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Use RLA 2PART for: Waterproofing internal and external wet areas, showers, balconies, planter boxes, retaining walls, ponds, swimming pools, and potable water storage.
RLA 2PART is a two-component, cementitious waterproofing membrane designed for the demanding needs of Australian trades. This Class II membrane combines the robust durability of cement-based systems with the flexibility of pre-mixed alternatives. Its fast-drying formula allows for rapid project completion, while its high tensile strength (1.2 MPa) and elongation (214%) ensure long-lasting, crack-resistant protection. Suitable for both internal and external use, including fully immersed applications like swimming pools and water tanks, RLA 2PART provides a versatile and reliable waterproofing solution. It's certified to AS4858, AS 4654.1, and AS 4020 (potable water), giving you confidence in its performance and compliance.
Key Features of RLA 2PART
- Class II Flexibility: Provides excellent crack-bridging capabilities, accommodating movement in the substrate and preventing water ingress.
- Fast Drying: Recoat in just 2-4 hours and tile or screed within 24 hours, significantly reducing project downtime.
- High Adhesion Strength: Bonds securely to a variety of substrates, including concrete, render, screed, and fibre cement sheeting.
- Durable and UV Stable: Offers long-term protection against water, weathering, and UV exposure, ensuring the integrity of your waterproofing system.
- Immersed Applications: Suitable for use in constantly wet environments like swimming pools, ponds, and water features (must be tiled over).
- Potable Water Approved: Certified to AS 4020, making it safe for use in drinking water storage tanks.
Technical Overview
RLA 2PART is a technically advanced, two-component waterproofing membrane comprising a liquid polymer (Part A) and a cement-based powder (Part B). This combination delivers a superior balance of flexibility and strength. The 1:1 mixing ratio simplifies preparation, and the resulting viscous paste is easy to apply by brush or roller. Achieving the specified dry film thickness (DFT) of 1.2mm is critical for optimal performance, requiring a minimum two-coat application with a total coverage of 1.5 litres/m².
Chemical Properties: Cementitious, providing excellent adhesion and compatibility with cement-based substrates and tile adhesives.
Application Temperature Range: Apply only when the substrate and ambient temperatures are between 5°C and 35°C (41°F and 95°F). Applying outside this range can affect curing time and overall performance. For example, in hot weather, consider working during cooler parts of the day to extend pot life and prevent premature drying.
Application Information
- Required Tools: Mixing drill with paddle attachment, brush or medium nap roller, wet film thickness gauge, scissors or knife (for cutting tape), spatula or roller (for pressing tape).
- Trade-Specific Tips: Always add the powder (Part B) to the liquid (Part A) while mixing. Allow the mixed product to stand for 5 minutes before use to ensure proper hydration. Regularly check the wet film thickness to guarantee adequate coverage.
- Common Issues and Solutions: If the membrane dries too quickly, reduce the application area or work during cooler periods. If pinholes appear, apply an additional thin coat. For substrate irregularities, use RLA repair compounds before applying the membrane.
Storage and Shelf Life
- Storage Requirements: Store in a dry area, off the ground, and out of direct sunlight.
- Shelf Life Information: 12 months from the date of production when stored in unopened original packaging.
- Temperature Considerations: Ensure storage temperature remains above 5°C (41°F).
Certifications
- AS4858: Wet Area Membranes - Ensures compliance with Australian standards for internal wet area waterproofing.
- AS 4654.1: Waterproofing membranes for external above-ground use - Guarantees suitability for external applications.
- AS 4020: Products for use in contact with drinking water - Confirms the membrane is safe for use in potable water storage.
Frequently Asked Questions About RLA 2PART
Q: How do I ensure the correct mixing ratio for RLA 2PART?
A: RLA 2PART has a simple 1:1 mixing ratio. Always add the powder (Part B) to the liquid (Part A). For a full kit, pour half the liquid (10 litres) into the 20L bucket, then slowly add one 10kg bag of powder while mixing with an electric drill and paddle. Smaller quantities can be mixed using the same 1:1 ratio.
Q: What is the coverage rate of RLA 2PART?
A: A 40kg kit of RLA 2PART covers approximately 23m² (247.57 sq ft). However, this is dependent on the surface profile. Uneven or porous surfaces may require more product to achieve the required 1.2mm dry film thickness. Always apply a minimum of two coats.
Q: Can RLA 2PART be used on damp substrates?
A: Yes, but you must first prime the surface with RLA MOISTURE SEAL if the substrate has residual moisture greater than 80% RH (ASTM F2170) or 5% moisture content (ASTM F2659). For standard porous surfaces, use RLA POROUS PRIMER. For non-porous surfaces, use RLA NON POROUS PRIMER.
Q: How do I use RLA 2PART in a swimming pool?
A: RLA 2PART is suitable for immersed applications like swimming pools. However, it *must* be tiled over. It cannot be used as an exposed finish in these environments. Ensure you follow the correct application procedures, including priming and achieving the required dry film thickness. Use polymer-modified tile adhesives and grouts from the RLA range for tiling.
Q: What are the safety precautions when using RLA 2PART?
A: Always refer to the Safety Data Sheet (SDS) for comprehensive safety information. As a cementitious product, it's essential to wear appropriate personal protective equipment (PPE), including gloves and eye protection. Ensure adequate ventilation during application. Clean tools and spills with water while the product is still wet.
Use RLA 2 PART Two Component Cementitious Membrane for:
- Internal wet areas: Waterproofing showers, laundries, and bathrooms before tiling.
- External wet areas: Providing a flexible and UV-stable waterproof layer on balconies and decks before tiling or other toppings.
- Planter boxes: Creating a waterproof barrier to protect structures from water damage caused by soil and moisture.
- Retaining walls: Waterproofing subterranean walls to prevent water ingress from the surrounding soil.
- Ponds and water features: Providing a reliable waterproof lining for decorative water features.
- Swimming pools: Creating a waterproof membrane beneath the tile finish in swimming pools and spas.
- Potable water storage facilities & retention tanks: Ensuring a safe and certified waterproof lining for drinking water containment.
- Façade walls under tiles and stone: Protecting building facades from water penetration behind adhered finishes.
Why Use RLA 2 PART Two Component Cementitious Membrane:
- Versatile Application: Suitable for a wide range of waterproofing needs, from internal bathrooms to external balconies and even immersed environments, simplifying product selection for various projects.
- Long-Lasting Protection: Forms a tough and durable waterproof barrier with high adhesion, ensuring reliable performance and preventing costly water damage over time.
- Easy to Apply: The two-component system mixes readily, and the application process with a brush or roller is straightforward for trade professionals familiar with membrane application.
- Meets Australian Standards: Independently tested and certified to AS4858 and AS 4654.1, providing confidence in its performance and compliance with local building codes.
- Safe for Potable Water: Approved to AS 4020, making it suitable for use in contact with drinking water, an essential requirement for specific applications.
- Saves Time: Fast drying properties allow for quicker project completion, enabling tradespeople to move on to subsequent stages of the job more efficiently.
- Flexible Performance: The flexible nature of the membrane accommodates minor substrate movement, reducing the risk of cracking and maintaining the integrity of the waterproof seal.
How to apply RLA 2 PART Two Component Cementitious Membrane:
- Surface Preparation: Ensure all surfaces are clean, sound, smooth, dry, and free from contaminants. Mechanically remove any unsound layers or contaminants. Fill any defects, voids, or cracks.
- Priming: Apply the appropriate RLA primer based on the substrate's porosity: RLA Porous Primer for porous surfaces (1-2 coats), RLA Non Porous Primer for non-porous surfaces (1 coat), or RLA Moisture Seal for damp surfaces (1-2 coats). Allow primer to dry completely.
- Mixing: Pour half (10 litres) of Part A liquid into a clean 20L bucket. While mechanically stirring, slowly add one 10 kg bag of Part B powder and mix until smooth and lump-free. Allow to stand for 5 minutes and remix before use.
- First Coat Application: Using a brush or medium nap roller, apply an even first coat to the surface, achieving a minimum wet film thickness of 0.75mm (750 micron).
- Drying Time: Allow the first coat to dry completely, typically for 2-4 hours at 23°C and 50% RH. Drying times will vary with temperature and humidity.
- Second Coat Application: Apply a second coat at a right angle to the first coat, again achieving a minimum wet film thickness of 0.75mm (750 micron). This will result in a total minimum dry film thickness of 1.2mm.
- Detailing: Incorporate bond breaker tapes (e.g., Elastoproof Joint Band, BRW PF Tape) at all joints, junctions, and corners as per relevant Australian Standards (AS 3740 & AS 4654.1). Use Elastoproof Collars or BRW PF Tape for pipes and penetrations.
- Curing: Allow the membrane to cure fully before tiling or applying toppings. Polymer-modified adhesives can typically be used after 24 hours. Immersion in water should be delayed for 7 days.
RLA 2 PART Two Component Cementitious Membrane limitations:
- Do not apply when surface or ambient temperatures are below 5°C or above 35°C.
- Must not be applied when raining or if rain is imminent.
- Not to be used as a trafficable membrane finish.
- Not to be used as an exposed coating in swimming pools or spas - must be tiled over.
- Not to be used in areas subject to negative hydrostatic pressure.
Safety precautions when using RLA 2 PART Two Component Cementitious Membrane:
- Personal Protective Equipment: Wear appropriate gloves (e.g., nitrile or rubber), eye protection (e.g., safety glasses), and respiratory protection (e.g., dust mask) to avoid contact with skin, eyes, and inhalation of dust.
- Ventilation: Ensure adequate ventilation in the work area, especially in enclosed spaces, to minimise dust inhalation.
- Handling: Avoid generating dust during mixing and handling. Wash hands thoroughly after use. Refer to the Safety Data Sheet (SDS) for detailed handling and disposal instructions.
RLA 2 PART Two Component Cementitious Membrane can be used on the following substrates:
- Concrete: Ensure concrete is cured for at least 28 days and is clean and dry. Prime with RLA Porous Primer.
- Render: Cement render should be allowed to cure for at least 7 days. Ensure it is sound and prime with RLA Porous Primer.
- Screed: Sand cement screeds require a minimum 7-day cure. Prime with RLA Porous Primer.
- Masonry: Ensure surfaces are pointed flush and free of defects. Prime with RLA Porous Primer.
- Compressed fibre cement sheeting: Ensure sheets are installed according to manufacturer's recommendations and prime with RLA Porous Primer.
- Plasterboard: Use only water-resistant plasterboard in wet areas and prime with RLA Porous Primer.
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