Basement tanking is a traditional form of basement waterproofing and is generally what you will find in older properties.
In the past, when buildings were constructed, stone foundations were often laid with little or no mortar between them to seal the gaps and, because of hydrostatic pressure from the surrounding earth, the walls of these structures would leak. Basement tanking was developed to stop this leaking.
A lining or ‘slurry’ is put on the walls so that it forms a ‘tank’ around the basement which creates a barrier to prevent water getting in. The lining gives a smooth, seamless wall surface which looks good and also provides moisture control.
How tanking works
When people reffer to basement tanking they usually mean cement coatings - although the term can also be used to describe bitumin coating, epoxy resins, paints or sealants.
Tanking systems that use a coating like cement are known as “Type A” basement waterproofing systems under BS8102 (the industry guidelines for structural waterproofing). Type A means that these systems do not remove water, they simply create a barrier.
When tanking is applied to stable masonry, and special care has been taken at weak points in the structure such as the wall to floor junction, it should be completely watertight.
Problems associated with tanking
Correctly installed basement tanking will stop all water ingress into a basement but there are a few potential problems that should be highlighted before recommending a tanking solution.
Cracks can develop in the tanking systems due to the property settling - making "Type A" basement waterproofing less than ideal for new build properties.
Another problem that tanking can face is cracks caused by underground vibrations. If your property is close to a railway line, underground or busy road, the ground vibratations caused by passing vehicles can cause cracks to appear in the lining.
When tanking is not the best option, or your property has tanking that has previously failed, then there are other basement waterproofing options that may be a wiser choice.
Alternatives to basement tanking
Contact a tanking specialist
For additional information on basement tanking and basement tanking alternatives contact us today on 0808 256 4538 or email us using our online contact form.
Alternatively, you can request a basement and cellar survey online or look at the links below for further information.
Related basement information
- Exterior basement waterproofing: Find out about the exterior basement waterproofing systems available for your property
- Interior basement waterproofing: Find out about the interior basement waterproofing systems that are available.
- Failed tanking: Find out more about what happens when tanking systems fail.
- Replacing a tanking system: Find out how we replace failed tanking with modern waterproofing methods.