For levelling differences from 1mm to 20mm on internal concrete and timber subfloors, True Level Flexi is a fibre-reinforced, flexible self-levelling compound. It creates a smooth, even surface with high mechanical resistance, designed to support subsequent installations of timber flooring, vinyl, carpet, linoleum, floating floors, or ceramic tiles, and is strong enough to withstand wheelchair traffic and underfloor heating loads.
True Level Flexi combines rapid drying chemistry with fibre reinforcement to provide enhanced flexibility over structural subfloors. It flows easily to self-level and develops a high surface hardness of over 45 N/mm² after 28 days. This mechanical strength prevents the levelling layer from crushing under heavy point loads or rolling traffic, while the built-in flexibility helps the cured compound absorb the differential movement common in timber substrates and heated subfloor installations without cracking or losing bond strength.
True Level Flexi is formulated for interior applications on both porous and non-porous subfloors, including:
Subfloors must be dry, clean, sound, and free of wax, grease, oil, old adhesives, curing compounds, and high moisture levels. All loose material must be vacuumed. Resin, sealers, and wax coatings on timber and Particle Board Flooring must be removed by mechanical means prior to priming.
For substrates with high moisture levels, apply RLA Moisture Seal prior to installing the levelling compound.
Prime all prepared surfaces with RLA Universal Primer according to the substrate type:
Yes, RLA TruLevel Flexi is specifically formulated for timber substrates. Its enhanced flexibility and fibre reinforcement help manage substrate movement, reducing the risk of cracking in the levelling compound and subsequent floor coverings.
Most floor coverings like vinyls, carpets, or ceramic tiles can be installed after 12 hours at 23°C. For timber flooring, allow 24 hours. These rapid cure times support faster project completion.
No, RLA TruLevel Flexi is strictly for internal use only. It should not be applied in areas with rising damp or over expansion joints, as these conditions can lead to product failure and reflective cracking.
All substrates require RLA Universal Primer. Porous surfaces use a 1:2 primer-to-water mix, while timber and non-porous surfaces (like burnished concrete or ceramic tiles) require neat, undiluted primer. Always ensure the primer is dry and tack-free before applying the levelling compound.
| Application | Key benefit | Primary trades |
|---|---|---|
| Levelling timber subfloors | Enhanced flexibility and fibre reinforcement handle timber movement, preventing cracks and floor covering failure. | Flooring installers, Carpenters, Builders |
| Levelling concrete subfloors (internal) | Achieves a smooth, high-strength base from 1-20mm with excellent mechanical resistance, suitable for heavy traffic. | Tilers, Flooring installers, Builders |
| Preparation for various floor coverings | Rapid drying allows vinyl, carpet, and ceramic tile installation after 12 hours, speeding up project timelines. | Flooring installers, Tilers, Renovators |
| Use over underfloor heating systems | Designed to perform over heating systems, tolerating thermal cycling without compromising integrity. | HVAC installers, Builders, Electricians |
Danger: Causes skin irritation. Causes serious eye damage. May cause respiratory irritation. Suspected of causing cancer.
Wear rubber boots, overalls, gloves, chemical goggles, and a respirator. Ensure suitable gloves are used for intermittent contact. Wash hands thoroughly after handling and before eating, drinking, or smoking.
Use only outdoors or in a well-ventilated area. Ensure adequate ventilation to maintain air concentrations below exposure standards. Avoid generating and inhaling dusts.
For poisoning, contact Australia 131 126 or New Zealand 0800 764 766.
Store in a cool, dry, well-ventilated place, out of direct sunlight and away from foodstuffs or incompatible materials. Keep containers tightly closed and store locked up. Dispose of contents/container in accordance with local, regional, national, and international regulations.
Correct subfloor preparation and priming are critical for the long-term performance of RLA TruLevel Flexi and the subsequent floor covering. This guide ensures optimal adhesion and prevents common failures.
Surface prep: Ensure the concrete is dry, sound, and clean, free from contaminants like wax, oil, old adhesive, or curing compounds. Mechanically prepare (shot blast or diamond grind) to achieve a roughened, open-porous surface. Vacuum thoroughly. Minimum subfloor temperature must be 10°C. Do not use solvents or acid etching. Conduct RH and pH readings to relevant Australian Standards. If high moisture is present, apply RLA MOISTURE SEAL first.
Primer: Required. For porous concrete, mix one part RLA Universal Primer with two parts clean water. For burnished or non-porous concrete, apply RLA Universal Primer neat (undiluted). Allow primer to dry completely to a tack-free, transparent film (approx. 2 hours at 23°C).
Surface prep: Timber must be solid, sound, clean, and securely fixed according to manufacturer's instructions and relevant Australian Standards. Re-nail or repair any loose boards. Mechanically remove any wax coatings, sealers, or protective layers that could affect adhesion. Vacuum thoroughly. Ensure adequate subfloor cross-flow ventilation to prevent dampness and check humidity content with a hygrometer.
Primer: Required. Apply RLA Universal Primer in a neat (undiluted) format. Ensure full, even coverage and allow to dry to a tack-free film before applying the levelling compound.
Surface prep: Ensure surfaces are clean, sound, and free from coatings, sealers, or contaminants. Mechanically remove any coatings if present. For extremely non-porous substrates, a light grind or sand is recommended to enhance adhesion. Vacuum thoroughly.
Primer: Required. Apply RLA Universal Primer neat (undiluted) as an even layer. Allow approximately 2 hours at 23°C for the primer to dry to a tack-free, transparent film before application.
| Property | Value |
|---|---|
| Colour | Grey |
| Bulk Density | ~1.00 kg/dm³ |
| Wet Density | ~1.94 kg/dm³ |
| Shelf Life | 12 months |
| Packaging | 20 kg bag |
| VOC GEV Emicode | EC1 Plus |
| Coverage 20kg Bag at 3mm | ~4 m² |
| Mixing Ratio 20kg Bag | 4.6-4.8 litres of water |
| Open Time | 30 minutes |
| Setting Time | 3 hours |
| Application Temperature Range | +5°C to +35°C |
| Maximum Thickness | 20 mm |
| Foot Traffic | 2-3 hours |
| Waiting Time before Vinyl Carpet Bonding | 12 hours |
| Waiting Time before Timber Flooring Bonding | 24 hours |
| pH of Mix | Approximate pH 12 |
| Flexural Strength 1 day | > 2 N/mm² |
| Flexural Strength 3 days | > 3 N/mm² |
| Flexural Strength 7 days | > 5 N/mm² |
| Flexural Strength 28 days | > 7 N/mm² |
| Compressive Strength 1 day | > 8 N/mm² |
| Compressive Strength 3 days | > 11 N/mm² |
| Compressive Strength 7 days | > 15 N/mm² |
| Compressive Strength 28 days | > 20 N/mm² |
| Abrasion Resistance 28 days | ≤ 80 g |
| Surface Hardness 28 days | > 45 N/mm² |
| Classification | CT-C20-F7 (EN 13813) |
Here are some common examples on where RLA True Level Flexi used by our customers.
