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Cavity drain waterproofing (defined as Type C (drained) protection) relies heavily on a properly designed and installed drainage system. Because effective water management is critical for the success of a cavity drain waterproofing system, understanding how to correctly install and maintain the drainage system is essential for achieving long-lasting basement protection.
This guide explores the comprehensive process of installing a cavity drainage system, focusing on best practices and key considerations for successful implementation.
Before diving into installation procedures, it’s important to understand what constitutes a cavity drainage system. The Newton CDM System, an example of a comprehensive Type C, cavity drain waterproofing solution, comprises four main components:
When designing a Type C system, each component plays a vital role in creating an effective water management solution.
Cavity drainage systems are classified as ‘Type C’ waterproofing by the British Standard for waterproofing, BS 8102:2022. Unlike Type A and Type B waterproofing solutions, Type C offers a maintainable solution that manages water ingress rather than attempting to block it.
Instead, the Type C system receives water at the point of entry and uses drainage to direct it to a safe point of removal. This approach makes cavity drain waterproofing one of the most reliable and safe forms of below-ground waterproofing.
If you are planning on using a cavity drainage system as part of your overall waterproofing solution, there are some key factors that must be considered during the design of the system, to ensure a successful installation:
The pumping system must be robust and reliable, incorporating both primary and backup pumps, battery backup systems, and high-level alarms. However, the long-term success of a cavity drainage system depends on regular maintenance.
The pumping system should have its first service within 3 months of being commissioned, and at this point a future service schedule should be agreed between the service engineer and the client. The servicing and maintenance of Type C systems should be carried out by trained, competent service engineers, with a good knowledge of Type C waterproofing and access to the specific details of the installed system to ensure its continued effectiveness.
British Standard BS 8102:2022 recommends combining different waterproofing types for improved protection. Depending on the scenario, the Newton CDM System can be effectively integrated with the HydroBond Type A external, HydroCoat Type A internal and HydroTank Type B integral waterproofing systems to provide superior protection against water ingress.
Working with qualified contractors is essential for successful system installation. As well as our comprehensive technical support, including design assistance, installation guidance, and ongoing maintenance advice, our nationwide network of Newton Specialist Basement Contractors (NSBCs) work in partnership with us to provide the highest quality products, design, and installation in all aspects of domestic and commercial basement waterproofing, supported by their own installation guarantees. This professional network of contractors ensures systems are installed to the highest standards and maintain their effectiveness over time.
Post-installation testing is crucial for verifying system effectiveness. This includes comprehensive flow testing, pump operation verification, and alarm system checks. Proper documentation of all testing and installation details provides a valuable reference for future maintenance and modifications.
With proper installation and maintenance, a cavity drainage system provides the most reliable and maintainable solution for basement waterproofing. Professional installation by qualified contractors, combined with regular maintenance, is key to ensuring your system’s long-term effectiveness and protecting your investment in below-ground spaces.
Contact Newton Waterproofing’s technical team today for comprehensive support in designing and installing your basement drainage system. Our specialists will ensure your installation meets all relevant standards and provides reliable, long-term protection for your below-ground space.
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.