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    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 uses:

    • 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 solutions with other waterproofing methods

    What are the unique features of MasterSeal 345?

    • Dry-process material, ready-for-use
    • Elasticity 80-140% (depending on the temperature)
    • Fast curing
    • No toxic components
    • Environmentally preferable

    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

    US / Canada Product Information

    Data Sheet

    Direct contact

    Master Builders Solutions Technical Support

    Construction Systems


    Safety Data Sheet (SDS)

    Find all available safety data sheets for this product.

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    LEED v4 & v4.1 Teaser Image

    LEED v4 & v4.1

    Search by product or CSI code and download up to date LEED information.

    Related Literature

    MasterSeal 345 Data Sheet

    pdf (214.93 Kb)

    MasterSeal 345 Data Sheet (French)

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    MasterSeal 345 SDS

    pdf (318.34 Kb)

    MasterSeal 345 SDS

    pdf (235.17 Kb)

    MasterSeal 345 SDS

    pdf (175.41 Kb)

    MasterSeal 345 SDS

    pdf (312.10 Kb)