Smart terrace houses

Basement Structural Waterproofing

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Cavity Drain Membranes

Cavity Drain Membranes

Bensleys offers a full design installation service for basement structural waterproofing following British Standard BS8102, designated as ‘the protection of structures against water from the ground’.

We use cavity drain membrane systems, which are polyurethane plastic sheets with dimples moulded into them. These are fixed mechanically to the walls to create a cavity between the substrate and internal wallplaster finish, which allows any ingressing water to be collected and drained away from the property; if necessary, we can also install sump and pump systems in the floor structure.

If necessary, an insulation-backed plasterboard can be fitted to the cavity drain membrane system to increase the UV value of the wall structure. These works follow Property Care Association guidelines, with the system designed by Bensleys own qualified surveyors. These systems are covered by Bensleys standard guarantees which can be underwritten by the Guarantee Protection Insurance Ltd or Triton User Group as required.
Flood water
Flood water ingress, at a seafront property in Bexhill, this to the basement affecting the floors and surrounding wall areas.
Sump installation
The installation of a sump in preparation for a pump, in conjunction with a cavity drain membrane to the same basement.
Damp proof membrane on walls
Isola Cavity Plastic Platon Damp Proof Membrane to walls and floors of the same basement.
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Continuation of the installation of the same system and including to the perimeter of window opening.
Cementatious Tanking Membranes

Cementatious Tanking Membranes

Structural water proofing work in basement areas can also, depending on circumstances, be successful by using cementatious type membranes. These are modified cement slurries or multi coat renders applied to the internal face of the structure that prevent moisture ingress at the point of entry.

These systems are particularly successful on intricate wall surfaces and where sump and pump systems are not required within the floor structure, or when the walls are incapable of allowing a cavity drain membrane to be fitted successfully - for example, bungeroosh walls.

These systems also conform to British Standard BS8102 designated as ‘the protection of structures against water from the ground’ and will prevent damp affecting basements where installed.

This system can also covered by our standard long term guarantees.
Removing wall plasters
Bensleys operative in the process of removing wall plasters and renders, to a gable end elevation from the interior in preparation for a cementitious tanking membrane application.
wall preparation
The continuation of the preparation of the same wall, before the first coating.
Cementatious tanking membrane applied
After the first coat of render, Triton TT55 cementatious membrane application.
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Following on from the tanking membrane application replastered elevation.
External Ground Damp Proof Membrane

External Ground Damp Proof Membrane

Bensleys can install external damp proof membrane systems complete with suitable drainage to the perimeter of the building to newly constructed basements or where ground levels are lowered to the perimeter of an existing basement. These membrane systems will stop water before it enters the wall structure.
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External damp proof membrane in the process of being installed before back filling.
Resin membrane on steps
Resin membrane application to newly installed external concrete steps.
Trench and drainage outside
Trenches and drainage excavated in preparation and damp proof membrane fitted to the wall and before back filling.
External damp proof membrane construction in progress
External damp proof membrane to newly constructed basement areas in progress.