​MasterSeal 345 – Waterproofing membrane


How MasterSeal 345 waterproofing membrane works?

MasterSeal 345 membrane is a sprayable membrane for waterproofing concrete structures and water management. It can be 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, even on the damp section of the 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

MasterSeal 345 CSL application

Illustration: Example of MasterSeal 345 double-bonded sprayed membrane application in composite shell lining tunnel


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?

  • Speed and ease of application

  • Fast curing prevents disruption of construction operations

  • Two-sided bond with sprayed-concrete allows for composite behavior

  • Double bonded composite shell lining allows no water ingress


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