Wine cellar
- Utility/laundry room
- Additional living or office space
Waterproofing Methods We Use
Type A (Tanking) System
This method involves applying a cementitious tanking slurry or waterproof render directly to walls and floors. It forms a barrier that stops water entering through the structure.
Best for: Simpler storage conversions or where surface preparation is feasible
Limitations: Can crack with movement or fail under pressure if not properly bonded
Type C (Cavity Drainage Membrane)
This is the most reliable and popular waterproofing solution. A cavity drain membrane is installed to the internal surfaces, creating a sealed void that channels water into a sump and pump system or existing drainage.
Advantages:
- Little to no surface preparation
- Minimal disruption
- Compatible with dry lining systems
- Ideal for full cellar conversions
Why Choose City Waterproofing Ltd.?
- Cellar specialists with decades of experience in London
- Certified installation of BS 8102-compliant systems
- Damp surveys and waterproofing design tailored to your property
- Fully guaranteed work and materials
- Friendly, professional, and efficient service
Ready to Waterproof Your Cellar?
Whether your cellar is currently unusable due to damp, or you're planning a full conversion, City Waterproofing Ltd. can help you unlock the space's full potential.
Contact us today to arrange a no-obligation cellar survey and get expert advice on the right waterproofing system for your property.