​MasterSeal 345 – Waterproofing membrane


How does MasterSeal 345 work?

MasterSeal 345 membrane is a sprayable membrane for waterproofing concrete structures and water management. MasterSeal 345 membrane is spray-applied between layers of sprayed or cast-in-place concrete or as a stand-alone membrane. MasterSeal 345 membrane exhibits high bond strength to the substrates on both sides of the membrane with good elasticity. ​MasterSeal 345 membrane can be directly applied to damp sections of substrate.

Recommended for use in:

  • Cast-in-place or precast
  • Composite-designed sandwich structures (concrete/membrane/ concrete)
  • Underground structures with complex profiles and geometry
  • Bonds to steel and most sheet membranes and enables interface sol​utions with other waterproofing methods

What are the unique features of MasterSeal 345?

  • Dry-process material, ready-for-use
  • Elasticity 80-140% between -4 and 68 ºF (-20 and 20 ºC)
  • Fast curing – in 4 to 6 hours (depending on environmental conditions)
  • No toxic components
  • Environmentally preferable – non-toxic

What are the benefits of MasterSeal 345?

  • Easily applied by spraying with standard equipment
  • Two-sided bond with sprayed-concrete allows for composite behavior
  • Fast curing prevents disruption of construction operations
  • The fully bonded system provides excellent water tightness, preventing development of water migration in both concrete membrane interfaces

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