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To assist the specifier in deciding on the correct waterproofing specification, the Newton Waterproofing Index (or ‘NWI’) is a unique waterproofing specification tool, has been developed as a means of assessing the ability of a waterproofing specification to successfully protect an earth-retaining or below-ground structure.
The Newton Waterproofing Index
The Newton Waterproofing Index is a unique specification tool in the construction industry, providing specifiers and designers with a scoring system through which it is possible to accurately assess the level of risk and potential success involved in a waterproofing design. The Newton Waterproofing Index (NWI) is the UK’s first and only waterproofing specification tool that enables specifiers and designers to assess the risk and success potential of waterproofing strategies for earth-retaining or below-ground structures. The NWI delivers a quantifiable score that aligns with the British Standard 8102:2022 internal environment grades—Grades 1a, 1b, 2, and 3—making specification assessments clearer and more objective.
How The NWI Works
NWI scores are awarded by Newton’s experienced waterproofing specialists and independently audited by Newton’s insurer, yielding a trusted evaluation of specification performance. Rather than a single score, each design receives a scoring range:
- Lower score: Likely outcome with less-than-perfect workmanship.
- Upper score: Potential when installed by a trained specialist.
This dual-range format reflects real-world installation variability and encourages safer design choices.
Supporting Resources: Solution Sheets
Newton’s Solution Sheets work hand-in-hand with the NWI, offering specifiers downloadable, ready‑made design packages. Each includes:
- Detailed product information
- Relevant NBS clauses
- 2D/3D visuals
- NWI scoring range for easy comparison of design robustness
Newton Protected Basement
Designs achieving the highest possible NWI score (4.0) become eligible for the Newton Protected Basement specification. This premium package includes Type A, B, and C waterproofing, installation by a Newton Specialist Basement Contractor (NSBC), covering product, design, and installation.
Warren Muschialli, Managing Director:“We’re delighted to introduce the Newton Protected Basement and Waterproofing Index to the UK waterproofing industry. Newton and our Specialist Basement Contractors can now provide specifiers, developers and contractors with a guaranteed specification that provides A-rated cover on the design, products and installation. For the UK waterproofing market this is a ground breaking innovation and it highlights Newton’s ongoing campaign to improve standards throughout the industry”
