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This solution has the capability of achieving an NWI score of 3.0, by employing 2 forms of waterproofing (Type A – Barrier Protection) and (Type B – Integral Protection) to prevent ground water passing through to the structural elements of the building.
Although Type A & B provides two forms of waterproofing, the risk of water ingress due to defects and or workmanship is reasonably high and so, as advised within BS 8102:2009, consideration should be given to maintainability and repairability.
Contingency planning for dealing with any localised defects or system failures should be included as part of the overall water-resisting design for the structure. The issue of repairability should also be taken into account and the feasibility of remedial measures assessed. Consider re-usable injection waterbar systems and internal Type C waterproofing.
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 B – Prevent Water Ingress at Construction Joints and Service Penetrations
Install Newton 315 Polymer-Waterbar to all construction joints to limit water ingress through joints in the structure. Newton 315 Polymer-Waterbar is a high-grade, hydrophilic waterbar with high elasticity and high tensile strength.
Type A – Provide a Complete and Continuous Waterproof Barrier to the External Surface
Pre-apply Newton 403 HydroBond ready for the placement of the concrete raft. Newton 403 HydroBond is a high-performance composite sheet membrane featuring a locking fleece and a polymer hydrophilic coating.
To improve the NWI score and provide a Grade 3 environment install the Newton CDM System as per Newton Solution ABC-06.
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 firstname.lastname@example.org.
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.