MASTERSEAL 345 

MASTERSEAL 345 is an EVA polymer based, sprayable membrane for the waterproofing of concrete structures.  MASTERSEAL 345 is spray applied in a sandwich construction between layers of sprayed or cast concrete.  It has good bond strength characteristics to the substrates on both sides of the membrane and behaves elastically.

As a fully bonded system, this promotes excellent watertightness characteristics to the underground structure, preventing the development of water migration on both concrete-membrane interfaces.

As with all spray applied products, it is not possible to seal against active water ingress through the substrate.  In such cases the MASTERSEAL DR1 drainage system is recommended to be used in combination with MASTERSEAL 345.  Please refer to MASTERSEAL DR1 technical data sheet for details.  However, MASTERSEAL 345 can be applied to damp and wet (no running water) substrate.

Steel fibre reinforced sprayed concrete can be used on both sides of the MASTERSEAL 345 membrane.

MASTERSEAL 345 is recommended for:

• sprayed concrete structures
• replacement of waterproofing sheet membranes
• in sandwich structures (concrete / membrane / concrete)
• composite single shell permanent tunnel linings on sprayed concrete
• underground structures with complex profiles and geometry
• bonds to steel and most sheet membranes and enabling interface solutions with other waterproofing methods