Dual seal is a high performance self-swelling, self-healing waterproofing membrane comprising of a thick, tough, high density polyethylene sheet laminated to 4Kg/m2 of quality Bentonite granules. The Bentonite used in the manufacture of Dual Seal is capable of repeated cycles of wetting and drying without deterioration of its sealing properties and has a life expectancy measured in thousands of years (BBA Certified). It has WRAS approval for use with potable water.
Dual Seal has been specifically developed for use as a high-performance waterproofing membrane to provide a totally watertight barrier in below ground concrete construction, including basements, underground car parks, plant rooms, access tunnels etc. Dual Seal Membrane can be installed in damp conditions and is, therefore, particularly suitable as a roof waterproofing system for each covered potable water reservoir.