WATERTIGHT™
Waterproof Concrete System

An Expertly Engineered Concrete System for Water Protection and Retention

Watertight™ is a versatile range of specialised ready-mixed concrete, expertly designed by Holcim UK, to either protect a structure from water ingress or effectively retain water within a structure. This advanced system offers contractors and specifiers a competitive edge in both cost and time savings compared to traditional methods. Watertight™ provides a fast-track, robust solution that is fully compliant with BS 8102:2022 Type B construction and eliminates the need for complicated jointing or the risk of installation sensitivity to weather conditions.

Benefits      Why Watertight?      Applications      Specification      Related      Calculator      Contact Us

Benefits

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Fast Installation

Reduces installation time, offering a fast-track solution over traditional membrane or cavity drainage methods.

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All-Weather Use

Unlike membrane solutions, this system is not sensitive to weather conditions, ensuring project continuity.

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Holcim Warranty

A 10-year manufacturer's warranty is available upon request, giving you confidence to specify and use this unique product.

Why WATERTIGHT™

Watertight™, designed by Holcim UK, is an admixture-driven range of specialised concrete offering a reliable, cost-effective, and fast-track solution for structural Type B waterproofing. When correctly specified and constructed, Watertight™ is fully compliant with BS 8102:2022, providing a single line of defence that significantly reduces installation time and cost. Its performance is independent of weather conditions, unlike membrane solutions. 

Available as a pumpable or flowing mix in various slump and flow grades, Watertight™ is suitable for applications involving high hydraulic gradients, such as basements, car parks, service reservoirs, and swimming pools. Holcim UK can tailor the product to specific contract challenges, providing detailed technical advice and support. 

It conforms to the requirements of BS EN 206:2013+A2:2021 and complementary British Standards BS 8500-1:2023 and BS 8500-2:2023. Manufactured under independently monitored third-party quality assurance schemes in accordance with ISO 9001 and with factory environmental compliance to ISO 14001, Watertight™ can also be supplied with a 10-year manufacturer's warranty upon request.

Inside a large building with demolished material and concrete
Pool with a boat hung above it inside a large building
Pool with a boat hung above it inside a large building
APPLICATIONS
  • Basements & Cellars: Essential for creating dry, habitable living or commercial spaces below ground level.
  • Underground Car Parks: Used to protect the structure and vehicle contents from water ingress and degradation.
  • Water Treatment Plants: Ideal for structures like retention tanks and reservoirs where retaining water is critical.
  • Swimming Pools & Leisure Centres: Provides a guaranteed water-retaining concrete shell.
  • Lift Pits & Service Ducts: Used for small, critical containment areas where water ingress must be strictly prevented.
  • Tunnels and Subways: Applied in below-ground transit structures to maintain a dry environment.

key Specifications

Specification Detail

Value

Product TypeSpecialised Watertight Ready-Mixed Concrete
Key FeatureType B Waterproofing Construction
Compliance StandardFully Compliant with BS 8102:2022
Design & SupplyDesigned and supplied by Holcim UK
Warranty10-year manufacturer's warranty available on request
Installation MethodPumpable or Flowing mix options available
AdditivesSika® Watertight Concrete Powder, Sika 1+, or Sika WT200 P
ApplicationsWherever a significant hydraulic gradient is found

 

Available in strength classes fromC30 to C70
Flexural strength from5 N/mm2
High early strength by request30 N/mm2 at 24 hours

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