Mastic asphalt, when used on underground structures, provides a continuous waterproofing lining or ‘tanking’ to walls, floors and foundations, constructed in direct contact with the earth. In addition mastic asphalt is used for lining structures in water and sewage treatment works, and it can also be successfully used as part of a gas protection system.
When fully confined, mastic asphalt will provide an effective, seamless barrier to the transmission of water from the ground for the design life of the structure in which it is incorporated. Acid resisting mastic asphalt tanking can also be used to line bund walls and emergency catchment areas where corrosive liquids are involved.

30mm Three-Coat Mastic Asphalt was used to Protect Bristol's Council Office Moat