As early as 1920, when the electrification of the railways began, the importance of tunnel waterproofing was recognized.  Nowadays, the waterproofing of underground traffic structures is required as a matter of course by specialists. With its waterproofing admixture Sika^® -1, Sika pioneered underground watertight concrete and continues to remain influential in the development of new technologies.

Sika’s commitment to tunnelling can be seen through our work on some of the largest tunnel projects in the world e.g. The Gotthard tunnel, Switzerland

Sika (NZ) Ltd offers complete solutions for tunnelling in New Zealand from Concrete Admixtures through to Waterproofing and Internal Protective Coatings.