Beltane Drive

30 June 2020


Basement type: Retrofit Building type: Residential
Type of waterproofing: Type A & C Member: Sika
Other: Heritage  

In 2019 Renderseal Ltd worked alongside main contractor, Crystal Clear Building Solutions, to waterproof a basement and swimming pool at a property on Beltane Drive, Wimbledon. This was an extension project of approx. 250m2.


Although the basement and swimming pool at Beltane Drive had been cast in waterproof concrete, the client required a second waterproofing system to be installed. Due to the property’s construction stage, external waterproofing was not an option.

In addition, the client did not want the responsibility or cost of ongoing pump maintenance and the subsequent upkeep required with checking a cavity drain membrane system in the basement area.


The solution was to waterproof the basement and swimming pool using the Sika®-1 Pre-Bagged Waterproof System, meaning there would be no requirement for drainage products, ancillary equipment or maintenance.

To minimise dust, nuisance and vibration exposure to operatives working on the residential project, a wet grit blast with a high-pressure jet wash was chosen for surface preparation.

Sika®-1 Pre-Bagged Waterproof System was used to control water ingress and successfully waterproof the basement and swimming pool, completing the project in a timely manner without complications.

The installation system also incorporated the high-performance joint sealing system, Sikadur®- Combiflex® SG, at all construction joints to add extra protection to these higher risk areas.

The Sika®-1 Pre-Bagged Waterproofing System was specified due to its proven track record and BBA-certification. The product consists of watertight renders and screeds produced by mixing diluted Sika®-1 Waterproofing Liquid and Sika®-1 Pre-Batched Mortars.

Renderseal Ltd offered the client peace of mind and completed the job without complication.