Waterproofing Residential Basement Extension

The scope of this project was to provide an effective, maintainable, and robust waterproofing solution to a below ground extension and underground garage to a residential home in Suffolk.

Delta Registered Installers, Oaks Damp Proofing Co Ltd along with Delta’s Technical Sales Consultant Paul Callaghan, were appointed as Waterproofing Specialists to undertake the waterproofing design and installation of the waterproofing solution.

Basement extensions provide opportunities for increasing a property’s footprint. Basement extensions have the potential to enhance living circumstances, from storage to additional bedrooms or pleasurable spaces, such as games rooms, libraries, or swimming pools. All structures, however damp, degraded or contaminated can be retrofitted into a dry, fully functioning habitable space.

Whether retrofitting a waterproofing system or installing a new waterproofing system, BS 8102:2022 protection of below ground structures against water ingress. Code of Practice should always be incorporated into the waterproofing design.

The qualified waterproofing design was to achieve grade-3 level and to incorporate two forms. Combination waterproofing systems (two forms) can offer optimal structural protection against water ingress. Where a combination of waterproofing protection is being used, the two systems should offer different performance characteristics to mitigate the risk of failure due to a common cause. The compatibility of the different protection types should be assessed in order to minimise the risks and negate the need for remedial measures.

A combination of two forms of waterproofing is preferred when designing a habitable space.