Our Technical Department receives hundreds of enquiries a week about the best strategy for waterproofing new-build basements. The waterproofing method adopted for a new-build basement requires careful consideration as failure to make the correct decision can have a major impact on the effectiveness of the system and the potential use of the basement. In addition, consideration has to be made for the repair of the waterproofing system if failure were to occur and the consequential loss and the legal disputes resulting from the failure.
Above: Newton Waterproofing Systems were used to waterproof 193 houses and apartments in a Crest Nicholson housing development in Sunbury-on-Thames. Insert: Newton 403 HydroBond installed to provide Type A (Barrier) protection
In deciding the method for waterproofing a new-build basement it is advisable to follow the recommendations within BS 8102:2009 ‘Code of Practice for Protection of Below Ground Structures Against Water From the Ground’. The standard advises on the types of waterproofing available and confirms the performance grade to be achieved:
Type A (Barrier) protection – A barrier to water ingress is applied to the inner or outer surface of the structure
Type B (Structurally Integral) protection – The structure is formed as a watertight construction and requires no additional protection
Type C (Drained) protection – Water entering the structure is received by planned cavities or voids and safely removed
Grade 1 – Some water seepage and damp is tolerable depending on the intended use - Car parks, plant rooms etc.
Grade 2 – No water penetration is acceptable. Damp areas are tolerable depending on the end use - Plant rooms, workshops etc.
Grade 3 – No dampness or water penetration is acceptable – Ventilated residential and commercial areas such as homes, offices, shops etc.
Other waterproofing requirements such as protection at podium decks, pile caps etc. can be successfully waterproofed using Newton waterproofing systems, often using a combination of systems and products.
Whether waterproofing a new-build basement or an existing structure, we will always recommend that the preferred waterproofing system be installed by one of our registered contractors. When involved in the design they are able to offer insured guarantees for both the installation and the design of the waterproofing system, and with most of our contractors having suitable PI, this allows you to delegate the full design liability for the waterproofing aspect of the project to them. NSBCs are able to fulfil the role of waterproofing specialist as suggested by BS 8102:2009 and we see that waterproofing contracts run more smoothly and have less issues where one of our NSBC contractors are also the waterproofing design specialist on the design 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.
Newton Specialist Basement Contractors (NSBC) are an elite group of professional structural waterproofing and damp proofing specialists who work in partnership with us to provide clients with the best products, design and installation.