Who we are

Anchored in Switzerland and internationally active, WALO is managed as a family business in the 4th and 5th generation. For over 100 years, WALO has focused on the combination of consistency and innovation.


What we do

WALO is active as an innovative total solutions company in all markets of the construction industry. The family-owned company has established itself as a reliable partner in the construction industry and infrastructure projects in Switzerland and worldwide with its decades of experience and the permanent development of sustainable as well as economical solutions.



We have successfully implemented many challenging projects. Therefore, we proudly let our references speak for our work.



Whether residential, industrial, healthcare, outdoor or for sports and leisure facilities - seamless floor coverings have to meet a wide variety of requirements on a permanent basis.



Good buildings and thus satisfied customers require precise construction work. All our employees, from unskilled workers to engineers, play a key role in ensuring that we achieve this goal time and time again.


Avce Reservoir, Slovenia

Learn about how WALO used innovative techniques to construct an impermeable lining system for the Avce pump storage scheme, located in Slovenia's karst formations. The project was completed in just four months, and included the installation of an asphalt laboratory to ensure rigorous quality control.

Case Study Description

The Avce pump storage scheme has a turbine capacity of 185MW. The lower reservoir is formed by the river Soca, with an associated upper reservoir 520m higher, sited in a natural depression. The ground under the reservoir is calcareous, formed of karst formations, so the reservoir had to have an impermeable lining system.


After the initial earthworks and concrete structures were constructed, WALO started the lining works. The works consisted of an Asphaltic Binder Layer (ABL) and bituminous Dense Asphaltic Concrete (DAC) layer, the first project of its kind in Slovenia. Like every  WALO project, the team applied DAC formulated to a unique design mix using specialized laying and compaction techniques.


To comply with the rigorous required Quality Assurance regime, WALO installed its own asphalt laboratory at the mixing plant to control the quality of the asphalt. During the lining works, the WALO team alternated the placing of the different materials throughout the project, dependent upon the prevailing weather conditions. This degree of flexibility enabled the optimization of the scheduling of the works. All works – including joint construction, ramps and access roads and mastic coating, a total area of 140,000m2 – were completed after only four months.


Walo Bertschinger AG
Giessenstrasse 5
8953 Dietikon 1


Asphalt Hydraulic Engineering

Building time
May - September 2008
Share page

Contact us

We appreciate your interest in the WALO Group and will be happy to answer any questions you may have.

© 2024 Walo Bertschinger. All rights reserved.