Waterproofing
Basement waterproofing
Design and installation of waterproofing systems for basements and cellars.
What the issue is
Below-ground spaces need a waterproofing approach designed for the water conditions present, the intended use of the space and the risk of failure.
Common symptoms
- Water on the basement floor
- Damp or salted walls
- Standing water after heavy rain
- Musty smell
- Mould on stored items
Likely contributing factors
- Groundwater pressure
- Surface water drainage defects
- Failed historic tanking
- Cracks and construction joints
- High external ground levels
Conditions that may be mistaken for it
- Condensation in a cool basement
- A plumbing leak
- Penetrating damp above ground level
How the issue should be investigated
- Assess water entry points and patterns
- Review external drainage and ground conditions
- Establish construction and existing systems
- Consider intended use and risk
Potential treatment or repair options
- Cavity drainage membrane systems with drainage and pumping
- Cementitious tanking where appropriate
- External drainage improvements
- Combined systems for higher-risk situations
- Ventilation and dehumidification
When treatment may not be appropriate
- Where a surface water or drainage defect can be corrected instead
- Where the space use does not justify a full system
Factors affecting the cost
- Floor and wall area
- System type and pump provision
- Electrical supply and drainage connection
- Finishes and reinstatement
- Access for materials and waste
What to expect during an inspection
A detailed assessment of the basement, external drainage and intended use, with discussion of realistic options.
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.