The Sika®-1 Pre-Bagged Structural Waterproofing System has been used to control water ingress on new build, and repair and refurbishment projects worldwide.

Originally invented by Kaspar Winkler, the founder of Sika in 1910, Sika®-1 was a quick setting waterproofing admixture for mortar, which was used to waterproof the Gotthard Tunnel, enabling the Swiss railway company to electrify this important connection between Northern and Southern Europe.

A new, upgraded Sika®-1 Pre-Bagged Waterproofing System for superior performance and easier application is now available. The 4 Sika® -1 Pre-Bagged Mortars, consisting of a blend of special cement and kiln dried graded aggregates, are ready-made with Sika®-1 waterproofing admixtures included as a powder, removing the need for a separate liquid waterproofer – just add water. Packaged in 4 grades, each mortar is specifically designed for optimum application performance and durability.

The Sika®-1 Pre-bagged waterproofing system consists of a render system for use on walls and overhead surfaces, and a screed system for use on the floor.

The system is BBA Certified.

No ongoing maintenance

Once applied there is no requirement for drainage products or equipment such as water pumps.

Other benefits

  • Withstand high water pressures
  • Bonds to the substrate
  • Hard-wearing surface
  • Follow contours of structures
  • 100-year track record
  • Can be used to achieve Grades 1-3 according BS 8102-2022
  • Suitable for high water table according to BS 8102-2022
  • Drinking water inspectorate approved ref no. 56.4.94
  • Sika offers a guarantee when the product is installed by a registered contractor.

Sika®-1 Render 3-Coat System


Sika®-1 Pre-Bagged Spritz & Bonding Coat Mortar


Sika®-1 Pre-Bagged Render Mortar


Sika®-1 Pre-Bagged Finishing Mortar

Sika®-1 Screed 3-Coat System


Sika®-1 Pre-Bagged Spritz & Bonding Coat Mortar


Sika®-1 Pre-Bagged Screed Mortar

Complementary products

Sikadur® Combiflex® SG System


Sika® Damp-proofing Slurry

SikaMur® InjectoCream-100

SikaTop® Seal-107 Standard