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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.

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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.

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Projects

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

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Products

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.

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Career

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.

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Locations

With our locations in three countries, we are successfully active for you worldwide.

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Lostallo Landfill, Switzerland

WALO was selected to provide a lining system at the Lostallo landfill site for Cell 5, a cell of approximately 10,000m2, which presented the main challenge of working on extremely steep slopes.

Case Study Description

The Lostallo landﬁll site, covering an area of around 30,000m2, is located in Lostallo, a village in the district of Moesa in the Swiss canton of Graubünden, in the Italian area of Switzerland. WALO was selected to provide a lining system at the landfill site for Cell 5, a cell of approximately 10,000m2.

The main challenge presented by this project was the extreme incline of the sides of the landﬁll cell. At 1:1.5, the slopes are extremely steep, which was where WALO’s particular expertise came into play as the company specializes in working on very steep slopes with specially designed machinery and highly skilled operators. In addition, environmental issues are of paramount importance in Switzerland so environmental protection of the site was absolutely crucial.

Groundwater is always vulnerable to contamination from leachate and methane, found in most solid waste landfill deposits. WALO’s Dense Asphaltic Concrete (DAC), formulated in the company’s laboratory to a design mix unique to the project, is a highly robust barrier lining system, impermeable to both of these contaminants and so was the ideal choice at Lostallo. The cell base and slopes were leveled by an excavator and a foundation layer was then placed by bulldozer, secured for working on the extreme slope by one of WALO’s 60 ton winches. Next to the clay liner (k>5×10-8 m/s), some 7-800 mm thick asphalt was placed in two layers by WALO’s asphalt paver and main winch. The two bituminous layers – the Asphaltic Binder Layer and the Dense Asphaltic Concrete layer – were also installed by the main winch and paver and compacted by rollers on winches.