Using RedGard on cement cracks involves a process similar to its application on other surfaces. Here's a general guide on how to use RedGard to seal cement cracks:
Prepare the Surface: Ensure that the surface is clean, dry, and free from any loose debris, dust, or contaminants. Use a wire brush or similar tool to remove any loose material from the crack.
Prime the Surface (if necessary): Depending on the condition of the surface and the specific instructions provided by the manufacturer, you may need to prime the cement surface before applying RedGard. Follow the primer manufacturer's instructions for application and drying times.
Mix RedGard (if necessary): RedGard is typically ready to use straight from the container. However, if it has separated or settled during storage, you may need to mix it thoroughly before application. Stir the RedGard well until it achieves a uniform consistency.
Apply RedGard to the Crack: Using a brush or a trowel, apply a generous amount of RedGard directly onto the crack. Ensure that the RedGard fills the crack completely and covers it entirely. Extend the application beyond the crack to create a seamless waterproof barrier.
Allow Drying Time: RedGard requires sufficient drying time to form a waterproof membrane. Follow the manufacturer's instructions regarding drying times, which typically range from a few hours to overnight, depending on temperature and humidity conditions.
Apply Additional Coats (if necessary): Depending on the severity of the crack and the desired level of waterproofing, you may need to apply multiple coats of RedGard. Allow each coat to dry completely before applying the next one, and ensure proper coverage over the entire crack area.
Check for Completeness: Once the RedGard has dried completely, inspect the area to ensure that the crack is adequately sealed and that there are no gaps or areas of insufficient coverage.
Finish with Flooring or Additional Coatings: After the RedGard has dried and the crack is sealed, you can proceed with laying flooring or applying additional coatings as needed.
Always follow the specific instructions provided by the manufacturer of the RedGard product you are using, as application methods and drying times may vary depending on the formulation. Additionally, make sure to wear appropriate personal protective equipment and work in a well-ventilated area when applying RedGard or any other construction materials.
Size of Hairline Cracks
Hairline Cracks: RedGard can effectively seal hairline cracks, which are typically very thin cracks measuring up to about 1/16 inch (1.6 mm) in width. The liquid nature of RedGard allows it to penetrate and fill these small cracks, creating a waterproof barrier.
Narrow Cracks: Cracks up to about 1/8 inch (3.2 mm) in width are usually suitable for sealing with RedGard. However, it's important to ensure that the product can adequately fill and cover the crack to create a seamless waterproof membrane.
Wider Cracks: For cracks wider than 1/8 inch (3.2 mm), additional measures may be necessary. While RedGard can still be used to seal wider cracks, it may be less effective on its own. In such cases, it's often recommended to fill larger cracks with a suitable concrete patching compound or hydraulic cement before applying RedGard as a waterproofing membrane over the repaired area.
Structural Cracks: If the crack is indicative of a significant structural issue, it's essential to address the underlying problem before attempting to seal it with RedGard or any other sealant. Structural cracks may require professional assessment and repair to ensure the long-term stability and integrity of the concrete structure.
Before applying RedGard or any other sealant to a crack, it's important to thoroughly clean and prepare the surface to ensure proper adhesion and effectiveness. Additionally, always follow the manufacturer's instructions and recommendations regarding crack size limits and application procedures.