TREMproof® 250GC

Single-Component, Rapid Curing, Fluid-Applied Elastomeric Waterproofing Membrane

TREMproof® 250GC is a rapid-curing, high-solids, VOC-compliant modified polyurethane waterproofing membrane that can be applied to damp and green concrete. TREMproof 250GC is a one-part moisture-curing elastomer available in three viscosities: Self-Leveling (SL), Roller (R) and Trowel (trowel intended for detailing work only).

Basic Uses
  • TREMproof 250GC is designed for use on backfilled walls, split slab applications, planters and submerged conditions.

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Product Details, Safety, and Installation
  • What applications are TREMproof 250GC suitable for?

    TREMproof 250GC is suitable for backfilled walls, between slab and planter applications. TREMproof 250GC may also be used in non-potable water storage tanks.

  • What viscosity grades are TREMproof 250GC available in?

    S/L = Self-Leveling, R = Roller Grade, and T = Trowel Grade.

  • Can TREMproof 250GC be applied in cold weather below 40°F (5°C)?

    TREMproof 250GC may be applied at temperatures below 40°F (5°), however, all substrates must be clean, dry and frost-free.  It is Tremco’s best recommendation to apply products when substrate and ambient temperatures are at 40°F (5°) and rising. Please note the following when applying these products at temperatures below 40°F (5°).

    Special Note: TREMproof 250GC can freeze while in the pail but it will make it very difficult to apply to the substrate and will significantly increase cure times.

  • Do TREMproof 250GC require a protection course?

    TREMproof 250GC requires a protection course.  A TREMDrain drainage course may be an acceptable substitute or used as an add-on. 

  • What is the advantage of combining a drainage mat with a below-grade waterproofing membrane?

    Use of a drainage mat reduces hydrostatic head pressure, affords protection to the membrane and better directs water to the perforated foundation drainage system. Combining a drainage mat with a Tremco below-grade waterproofing membrane typically qualifies for extended warranties. 

  • What ASTM specification does TREMproof 250GC meet?

    TREMproof 250GC meets or exceeds all minimum performance requirements of ASTM C 836.

  • How long does the concrete have to be cured before TREMproof 250GC can be applied?

    TREMproof 250GC only requires 24 hours following the removal of concrete form work.

  • What is the typical minimum dry mil thickness requirement for TREMproof 250GC?

    60 mils.

  • Can TREMproof 250GC be sprayed?

    Spraying of TREMproof 250GC is not recommended.  If a sprayable membrane is preferred or required, TREMproof 260 may be a suitable alternative. Please consult with Technical Service.

Projects using TREMproof 250GC

Harrisburg, Pennsylvania

Pennsylvania Capitol East Wing

After continual exposure to the elements over the years, the sheet-applied waterproofing system below the paver and pedestal system had begun to fail at its numerous seams and moisture had begun infiltrating the occupied spaces.

Brantford, ON

City of Brantford

A new water pumping station and holding reservoir needed to be up and running quickly to service an industrial park area that was experiencing tremendous growth.