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As waterproofing experts, we are often asked about how to waterproof concrete. First though it’s important to define what concrete waterproofing actually is: Concrete waterproofing is where the concrete structure provides sufficient protection against ground water ingress to deliver the required waterproofing performance that is suitable for the intended use of the basement space, without the need for other methods of waterproofing.
Type B (integral), is one of the three types of waterproofing described by British Standard 8102:2022, and the standard describes how “Structures providing Type B protection should be constructed of reinforced concrete …… and designed in accordance with the relevant part of BS EN 1992 (all parts)…”
This comprehensive guide will focus on how to waterproof concrete, whilst also discussing the other types of waterproofing defined within BS 8102:2022. These other types of waterproofing systems can be used alongside concrete waterproofing to provide enhanced performance against groundwater ingress.
The success of any concrete waterproofing project begins with a thorough assessment of requirements and site conditions. Key factors that must be considered include:
Understanding the soil composition, groundwater levels, ground gas risk, and potential water pressure caused by higher surrounding ground levels is crucial for selecting appropriate waterproofing systems. We always design waterproofing solutions on the assumption that the structure will be subject to a full head of water pressure at some point in its design life. A thorough site investigation is therefore valuable in helping to determine most suitable methods of protection.
The intended use of the space and required internal environment will determine the necessary level of waterproofing protection. British Standard BS 8102:2022 defines different grades of waterproofing protection based on usage requirements, from basic utility areas to high-grade habitable spaces requiring completely dry environments.
The construction approach, whether new-build or renovation, will impact the selection of waterproofing systems. Different methods may be more suitable for certain construction techniques or existing structural conditions. Factors such as accessibility, structural limitations, and installation constraints must be carefully evaluated.
British Standard 8102:2022 outlines three main types of structural waterproofing, each with distinct characteristics and applications:
Type A waterproofing involves applying protective barriers, either internally or externally, to resist water ingress. For example, the Newton HydroBond System provides external protection through pre-applied or post-applied membranes, creating a continuous waterproof layer around the structure. For internal applications, the Newton HydroCoat System offers advanced liquid-applied coating solutions that can be applied directly to finished concrete surfaces.
These barrier systems are particularly effective when:
The success of Type A systems depends heavily on proper surface preparation and application techniques. The membrane must be continuous and properly sealed at all joints and penetrations to ensure complete protection.
The Newton HydroTank System represents Type B waterproofing, where the structure itself acts as the primary water barrier. This approach requires careful attention to:
The effectiveness of Type B systems relies heavily on proper concrete placement and joint detailing, making it particularly suitable for new construction projects where quality control can be closely monitored. The concrete must be designed to achieve low permeability while maintaining workability and proper curing conditions.
The Newton CDM System exemplifies Type C waterproofing, which takes a different approach by managing water ingress through controlled drainage. This comprehensive system includes:
Combination waterproofing involves using multiple types of protection systems to provide multiple forms of protection and improve the overall effectiveness of the waterproofing solution. BS 8102:2022 specifically recommends this approach when:
Our Technical Team frequently recommends combining different systems to provide superior protection. For example, on new-build projects or where the contractor has access to the external face of the below-ground structure, the HydroBond System (Type A) can be effectively combined with the CDM System (Type C) to create a robust waterproofing solution that utilises both water barrier and water management systems.
The effectiveness of any waterproofing system, but particularly Type A waterproofing membranes, depends heavily on proper surface preparation. Concrete surfaces must be:
Special attention must be paid to potential weak points in the waterproofing system:
Various environmental factors can impact waterproofing performance:
Professional installation and technical support are crucial for system success. Our team of technical experts will provide:
Furthermore, alongside our network of approved Specialist Basement Contractors, the Waterproofing Design Partnership provides a comprehensive waterproofing design service, backed by professional indemnity insurance and installation guarantees, including:
Ensuring lasting protection requires ongoing attention to maintenance:
Scheduled inspections should check for:
Implementing a preventive maintenance programme helps avoid costly repairs through:
By understanding these various aspects of concrete waterproofing and working with experienced professionals, you can ensure your project achieves the necessary level of protection while meeting all relevant standards and specifications. Remember that successful waterproofing is not just about selecting the right products – it’s about implementing a comprehensive system that addresses all potential water ingress risks while providing long-term, maintainable protection for your structure.
Contact Newton Waterproofing’s technical team today to discuss your project requirements and receive tailored advice on the most appropriate waterproofing system for your needs. Our specialists can help you design an effective solution that provides lasting protection and peace of mind, ensuring your concrete structure remains dry and protected for years to come.
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.