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Newton Specialist Contractor Garratt’s Damp and Timber provided their waterproofing expertise as part of the refurbishment of this high-end commercial property in the prestigious London Borough of Chelsea, as the basement area was experiencing high volumes of water ingress.

The Project

By performing a flood simulation Garratt’s identified that water was entering via defects in the shop front and pavement light wells, travelling along a concealed steel joist and entering the centre of the basement.

The Solution

Externally, Garratt’s recommended the shop front be removed, and worked with main contractor CJS and the Newton technical team to design a bespoke metal bund system to resolve the defects and prevent further water ingress.

The prepared concrete and steel was then treated with HydroCoat 903 Primer and waterproofed with three coats of Newton’s flexible cementitious waterproofing membrane HydroCoat 107 Elastic 2K.

Internally, Garratt’s recommended and installed the failsafe Newton CDM System to provide a comprehensive cavity drain waterproofing solution. This included the BBA certified CDM 508 and CDM 520 eco Floor membranes, and a dedicated Titan-Pro sump chamber for removing water from the basement.

The chamber houses dual CP250 pumps, managed by a Control Panel-Pro pump control unit and supported by Victron battery backup protection for complete peace of mind even in the event of a power outage.

The Result

By working in close cooperation with Newton Waterproofing and the main contractor, Garratt’s delivered a bespoke waterproofing solution that is both sympathetic to the original shop front (which was consequently restored) and also delivers a completely dry, Grade 3 internal environment as per British Standard 8102.

quotation marks

"Garratt’s were engaged to design and install a system to stop high volumes of water penetration through the pavement lights and walls on this tricky project. Replacing the pavement light was out of the question due to the busy street, and water was also penetrating the shop front and migrating along steels to a point that was impossible to waterproof. Through close collaboration with the experts at Newton, we implemented a full system to withstand any future flooding." - Jack Garratt CSSW CSRT, Consultant Surveyor - Garratt's Damp and Timber.

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