Basement waterproofing for a residential home in Chelsea


Client: Donovan Construction

Products Used: Delta Kosher NB1 Slurry, Cavity Drainage Membrane, Perimeter Drainage Channel,

Timberwise were contacted by Donovan Construction to design and implement a basement waterproofing solution for a home that was in mid-construction. The newly-built home was to be situated in a quiet area of Chelsea and intertwined between the handsome red brick buildings in the area.

Within London, in particular Kensington and Chelsea, Timberwise have seen a sharp rise in basement conversions over the past decade. These ‘iceberg homes’ offer astonishing amenities such as home cinemas, garages and swimming pools. This particular basement construction was intended for further living accommodation so, the waterproofing specification had to reflect this.

Did you know?

The King’s Road, named after Charles II, was built to connect his palace in Whitehall to Hampton Court. By the 1960s, Chelsea and, in particular, the King’s Road, became the centrepiece of mod culture and the Swinging Sixties in the UK. It was often frequented by cultural icons such as Twiggy and Andy Warhol.

External Waterproofing

External waterproofing was carried out using Delta Koster NB1 slurry, designed for new construction. The slurry protects the new-build from pressurised and non-pressurised water. Before the slurry was applied, the walls were prepared using Polysil TG 500. This ‘anti-lime’ coating acts as a liquid hardener for sealing slurries and ensures no future problems of lime-scale

Fantastic project! The integrity of this building lies in our hands, and we’ll do everything to make sure its a safe and dry for the future

Keith Defoe, Waterproofing Specialist

Internal Waterproofing

Cavity Drainage Membrane

Delta MS500 Cavity Drain Membrane was curtain hung on the walls to full height, in order to allow water ingress behind the membrane.

Perimeter Drainage Channel

Installed at the base of the wall-floor  junction, the channel collects water at the bottom of the membrane and then via gravity disperses around the perimeter of the basement to the sump pump. The sump chamber and pumping system pump the water our of the basement. Fixed within the floor, the chamber is then easily accessible for inspection and maintenance


Once the home was completely finished, the basement became a home cinema making for a relaxing and comfortable place to unwind, with enough room for numerous people to relax and enjoy the newly installed sound system and flat screen TV.

Contact Our Basement Waterproofing Design Specialists

All our basement solutions also benefit from our design and installation services along with our long-term insurance backed guarantees. This ensures you have complete peace of mind that your basement will remain dry for the years to come.

You can trust Timberwise to provide you with the right basement waterproofing systems to solve your damp basement problem. Don’t hesitate to contact Timberwise via our form above, by calling on 0800 288 8660 or you can request a survey online.

A survey through Timberwise will allow our waterproofing contractors to be able to identify the full extent of the problem and determine whether further basement solutions may be necessary for your property.