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Project Details

New Malden, Surrey Dry Waterproofing Ltd was commissioned by the client to provide a robust and guaranteed structural waterproofing system for this new build basement, which is to be used as an extended part to their upper level new addition. The form of construction consists of contiguous piles with shuttered reinforced concrete walls in front and a reinforced concrete floor slab, thus creating a concrete box.

A token start/attempt by the clients building contractor (who went bust on this project) to waterproof the basement was distressing to say the least. Our recommendation was to use the Newton cavity drain membrane system with perimeter drainage channels and the Newton sump and pump drainage facility. However, it was evident from observations made during our inspection of the basement that ground water seepage through construction joints in walls and at the wall/floor junctions needed to be addressed prior to installing the Newton cavity membrane system.

Methodology

Cavity drainage membranes are capable of dealing with significant amounts of water flow because of their studded/cupped design, but wherever running water is seen entering the structure during survey/assessment stage, Dry Waterproofing Ltd always recommends that efforts be made to stop or slow down water ingress.

This not only provides a first line of defence and aid control, but also helps reduce the number of pumping cycles and prolongs the life span of the pumps.

As part of the overall scheme of waterproofing this basement, Dry Waterproofing Ltd applied Newton 102 waterplug compound, as well as Newton 101F, which is a hydraulic rapid setting cementitious product that stems the water flow permeating through the structural joints and cementitious tanking slurry.

After this, the walls and floor surfaces were treated with Newton lime scale inhibiter by spray application, to prevent/reduce lime scale forming.

The Newton Titan-Pro White sump pump system was then installed, which consisted of a pre-formed sump liner, two submersible pumps, a battery back-up facility also a pumps control panel with a high water level alarm.

Newton 508 (8mm studded) cavity drain membrane was then mechanically fixed to the walls with the Newton multi-plugs using the ‘curtain wall’ hanging method (this method of installation requires less fixings when the walls are being independently dry lined with a ‘fast track’ metal stud dry lining system in front).

Newton perimeter drainage channel (BaseDrain) incorporating jetting ports and a condensation strip was then fitted against the wall membrane at the base of the walls and linked to the sump and pump chamber.

Finally, close cell floor insulation was then mechanically fixed with screws and washers to the floor slab (this method is carried out when floating floors such as flooring grade chipboard is being used as a floor finish) as was the case hear, and the floor insulation was then overlaid with Newton 508 floor membrane, which was then sealed to walls and around the sump chamber with Newton preparatory sealing ropes/tapes/overtape.

New Build Basement videos

New Build Basement

New Build Basement

New Build Basement

New Build Basement

New Build Basement

New Build Basement

New Build Basement

New Build Basement

Result:

A fast track sympathetic approach to waterproofing this below ground structure was achieved, and to enable the client’s builder to install an independent metal track dry lining system without fear of compromising the waterproofing systems, with the client benefiting from having a long term meaningful guarantee