Newton Waterproofing: 21 basements in one project

  • 19 May 2022

The £6.7 million Rectory Gardens development is in the prestigious Clapham Old Town area of South London. Delivered in five phases, it included the redevelopment of Rectory Gardens and Grove, building three new houses and refurbishing 29 existing houses, 21 of which required basement extensions. Newton Approved Contractor Edgeley Construction were appointed as Design & Build Contractor to deliver the whole scheme for Lexadon Property Group, and immediately collaborated with Newton on the waterproofing solution.

The waterproofing was made more complicated by the high flood risk, high water table, unstable ground conditions, and also the sequencing of the work meaning that different basements were completed at different stages.

The Solution

Various solutions were employed throughout the 21-basement scheme. These included the use of HydroSeal 203-RM and 313-WP to stop the initial water leaks. The Newton HydroBond System then provided Type A waterproofing protection with the HydroBond 403 Plus membrane pre-applied under the concrete slab, and the cementitious HydroSeal 107 Elastic 2K membrane applied to the underpinning and the retaining concrete block walls.

Type B protection was also provided in the construction joins with HydroTank 315 Waterbar. Complete peace of mind was delivered with a full internal Newton CDM cavity drain membrane system to capture and remove ingressing water and ensure a completely dry internal environment.

The Result

Edgeley have brought these houses into the 21st century, simultaneously preserving their heritage and upgrading their performance to modern standards. Furthermore, by considering all risk factors, all 21 dry basements have also been delivered, with Newton sourcing an Insurance Backed Guarantee for Edgeley to pass further protection on to the client.

James Brett, Managing Director at Edgeley Construction, comments: “It’s been a joy to partner with Newton Waterproofing Systems on this scheme in order to collaboratively specify a robust and insurance backed project for our clients.”


The Products


The most reliable waterproofing solution for any space below ground, the Newton CDM System combines decades of experience with the highest quality BBA certified membranes, bespoke sump and pump configurations, battery back-up systems, remote telemetry options, and ancillaries.


BDA Agrément certified, self-healing sheet membrane that provides a complete waterproof envelope around a structure. The gas barrier variant also provides resistance to radon, carbon dioxide and hydrocarbons in below-ground scenarios.


BDA Agrément certified cementitious membrane that is tough and flexible, for the waterproofing and protection of concrete and masonry. Suited to the waterproofing of reservoirs, tunnels, water tanks, basements, podium decks, flat roofs and balconies.


Single-component, fast-setting structural repair mortar that is is physically and chemically compatible with the host concrete. Highly adhesive and with great compressive strength, it is ideal for roads, runways, bridges, decks, floors and footpaths.


A single-component polymer compound that instantly stops running water or seepage through masonry or concrete. The non-shrink material sets in minutes and even becomes harder and more resistant when subjected to water pressure.


The Newton HydroTank System ensures that the structure is the primary resistance to water ingress, in this case by utilising the BDA Agrément certified HydroTank 315 Waterbar that swells in contact with water to seal the construction joints.

Newton Specialist Basement Contractors

Newton recommends that its systems are installed by one of its nationwide network of Newton Specialist Basement Contractors (NSBCs). Trained by Newton, NSBCs offer a full guarantee on the design and installation, and can act as Waterproofing Design Specialists.

Newton Waterproofing Systems,
Newton House,
17-20 Sovereign Way,
United Kingdom,

Phone: 01732 360 095
Fax: 01732 359 033
E-mail: [email protected]


Visit Newton Waterproofing System's website

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