WALO has played a pioneering role in the field of bituminous asphalt seals for over 75 years with its various services in Switzerland and worldwide. Apart from sealing reservoirs, canals and landfills, dams are also part of our specialist department’s range of services.
Dams can be made impermeable to water by both a sealing layer on the inside of the dam wall (core wall) as well as an external sealing layer on the dam embankment. In the latter case, the asphalt liner is applied to the embankment facing the water of the finished dam in strips between 2.5 and 6 metres wide. Embankments up to 200 metres long and with a maximum slope of up to 1:1.5 are possible here The high resistance of the asphalt to mechanical influences (e.g. ice drift) means that no additional measures are needed to protect the sealing layer. The asphalt liner is environmentally friendly and non-toxic, making it also ideal for dams containing drinking water.