Basement Tanking London

Basement Waterproofing London

Basement waterproofing systems delivered by experienced London Contractor

Basement Tanking London Case Study

Basement Waterproofing London

Basement waterproofing systems delivered by experienced London building contractor

Basement Tanking London Case Study

Basement waterproofing London

Lovely basement conversion in London. Bringing light and space to an otherwise unusable space.

Project Type: Basement waterproofing

Project Location: London, Catford

Approx Value: £8,000

Project summary

This property was a 1930s end terrace property. The property is located on a hill incline with an undercroft located at the front lower ground end of the property. All properties on this area were of similar construction and shared the same challenges of combating damp and water ingress into the lower ground area of the property.
The dampness rendered the lower ground floor of the property barely unusable due to the constant slug infestation and damp smells.

Prior to starting the project, we installed a cavity drain damp proofing system to the undercroft on the property and created a dry, usuable bathroom and utility area.

The remit for this section of the property was to install a separate basement waterproofing system to encapsulate a newly installed kitchen.

water in basement


Installation of Newton 503 membrane with cavity drain system. Membrane mechanically fixed with newton Multi plugs to vertical wall which provide screw fixings through the membranes whilst maintaining water tightness.

We fixed horizontal battens to the multi plugs which enable us to install plasterboard to the walls. This formed the backing structure for the attachment of the kitchen wall units and cabinets.  The fixed battens to the multi plugs also served as a void to run services for electrical wiring for the kitchen work top plug sockets.

Installation of the condensation strip is then fixed to the base of wall membrane to capture condensation built up at the forward facing side of the wall membrane which condensates at the dew point behind the the boarded structure to fix the kitchen units.

waterproof basement flooring

The next phase is to install the base drain set into the concrete slab to capture water rising from the water table also capturing falling condensation and water ingress from the walls.

A horinzontal membrane is then laid atop the base drains and the right angle connection sealed with water seal tape.

The base drains then drain via gravity to an external soakaway in the garden. No requirment for a mechanical sump pump to  minimise installation and maintenance costs over the life span of the system.


A dry usable room ready to install a new kitchen. A successful basement waterproofing system provided to the client with a 10 year warranty (subject to annual maintenance).

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