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TremProof 250GC  :

Key Benefits Summary

For use on Green concrete

Rapid curing

High solids

VOC compliant

One part

Suitable for applications to horizontal & vertical surfaces

Meets or exceeds ASTM C836 Standard Specification for High Solids Content, Cold Liquid-Applied Elastomeric Waterproofing Membrane for Use with Seperate Wearing Course


Product Information



TREMproof 250 GC is a rapid curing, high solids, VOC compliant, modified polyurethane waterproofing membrane that can be applied to Green concrete. TREMproof 250 GC is a one-part moisture curing elastomer that is suitable for applications to horizontal and vertical surfaces.



TREMproof 250 GC can be applied to Green concrete and is commonly used as a between slab on:

Plaza Decks

Parking Decks

Roof Terraces - Ballasted


TREMproof 250 GC is also used for waterproofing:

Foundation walls

Planter boxes - Anti Root Additive Available


TREMproof 250 GC is an effective membrane for use on:



Prepared masonry surfaces



TREMproof 250 GC is not recommended for:

Contaminated or wet surfaces (free water)

Applications where the applied membrane will not be covered over and where the membrane will be subject to traffic

Contact with asphaltic products

Concrete forms must be removed for a minimum of 24 hours before TREMproof 250 GC can be applied.



18.9l Pail



available in black only


Product Code



Technical Information


TREMproof 250 GC is an elastomeric modified polyurethane.


Performance (Typical Properties)

Solids Content (ASTM C 1250)             90%

Low Temperature Flexibility & Crack Bridging (ASTM C 1305)          Pass

Adhesion-in-peel after water immersion (unprimed) (ASTM C 794) 22N

Extensibility After Heat (ASTM C 1522)         Pass

NOTE: Typical Properties should not be used as Specifications.


Usage Guidelines


Substrate Preparation

Surfaces to be waterproofed must be clean and dry. Concrete slabs should have light steel trowel finish followed by a fine hair broom or equivalent finish and should be water cured. Consult architect or engineer for minimum cure time on concrete before water cure can be stopped and floor traffic is permitted. Allow a minimum of 24 hours for concrete surface to dry after stopping water cure on decks or removing forms on walls. If release agents are present, they must be removed before the application of TREMproof 250 GC. Following good drainage practice, the structural slab should be sloped to drain a minimum of 3mm per 30cm. All shrinkage cracks should be treated with a 1.5mm coating of TREMproof 250 GC, 15cm wide centered over the crack. Moving structural cracks greater than 1.6mm can be routed out and primed with Vulkem 171 Primer then caulked. At expansion joints and other areas of potential high movement, Tremco elastomeric sheeting embedded into the membrane may be required. Consult your local Tremco representative or distributor for specific design details. All detailing must be cured a minimum of 12 hours prior to the application of the membrane. Detailing should be wiped clean with Xylol prior to the application of the membrane.


Method of Application

TREMproof 250 GC shall be spray, roller, squeegee or trowel applied at the rate of 1.63 litres per square metre to provide a DFT of 1.5mm. A Flood Test should be run; the membrane should be cured to a firm rubber set (36 hour minimum) before flooding. Flood with a minimum of 2.5cm of water for 24hours. Allow TREMproof 250 GC to completely cure before a protection course of TREMboard and/or an approved drainage mat can be applied.



Store in an upright position in original packaging. Keep dry and store within +5 C and +35 C ambient temperature.


Shelf Life

12 months when stored as recommended in original unopened packaging.


Health and safety precautions

The Material Safety Data Sheet (MSDS) must be read and understood prior to use


Waterproofing FAQ

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