TREMproof® 250GC is a single-component, rapid-curing, fluid-applied elastomeric waterproofing membrane designed for use on a variety of substrates, including green and damp concrete. As a one-part moisture-curing polyurethane product, it is available in three distinct viscosities—self-leveling (SL), roller (R), and trowel (intended for detailing work only). It is used in applications such as backfilled walls, split slabs, planters, and submerged conditions. The product complies with VOC regulations and is suitable for use in high-moisture environments.
This article provides a detailed guide for the installation and application of TREMproof 250GC. It is based on manufacturer specifications, product descriptions, and technical data provided by TREMCO. The goal is to equip users with the knowledge necessary to apply the product correctly and effectively, ensuring long-term waterproofing performance and structural integrity.
Understanding TREMproof 250GC
TREMproof 250GC is a high-solids, VOC-compliant modified polyurethane waterproofing membrane that cures rapidly when exposed to moisture. It is a one-part system that eliminates the need for mixing, making it easier to handle and apply. The product is designed for use on a variety of substrates, including concrete, concrete masonry units (CMUs), and plywood. Its ability to cure on damp and green concrete makes it suitable for projects where time is a critical factor, such as in split-slab applications or areas with high humidity.
The membrane is available in three viscosities:
- Self-Leveling (SL): Ideal for smooth, even application over large, flat surfaces.
- Roller (R): Suitable for general application and can be applied with a roller.
- Trowel: Intended for detailing and small area work, such as joints or seams.
Each viscosity serves a specific purpose and application type, allowing users to select the most appropriate option based on the project requirements.
Surface Preparation and Application Conditions
Proper surface preparation is essential to ensure the effectiveness of TREMproof 250GC. The substrate should be clean, free of dust, oil, and other contaminants that may interfere with adhesion. In some cases, it may be necessary to prime the surface to enhance bonding, though the product is designed to adhere directly to damp and green concrete.
The product can be applied to surfaces that are still in the curing phase, which is a significant advantage in construction projects where time is a constraint. However, it is important to follow the manufacturer's guidelines regarding the moisture content of the concrete. The product should not be applied to surfaces that are excessively wet or saturated, as this may affect the curing process and adhesion.
Temperature and environmental conditions also play a role in the application process. TREMproof 250GC should be stored at a temperature above 40°F. It is recommended to store and apply the product in a temperature range that ensures optimal curing and performance.
Application Techniques and Tools
TREMproof 250GC can be applied using a variety of methods, including rolling, troweling, and self-leveling. The choice of method depends on the viscosity of the product and the nature of the application area.
Roller Application: For roller-grade material, a high-quality paint roller or similar applicator is used. The product is applied in a uniform layer, ensuring full coverage without leaving gaps or thin spots. The thickness of the application can vary based on the project requirements, with recommended coverage rates provided by the manufacturer.
Trowel Application: Trowel-grade material is used for detailed work such as joints, seams, and other areas where a thicker application is required. The product is applied with a trowel, allowing for precise control over the thickness and coverage.
Self-Leveling Application: For large, flat surfaces, self-leveling material is applied and allowed to spread evenly. This method ensures a smooth, uniform layer with minimal effort.
Regardless of the method used, it is important to maintain a consistent application thickness to ensure uniform protection. The product can be applied in a single lift up to 120 mils, or in multiple layers to achieve a high-build system of up to 215 mils for submerged conditions or high-risk areas.
Curing and Drying Time
TREMproof 250GC is a rapid-curing product, with a cure time of approximately 24 hours. This allows for quick progress in construction projects, reducing downtime and delays. The product's ability to cure rapidly is attributed to its moisture-curing nature, which accelerates the chemical reaction and solidifies the membrane.
The curing time may vary slightly depending on environmental conditions such as temperature, humidity, and ventilation. It is recommended to allow the product to cure fully before exposing it to water or other elements. Once cured, the membrane forms a durable, flexible layer that can withstand movement, expansion, and contraction of the underlying structure.
Coverage Rates and Application Thickness
The coverage rate of TREMproof 250GC depends on the application thickness and the viscosity of the product. The manufacturer provides the following coverage rates in wet mils:
- 60 mils: Approximately 25 ft²/gal (0.61 m²/L)
- 90 mils: Approximately 18 ft²/gal (0.44 m²/L)
- 120 mils: Approximately 13 ft²/gal (0.32 m²/L)
- 215 mils: Approximately 7.5 ft²/gal (0.19 m²/L)
These rates help users estimate the amount of product needed for a given area and thickness. It is important to note that the product can be applied in a single lift or in multiple layers to achieve the desired thickness.
Safety and Compliance
TREMproof 250GC complies with VOC regulations, making it an environmentally friendly option for waterproofing applications. However, users should be aware of the potential health hazards associated with the product. The material may contain chemicals that are known to the State of California to cause cancer and reproductive harm. Therefore, it is recommended to follow all safety guidelines provided by the manufacturer and to use appropriate personal protective equipment (PPE) during application.
Users should also consult the Safety Data Sheet (SDS) for additional information on handling, storage, and disposal of the product. The SDS provides detailed information on the chemical composition, first aid measures, and emergency response procedures.
Compatibility with Other Systems
TREMproof 250GC is compatible with a wide range of substrates and can be used in conjunction with other waterproofing systems. It is particularly suitable for use with vegetated roofing systems and can be applied on concrete masonry units and plywood. The product is also compatible with Tremco's roofing systems, allowing for a seamless integration into existing construction projects.
For best results, it is recommended to use TREMproof 250GC in combination with other complementary waterproofing products from the same manufacturer. This ensures a cohesive and effective waterproofing solution that meets the specific needs of the project.
Conclusion
TREMproof 250GC is a versatile and effective waterproofing membrane that offers rapid curing, high solids content, and compatibility with a variety of substrates. Its ability to be applied on damp and green concrete makes it a valuable solution for construction projects where time is a critical factor. The product is available in three viscosities—self-leveling, roller, and trowel—each designed for specific application types.
Proper surface preparation, application techniques, and environmental conditions are essential to achieving optimal results. The product's rapid curing time and high coverage rates contribute to its efficiency and ease of use, making it a preferred choice for waterproofing applications in a variety of settings.
Users should always follow the manufacturer's guidelines for application, safety, and storage to ensure the best performance and longevity of the product. When used correctly, TREMproof 250GC provides durable, long-lasting protection against water infiltration, ensuring the structural integrity and longevity of the underlying surfaces.