Refurbishing a Flooded Shop Basement, Chelsea

Summary

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  The system delivered a dry Grade 3 internal environment as per BS 8102

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  Now fitted out, the basement is part of a high-end commercial unit

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  The completed wine cellar located beneath the rear deck

This project revolved around refurbishing a flooded shop basement. 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 water was entering via defects in the shop front and pavement light wells. It was then travelling along a concealed steel joist and entering the centre of the basement.

The Solution

Externally, Garratt’s suggested removing the shop front.

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 suggested and installed the failsafe Newton CDM System to provide a complete BBA-certified drain waterproofing solution. This included the BBA-certified CDM 508 and CDM 520 eco Floor membranes. Garratt’s also installed a dedicated Titan-Pro sump chamber to remove water from the basement.

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

The Result

By working closely with Newton Waterproofing and the main contractor, Garratt’s delivered a bespoke waterproofing solution. Garratt’s preserved the original shop front, restoring it in the process. It also delivered a completely dry, Grade 3 internal environment, meeting the requirements of British Standard 8102.

Testimonial

“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.