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The British Standard for Waterproofing, BS 8102:2022, defines three ‘Types’ of waterproofing:
The Newton HydroBond System is a high-performance, Type A waterproofing system designed to be applied to the outside of the structure. The system is either pre-applied below the concrete raft/slab and wall building line, or post-applied where conventional formwork is removed to expose the outside of the basement walls.
Once installed and, depending on the type of structure it is applied to, the combination of selected products within the HydroBond System can provide a continuous barrier around the full extent of the structure.
Depending on the products employed, the HydroBond System can provide protection against both groundwater and ground gasses such as radon, methane and carbon dioxide, making it the ideal solution where protection from any or all of these elements is required.
The BS 8102:2022 states in section 8 that membranes should be fully bonded to prevent lateral migration of water from a defect as per Figure 7. This can be tested by manufacturers to BS EN 1928 method A; and that the level of full bond is relevant to depth of use or water pressure
Sheet Membranes, pre-applied below raft/slab or to building line, prior to placement of reinforced concrete
Sheet Membranes, post-applied to walls after removal of formwork
Liquid-Applied Membranes, post-applied to walls after removal of formwork
HydroBond System Ancillary Products
The table below confirms which combination of products can be used together depending on the project requirements:
|Pre/applied below raft/slab||Pre-applied to walls||Post-applied to walls|
|Waterproofing only||HydroBond 403 Plus or HydroBond 402 CCS-M||HydroBond 403 Plus or HydroBond 402 CCS-M|| HydroBond 109-LM, HydroBond 2K-Flex and
|With radon protection||HydroBond 403 Plus GB or HydroBond 402 CCS-M||HydroBond 403 Plus GB or HydroBond 402 CCS-M|| HydroBond 109-LM and
|With methane/carbon dioxide protection||HydroBond 403 Plus GB or HydroBond 402 CCS-M||HydroBond 403 Plus GB or HydroBond 402 CCS-M||HydroBond SAGM combined with HydroBond 109-LM or HydroBond 2K-Flex|
Please note that in some cases, a combination of HydroBond 2K-Flex and HydroBond SA or HydroBond SAGM should be used together, especially where:
The waterproofing design should be undertaken by a waterproofing specialist, appointed as part of the design team so that an integrated waterproofing solution is created. The waterproofing specialist should:
If the RIBA stages are used, a waterproofing specialist should be appointed before the technical design stage at the latest.
A geology and hydrology assessment should be carried out, although the removal or drainage of groundwater should only be considered if it is safe and practical to do so, which in most cases will be where the basement structure is built within sloping ground.
Where there is no slope to allow for successful movement of the groundwater away from the building by gravity, and the ground investigations show a high-water table or an undetermined water table, it should be assumed that the ground could be fully saturated at some point in the future and that a full height of water pressure should be expected.
The waterproofing design should consider how the structure is to be constructed and from which materials, as well as the intended use of the below-ground space and the internal floor and wall finishes. Advice regarding the required ‘Grade’ of waterproofing can be found within the current version of the British Standard:
Waterproofing Design Specialists are tasked to determine the use of combined protection in various forms where, in a single system:
With this in mind, the possible combinations of waterproofing are:
Where a combination is being considered, systems should have different performance characteristics to mitigate the risk of failure due to a common cause. The compatibility of the different protection types should also be assessed in order to minimise the risks and negate the need for remedial measures
Where multiple forms of waterproofing are deemed to be required and depending on the form of structure to be waterproofed, the Newton HydroBond System can be used in conjunction with the following systems to deliver the required enhanced levels of waterproofing performance:
The Newton Waterproofing Index is a unique specification tool in the construction industry, providing specifiers and designers with a scoring system in order to accurately assess the level of risk and potential success involved in a waterproofing design.
Depending on the many considerations within BS 8102, some of which are highlighted above, the Newton HydroBond System can provide high-performance protection against groundwater and ground gasses, either as a standalone system for the lower grades of waterproofing performance or in conjunction with other Newton Waterproofing Systems where enhanced protection is required.
Having maintained our Professional Indemnity (PI) Insurance for waterproofing designs for over 20 years, Newton is also able to support specifiers with our bespoke waterproofing design service, backed by our insurers and our PI policy.
Our team of dedicated technical staff are all trained Certificated Surveyors in Structural Waterproofing (CSSW) and able to assist you with your project, from design to quality assurance visits and on-site training via our specialist site support team.
Contact Newton Waterproofing on 01732 360 095, or email firstname.lastname@example.org to speak to a member of our team.
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.