Wales
Basement Tanking in South Glamorgan
Cementitious tanking and cavity drain systems for basements, cellars and below-ground rooms.
If you are weighing up basement tanking in South Glamorgan, the starting point is what your walls are actually built from.
Across South Glamorgan, Victorian and Edwardian terraces, Cardiff suburban housing and coastal properties dominates, and solid-wall terrace damp and coastal weathering at Barry and Penarth is what we are called out to most often. The area sees wet with coastal exposure along the Severn estuary, which is the single biggest factor in how long any render lasts here.
Local factor. Cardiff's victorian terraces are largely solid-wall, and external insulation with a breathable render is the upgrade that suits them best.
Is basement tanking right for a South Glamorgan property?
Choose tanking for cellar and basement conversions, persistently wet below-ground rooms, and any space you intend to make habitable.
That decision gets made at the survey, not on the phone. We will tell you plainly if a different system would serve the building better — including when a cheaper one would.
Guide price and specification
| Guide price | £115–£195 per m² |
|---|---|
| Applied thickness | Multi-coat cementitious system |
| Curing / drying | 7-14 days |
| Guarantee | 20 years |
| Coverage | All of South Glamorgan — 10 towns and cities |
Indicative only, excluding scaffold, stripping and repairs. Try the guide-price tool for a range based on your property.
What is included
- Cementitious tanking slurries
- Cavity drain membrane systems
- Sump and pump installation
- Type A and Type C waterproofing
- Fillets and junction detailing
- Withstands hydrostatic pressure
- Suitable for habitable conversion
- Salt and negative pressure resistant
Basement Tanking across South Glamorgan
Basement Tanking in South Glamorgan
Tell us about the property and we will call you back to arrange a survey.
Other services in South Glamorgan
What happens next
Four steps from enquiry to finished wall
Free survey
We visit, test the substrate, measure up and identify what caused any existing failure.
Written quote
An itemised fixed price with the system named, materials specified and scaffold included.
Booked in
An agreed start date, scaffold arranged, and a clear run of days set aside for your job.
Finished and guaranteed
Site cleared, scaffold struck, guarantee documents and system warranty issued.
FAQs
Basement Tanking in South Glamorgan — questions
What time of year is best for rendering?
Spring through autumn is ideal. Render should not be applied in frost or in very hot direct sun, so winter work needs protection and settled conditions.
Can you render over existing render?
Sometimes, if the existing coat is completely sound and well-bonded. We hammer-test it first. Anything hollow has to come off, because covering failure just hides it.
Are you insured?
Yes — full public liability cover, and we can send the certificate before we start. We are happy to provide RAMS for commercial and contractor work.
What areas do you cover?
We work UK-wide, with teams across England, Scotland, Wales and Northern Ireland. If we are not the right firm for your location we will tell you rather than waste your time.
What is the difference between Type A and Type C waterproofing?
Type A is a bonded barrier that keeps water out entirely. Type C accepts ingress, then drains and pumps it away behind a membrane. Type C is more forgiving of structural imperfections.
Does a tanked basement need a pump?
A Type C cavity drain system does — it relies on a sump and pump. A Type A barrier system does not, though a pump is sometimes added as a backup.
Basement Tanking quotes across South Glamorgan
Free survey, honest advice on whether this is the right system, and a fixed written price.