RLA Aftek TruLevel BulkFill UT

For leveling thick, uneven sections on new or existing internal concrete substrates, Aftek TruLevel BulkFill UT provides a high-build, rapid-hydrating underlayment that pours from 3mm up to 70mm in a single application. It develops a smooth, highly mechanically resistant surface ready to accept carpet, carpet tiles, ceramic tiles, and floating floor finishes.

High-build subfloor leveling

Aftek TruLevel BulkFill UT is formulated with rapid-setting cement, graded silica sand, resins, and special additives to flow easily and self-level over large height variations. The compound cures rapidly to achieve a compressive strength of over 30 N/mm² at 28 days, ensuring a stable, durable foundation under heavy foot traffic. It is also compatible with under-floor heating systems, provided the installation aligns with the heating manufacturer's specific recommendations.

Numbers that matter

• 3mm to 70mm application thickness: Allows for single-coat build-ups to level deep transitions and significant subfloor deviations without cracking.
• 30-40 minutes open time: Gives installers a workable wet window at 23°C, though the mixed batch must be placed within 15 minutes of mixing.
• 3 to 4 hours walk-on time: Rapid-setting hydration allows early access for trades to walk over the subfloor without damaging the surface.
• 24 to 36 hours drying time: Ready to receive carpet, ceramic tiles, and floating floors fixed with adhesives after 24 hours at 23°C (drying times extend in colder conditions).
• CT-C30-F6 classification: Meets EN 13813 performance standards, achieving a compressive strength of over 30 N/mm² and a flexural strength of over 6 N/mm² at 28 days.
• 2.4m² coverage per bag: Based on a standard 20kg bag applied at a thickness of 5mm.

Where to use it

Aftek TruLevel BulkFill UT is suitable for preparing internal floors before laying final coverings. Compatible substrates and applications include:

• New and existing internal concrete subfloors.
• Porous substrates primed with diluted RLA Universal Primer (1 part primer to 2 parts water).
• Non-porous substrates, including burnished concrete, existing ceramic tiles, and liquid waterproofing membranes, primed with undiluted RLA Universal Primer.
• Enclosed rooms prepared for carpet, carpet tiles, ceramic tiles, and floating floors.

Limitations

• Internal use only: Do not use on external slabs or areas exposed to weather.
• Direct stick timber: Not suitable for direct stick timber flooring applications.
• Dampness and moisture: Do not apply to substrates subject to rising dampness. Do not allow the compound to come into contact with water during or after the curing process. Substrates with high moisture levels require an application of RLA Moisture Seal first.
• Expansion joints: Do not apply over expansion joints, as reflective cracking may occur.
• Mixing limits: Do not overwater during mixing (use 3.6 to 3.8 litres of clean water per 20kg bag), as this causes bleeding, material separation, and reduced bond and tensile strength.
• Resilient flooring restriction: If vinyl or rubber flooring is to be installed, you must first apply a 2-3mm overcoat of TruLevel EconoPro or TruLevel TuffTop. Prime the dry BulkFill UT with neat Universal Primer before applying the final smoothing compound.
• Temperature limits: Do not install if the subfloor temperature is below 10°C, or if ambient temperatures are below 5°C or above 35°C.

Installation

Substrates must be dry, sound, clean, and free of wax, grease, oil, polishes, old adhesive, and curing compounds. Mechanical preparation, such as shot blasting or diamond grinding, must be used to remove surface sealers and provide a clean, open porous profile. Vacuum all dust and loose debris before priming.

To determine substrate porosity, perform a water drop test using a puddle the size of a 10-cent coin. If the water absorbs in less than 1 minute, the subfloor is porous; if the puddle remains, it is non-porous. Apply RLA Universal Primer accordingly, ensuring non-porous surfaces are primed neat and allowed to dry to a tack-free transparent film (approximately 2 hours at 23°C) before pouring the leveler. Mix the powder into the water at low speed for 3 minutes using a drill and mixing paddle until a lump-free consistency is achieved.