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Walo UK Limited are specialists in the field of Hydraulic Asphalt Engineering supplying Impermeable Lining Systems for the permanent sealing of Landfill Sites, Dams, Reservoirs, Canals, Sea Defences and Contaminated Land. Our Dense Asphaltic Concrete (DAC)lining system is a 'specifically designed stand-alone impermeable lining' for the bottom and side slope sealing of containment sites, designed to greatly improve on the basic 'EU Landfill Directive' conditions for permanently preventing pollution to soil and groundwater. DAC is flexible and extremely strong, manufactured locally and engineered on site under specific CQA procedures. The DAC barrier is generally engineered to a thickness of 14cm and to a coefficient of permeability better than 1 x 10-13 m/s (metres per second). The DAC lining system contains no mobile toxic compounds and is unaffected by all natural weather conditions. DAC is so strong it can be trafficked by rubber tyred vehicles without fear of damage. It can be laid on slopes up to 1:1.5 (34 degrees). The DAC impermeable lining system is resistant to any form of chemical attack and is unaffected by temperatures of 6


Mr David Wilson
16 Parker Court

Dyson Way ,Stafford

The Cottonmount Landfill Site is located Co.Antrim, Northern Ireland.

The site is located within Cottonmount Quarry a working hard rock quarry. The landfill site receives general municipal waste from Belfast City.

WALO UK was appointed as the principal lining contractor for the site and constructed 3 landfill cells, using dense asphaltic concrete, between 2006 and 2008.

In 2008 a cell was constructed using dense asphaltic concrete as part of a composite lining system of some 17,800 m2. The lining system comprised of a 300 mm mineral attenuation layer; 200 mm sub-base material layer; 60 mm asphaltic binder layer; 80 mm dense asphaltic concrete layer and a mastic seal coat to the base, side slopes and bund areas.

The works involved the placing of asphalt by paver and winch on a 40m slope. Once the lining was completed a 300 mm thick layer of leachate drainage stone was applied to the whole area. The works were undertaken in the winter of 2008 in very difficult weather conditions.

For further information please email WALO UK LIMITED

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