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Sika is the market leader in concrete admixture technology, now the most widely used system of its type in the UK. Combining this with our concrete expertise means that Mick George Concrete are able to provide comprehensive watertight solutions for a wide range of projects.

The Sika® Watertight Concrete System offers a comprehensive solution for watertight structures. The system consists of concrete that has been specially modified with Sika admixtures to produce watertight concrete; and carefully selected waterstops for construction and movement joints. Watertight concrete structures can be designed to keep water in or out, or both. The need to maximise design flexibility has led owner and designer to look below ground as an alternative, whether for basement parking or a habitable environment.

  • Benefits
  • Typical projects
  • Mix Designs
  • Jointing Systems

The benefits of the Sika® Watertight Concrete System are clear:

- Time saved at design and construction stages as the need for external membranes with their complex detailing and installation is eliminated.

- Cost effective in comparison with membranes and other systems. Delivers maximum usable area to the occupier.

- Quality backed by Sika warranty, BBA certificate and a 60 years track record.

- Peace of mind for the client, specifier, contractor and end user of the building. So confident are we in the performance of Sika® Watertight Concrete System that we offer a 15 year warranty.

The Sika® Watertight Concrete System provides waterproofing for:

- Basements
- Lift pits
- Retaining walls
- Concrete façades.
- As well as for keeping water in, for example: swimming pools

Sika® Watertight Concrete complies with BS 8102:2009 Type B Construction.

Due to its capillaries and pores, concrete is a naturally-porous material. The Sika® Watertight Concrete System incorporates a range of admixtures (1 on the image below) to improve its resistance to infiltration:

- Sika® WT-100 watertight concrete powder – a combined water-resisting and HRWR/Superplasticiser admixture

- Sika® WT-200 P – a combined crystalline waterproofing concrete and HRWR/Superplasticiser admixture

- Sika® 1+ – a liquid water-resisting waterproofing admixture

The system also creates the optimum water/cement ratio through the use of water reducing admixtures (2 on the image below):

- SikaPlast® / Sika ViscoCrete® – mid and high range water reducing admixtures which decrease the volume of capillary pores and improve rheology and consistency

These active components work throughout the pores and capillaries structure of the concrete to effectively seal the concrete permanently against the penetration of water and other liquids.

The Sika® Watertight Concrete System also includes a range of complimentary jointing products (3-6 on the image below) to effectively seal construction joints and complete watertight structures:

- SikaSwell® – a range of hydrophilic profiles and gun applied sealants, designed for the sealing and waterproofing of construction joints and penetrations (e.g. pipe entries)

- Sikadur® Combiflex SG – high performance, over-banding sealing tape system for postsealing and waterproofing of construction and movement joints

- Sika® Waterbar – internal or external applied waterstops based on PVC, TPO or galvanised steel for construction and movement joints

- SikaFuko® – injection hoses for construction joints that can be used for sealing by injection and re-injection in the event of future movement


For peace of mind and guarantee of a high-quality concrete waterproof solution, the client required a dual system and a single source warranty. Sika provided a financially strong, credible option. The system itself offers strong, reliable results and is incredibly easy to apply. Upon completion, the client was the overall performance.
Michael Maxey
Sika Supply Leicester City Training Complex

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