RLA Aftek TruLevel BulkFill UT

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.

Why this product exists

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.

The numbers that matter

• 3 mm to 70 mm thickness in a single application: This allows RLA TruLevel BulkFill UT to handle significant levelling requirements, providing a versatile solution for heavily undulating subfloors, not just minor skimming.
• Foot traffic in 3–4 hours, ready for floor coverings in 24–36 hours: Rapid hardening minimises downtime, allowing other trades to access the area quickly and accelerating project completion.
• Compressive strength >30 N/mm² and Flexural strength >6 N/mm² (28 days): This professional-grade performance, classified as CT-C30-F6 according to EN 13813, ensures a durable, mechanically resistant surface that withstands heavy point loads and general traffic without compromising the integrity of the floor covering.

What it's like to use

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.

Where this product excels

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.

How it fits in a real system

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.

Choose this when

• When significant levelling is required: Use for internal concrete substrates needing 3 mm to 70 mm of build in a single application.
• For rapid project completion: When floor coverings need to be installed quickly, with readiness in 24-36 hours.
• When high mechanical resistance is critical: For commercial and industrial internal floors requiring a durable, load-bearing underlay.
• As a smoothing compound for plant rooms and lift motor rooms: When preparing these specific commercial internal areas for robust floor finishes.

Don't use this when

• Not for: Direct stick timber flooring applications.
• Not for: External use, or on substrates exposed to rising dampness or excessive moisture without prior RLA MOISTURE SEAL application.
• Not for: Application over expansion joints, as reflective cracking may occur.
• Not for: Use as a final wearing surface. Always apply a suitable floor covering or topping system.
• Not for: Applications outside the 5°C to 35°C temperature range without consulting RLA technical support.

Choosing the right TruLevel leveller

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.