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Achieving a perfectly level and mechanically robust internal concrete subfloor, ready for rapid floor covering installation, can be a complex task. RLA TruLevel BulkFill UT provides the confidence of a smooth, high-strength base, handling significant levelling requirements with precision. It ensures your chosen floor finishes, from carpet to tiles, can be laid quickly and perform as intended, without the delays of inconsistent preparation.
RLA TruLevel BulkFill UT is a high-build, rapid-setting, self-levelling cementitious underlay specifically formulated to tackle substantial variations in internal concrete substrates. Developed in Australia at RLA research laboratories, it addresses the need for a robust levelling solution that delivers a smooth, even surface with high mechanical resistance, all while accommodating rapid project timelines. It transforms uneven concrete into an ideal foundation for a variety of floor coverings.
Preparation begins with ensuring the substrate is dry, sound, and clean. Prime all concrete substrates with RLA Universal Primer, adjusting the dilution for porous or non-porous surfaces. For highly absorbent substrates, a second primer coat may be needed to prevent pinholes. Mix one 20 kg bag with 3.6-3.8 litres of clean water for three minutes until lump-free, then apply within 15 minutes. RLA TruLevel BulkFill UT’s excellent flow properties quickly form a smooth, even surface. It can be applied using a gauge rake, stand-up spreader, or trowel, and its pumpable consistency suits large commercial areas. Clean tools immediately with water.
RLA TruLevel BulkFill UT acts as a robust smoothing compound for commercial internal environments, particularly in demanding areas like plant rooms and lift motor rooms. It provides the necessary strength and levelling to prepare these spaces for resilient epoxy floor topcoats and other heavy-duty finishes. Its versatility also extends to preparing internal concrete subfloors for the rapid installation of carpet, carpet tiles, ceramic tiles, and floating floors in general commercial and residential applications, including those with under-floor heating systems.
In complex commercial flooring systems, RLA TruLevel BulkFill UT typically serves as a critical levelling layer after the concrete substrate has been prepared and any damp proofing or priming applied. For instance, in a heavy-duty plant room system, it would follow a waterproofing primer such as Gripset 2P, establishing a smooth, high-strength base before the application of epoxy concrete repair mortars and various epoxy floor topcoats like Megapoxy LVS Sealer. This placement ensures a flat, durable foundation for the subsequent layers, contributing to the overall system's longevity and performance.
RLA TruLevel BulkFill UT distinguishes itself as the high-build solution in the TruLevel family, designed for significant levelling of internal concrete substrates from 3 mm to 70 mm. It delivers excellent flow and high mechanical resistance for quick floor covering installation. For applications requiring thinner, more flexible levelling on timber or other substrates prone to movement, consider RLA True Level Flexi Self-Levelling Compound. When a very fine, smooth finish is paramount for resilient floor coverings like vinyl, or for thinner skim coat applications, RLA TruLevel Fine Finish Self-Levelling Compound is the more appropriate choice, specifically engineered for its ultra-smooth surface characteristics.
No, RLA TruLevel BulkFill UT is not suitable for direct stick timber flooring applications. This limitation is noted to prevent potential issues with bond failure or an unstable subfloor.
RLA TruLevel BulkFill UT can be applied in a single coat from 3mm up to 70mm thick. This high-build capability is designed to efficiently correct significant substrate variations.
Most floor coverings, including carpet, carpet tiles, ceramic tiles, and floating floors, can be installed after 24-36 hours. For vinyl or rubber flooring, a further 2-3mm coat of TruLevel EconoPro or TuffTop, applied over primed TruLevel BulkFill UT, is recommended.
No, RLA TruLevel BulkFill UT is for internal use only. It is not formulated to withstand external weather exposure, which could compromise its performance and durability.
| Application | Key benefit | Primary trades |
|---|---|---|
| Levelling internal concrete (3-70mm) | Corrects significant slab deviations in a single pour, avoiding multiple applications. Provides a robust base with compressive strength exceeding 30 N/mm² at 28 days. | Concreters, Builders, Flooring installers |
| Underlay for carpet, carpet tiles, ceramic tiles | Creates a smooth, even surface (CT-C30-F6 classified) ready for most floor coverings within 24-36 hours, accelerating project timelines. | Tilers, Flooring installers |
| Underlay for floating floor finishes | Achieves the critical flatness required for floating floors, preventing rocking and uneven wear, and is ready for installation within 24-36 hours. | Flooring installers, Builders |
| Encapsulating under-floor heating systems | Provides a solid, level bed over heating systems, ensuring efficient heat transfer and protection, capable of handling thicknesses up to 70mm. | Electricians, Plumbers, Builders |
| Preparing for vinyl or rubber flooring | Forms a strong, deep-fill base layer. Though requiring an intermediate levelling compound, this establishes the necessary bulk level efficiently. | Flooring installers |
Confirm the slab is clean, dry and sound. Use a 10-cent water drop test to determine porosity and set the priming method.
Porous: Universal Primer 1:2 (primer:water). Non-porous: Universal Primer neat to a clear, tack-free film (~2 h at 23 °C).
Per 20 kg, add 3.6–3.8 L clean water; mix ~3 min to a lump-free blend. Do not over-water.
Pour or pump and spread with gauge rake/stand-up spreader or trowel. Apply 3–70 mm in one coat; working time ~30–40 min at 23 °C.
Walk in 3–4 h; install most coverings after 24–36 h at 23 °C. For vinyl/rubber, prime neat then skim 2–3 mm with TruLevel EconoPro or TuffTop.
DANGER
Causes skin irritation. Causes serious eye damage. May cause an allergic skin reaction. May cause cancer. May cause respiratory irritation. Causes damage to organs through prolonged or repeated exposure.
Wear safety glasses with side shields or chemical goggles, suitable protective gloves (polychloroprene, nitrile rubber, or butyl rubber), and protective clothing including overalls and a PVC apron. Use suitable respiratory protection, such as a Type AX-P Filter, to avoid breathing dust.
Use only in well-ventilated areas. Prevent concentration in hollows and sumps.
Store in original, securely sealed containers in a cool, dry area, protected from environmental extremes. Store away from incompatible materials and foodstuff containers. Dispose of contents and container in accordance with local regulations. Do not pour mixed product down drains to avoid blockages.
Proper substrate preparation and priming are critical for ensuring optimal adhesion and long-term performance of RLA TruLevel BulkFill UT.
Surface prep: Substrates must be dry, sound, and clean, free of wax, grease, oil, old adhesive, curing compounds, and any other contaminants. Mechanically prepare the surface using shot blasting or diamond grinding to achieve a roughened, open-porous profile. Vacuum thoroughly to remove all loose material and dust. Do not use solvents or acid etching.
Primer: Required. Prime all concrete with RLA Universal Primer. For porous concrete, dilute primer 1:2 with clean water. For non-porous (e.g., burnished concrete), apply RLA Universal Primer neat. Allow primer to dry completely (approx. 2 hours at 23°C) until it forms a tack-free transparent film.
Surface prep: Ensure tiles are clean, sound, and free from contaminants. Mechanically remove any coatings, curing, or sealing compounds. For extremely non-porous surfaces, a light grind or sand is recommended to enhance adhesion.
Primer: Required. Apply RLA Universal Primer neat (undiluted). Allow primer to dry completely (approx. 2 hours at 23°C) until it forms a tack-free transparent film before application.
Surface prep: The membrane must be clean, fully cured, and free from any contaminants or residues that could impair adhesion. Consult the membrane manufacturer for compatibility if unsure.
Primer: Required. Apply RLA Universal Primer neat (undiluted). Allow primer to dry completely (approx. 2 hours at 23°C) until it forms a tack-free transparent film before application.
| Property | Value |
|---|---|
| Colour | Grey |
| Bulk Density | 1.34 kg/dm³ |
| Wet Density | 2.1 kg/dm³ |
| Packaging | 20 kg bag |
| Mixing Ratio | 3.6-3.8 litres of water per 20 kg bag |
| Open Time | 30-40 minutes |
| Setting Time | 2-3 hours |
| Application Temperature Range | +5°C to +35°C |
| Maximum Thickness | 70 mm |
| Foot Traffic | 3-4 hours |
| Waiting Time Before Subsequent Bonding | 24-36 hours |
| pH of Mix | Approximately 12 |
| Coverage | Approximately 2.4 m² per 20 kg bag at 5 mm thick |
| Classification | CT-C30-F6 (EN 13813) |
| Flexural Strength (28 days) | >6 N/mm² (EN 13892-2) |
| Compressive Strength (28 days) | >30 N/mm² (EN 13892-2) |
| Abrasion Resistance (28 days) | ≤150 g (EN 12808-2) |
| Surface Hardness (28 days) | >50 N/mm² (EN 13892-6) |
| Shelf Life | 12 months |
Here are some common examples on where RLA Aftek TruLevel BulkFill UT used by our customers.
