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This solution has the capability of achieving an NWI score of 4.0, by employing 3 forms of waterproofing (Type A – Barrier Protection) and (Type B – Integral Protection) to limit ground water ingressing behind the (Type C – Drained Protection) to ensure that the desired internal environment is achieved.
With three forms of waterproofing, this specification provides the safest possible waterproofing design of Types A, B & C, as defined within BS 8102:2009, the Code of Practice for the protection of below ground structures against water from the ground.
Where possible, we would recommend a reinforced concrete structure designed to BS EN 1992 (Eurocode 2) and that it is of sufficient mass and quality to resist heads of water pressure as recommended by BS 8102:2009, the only place that water will enter is at the joints, basically where the concrete isn’t.
The structure should be designed to be as watertight as possible, even where Type C cavity drain membrane system are to be used, as although they are able to deal with high levels of water ingress, it is good practice to ensure that they are only dealing with seepage that manages to pass through the structure.
For more information about NWI scores and how they can help with your project design, read our page explaining the Newton Waterproofing Index and how it works.
Type A – Provide a Complete and Continuous Waterproof Barrier to the External Surface
Pre-apply Newton 403 HydroBond ready for the reinforced concrete slab. 403 HydroBond is a high-performance composite sheet membrane featuring a locking fleece and a polymer-hydrophilic coating.
Type B – Prevent Water Ingress Through the Construction Joints and Service Penetrations
Install Newton 315 Polymer-Waterbar to all construction joints to limit water ingress through joints in the structure. 315 Polymer-Waterbar is a high-grade, hydrophilic waterbar with high elasticity and high tensile strength. Then, mechanically fix Newton 302 Injection Hose with Hose Clamps ready for concrete placement. 302 Injection Hose is used for sealing construction joints in earth-retaining concrete structures.
Type C – Isolate the Internal Habitable Space from Dampness and Water Ingress
Apply the Newton CDM System internally, including a safe means of drainage to remove any ingressing water. The Newton CDM System comprises of cavity drain membranes, drainage, pumps and control systems and is ideal for projects where a completely dry internal environment is required.
To obtain the full Solution Sheet for this specification, including Technical Drawings and NBS Clauses, or to find a solution suitable for your project, please fill out the form below or email our Technical Team at email@example.com.
Our staff are able to provide guidance for projects of all sizes, whether you require some general advice about damp or waterproofing, or support with technical drawings and specifications.