Waterproofing
Cementitious tanking
Applied cementitious waterproofing for suitable below-ground and internal applications.
What the issue is
Cementitious tanking is a bonded waterproof coating applied to prepared masonry or concrete. It suits sound substrates and situations where water pressure is understood and manageable.
Common symptoms
- Damp below-ground walls
- Salting and blown finishes
- Localised seepage
Likely contributing factors
- Groundwater pressure
- Absent original waterproofing
- Failed historic tanking
- Poor substrate preparation
Conditions that may be mistaken for it
- Condensation on cold below-ground walls
- Leaking services
How the issue should be investigated
- Assess substrate condition and soundness
- Establish water pressure and entry points
- Consider whether a drained system is more suitable
Potential treatment or repair options
- Substrate preparation and repair
- Multi-coat cementitious waterproofing
- Fillets and detailing at junctions
- Suitable finishing and decoration
When treatment may not be appropriate
- Where water pressure is high and a drained system is more appropriate
- Where the substrate cannot be adequately prepared
Factors affecting the cost
- Wall and floor area
- Substrate preparation required
- Number of coats and detailing
- Finishes and reinstatement
What to expect during an inspection
A survey of the substrate, water conditions and intended finishes to confirm whether tanking is appropriate.
Final recommendations always depend on the property, the inspection findings and the confirmed cause. Elevated readings alone do not confirm rising damp, not every mould problem requires extensive treatment, and damp-affected plaster does not always need replacing.
Frequently asked questions
Next step
Not sure which inspection you need? Start with a few questions.
Tell us what you are seeing and we will set out what is likely, what is uncertain and which inspection would answer the question. Speak to us on 0333 335 6152 if you would rather talk it through.