Technical Resources / The Newton Waterproofing Index (NWI)

The Newton Waterproofing Index

This revolutionary new methodology combines British Standard 8102 scores with the type and quality of structure and the type of protection used. It also takes into account the competence of installation to give an easy to understand score for each project. The very highest scores qualify as Newton Protected Basements with a high quality 10 year warranty from a UK Grade A insurer.

The Newton Waterproofing Index is a unique specification tool in the construction industry, providing specifers 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.

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  • The Scoring System

    The scoring system works in conjunction with the British Standard for waterproofing, which defines the three types of desired internal environment as Grades 1, 2 and 3. By reflecting these Grades in the scores, the Index makes it quick and easy to visually assess a design, from 0 through to 4.0.

    Once assessed by Newton, designs are appointed with a scoring range, due to the fact that even within an agreed specification, the effectiveness of the waterproofing depends on the competency of the installation. For ease, these scoring ranges will also be presented on a scale.

  • Tailored Specification Sheets

    Newton Specification Sheets are an integral tool within the Index, each bringing together key product information, NBS Clauses and 3D drawings into one complete resource.

    Each Newton Specifcation Sheet also carries an Index score that is defined by the specification and the structure to which it is applied.

The Scoring Scale
"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 groundbreaking innovation and it highlights Newton’s ongoing campaign to improve standards throughout the industry"

Warren Muschialli, Managing Director Newton Waterproofing Systems

The Newton Protected Basement

  • The Newton Protected Basement is a comprehensive package for waterproofing  new-build concrete structures, encompassing all three forms of waterproofing and professional installation by a Newton Specialist Basement Contractor.
    Newton Protected Basements are the only specifications that achieve the highest Index score of 4.0, allowing Newton to guarantee the project with a bespoke latent defects policy, including:
    10 years LDI cover with an A rated Lloyds insurer
    No defects liability period
    Up to £100,000 of cover per project for consequential loss*
    Cover for product, design and installation failures
    In-house design assistance and on-site quality assurance
    Independent auditing included where required, to ensure continued quality

    *For full information on the Newton Protected Basement Scheme please contact our Technical Team on 01732 360 095 or via