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RLA TruLevel BulkFill UT Leveller: A Technical Overview
RLA TruLevel BulkFill UT is a high-build, pumpable self-levelling cementitious underlay for internal floors. Applied 3–70 mm in one coat, it produces a smooth, even surface with reliable mechanical performance (classified CT-C30-F6). Typical foot traffic is achievable in 3–4 hours at 23 °C and most floor coverings can be installed in 24–36 hours, streamlining programs while safeguarding finish quality.
3–70 mm
One-pour application range
Core Features & Specifications
- Pumpable, high-build leveller for fast coverage on commercial areas.
- Thickness range: 3–70 mm in a single pour.
- Foot traffic in 3–4 hours; most coverings in 24–36 hours at 23 °C.
- High performance classification CT-C30-F6 (EN 13813).
- Coverage: approx. 2.4 m² per 20 kg bag at 5 mm.
- Mixing ratio: 3.6–3.8 L clean water per 20 kg; pot/open time ~30–40 min.
- Compatible with underfloor heating (confirm with system supplier).
The RLA TruLevel BulkFill UT Advantage
- Time certainty: rapid set and early traffic reduce downtime.
- Finish certainty: excellent flow delivers a smooth, even surface.
- System certainty: designed to work with RLA primers, moisture seals and adhesives.
Proactive Troubleshooting
Scenario: High subfloor moisture (>75% RH)
Potential Outcome: Bond failure or surface instability.
Adheseal Best Practice: Install a compatible moisture barrier before levelling; then prime per substrate requirements.
Scenario: Over-glossed or sealed non-porous surfaces
Potential Outcome: Reduced mechanical key and adhesion.
Adheseal Best Practice: Mechanically remove coatings/curing compounds; light grind/sand very dense surfaces; prime neat with Universal Primer and dry to a tack-free clear film before pouring.
Applications in Practice: Trade Scenarios
For Flooring Contractors (On-site Applicator): Deep relevels in commercial tenancies
The Professional's Challenge
Large, uneven slabs need depth up to 70 mm with quick return to trades and minimal rectification risk.
The Adheseal Solution: Engineered Certainty in Practice
Prime substrate (1:2 diluted on porous; neat on non-porous). Mix each 20 kg bag with 3.6–3.8 L water for a lump-free mix; pump or rake to height. Walk in 3–4 h; schedule coverings in 24–36 h.
Best Practice Note
Maintain substrate temperature ≥10 °C; protect from water during cure to avoid soft surface formation.
For Builders (Coordinator): Over-tiling or floating floors on tight programs
The Professional's Challenge
Handover deadlines require predictable drying before carpet/tiles/floating floors without surface defects.
The Adheseal Solution: Engineered Certainty in Practice
Pour 3–20 mm to tune levels; use Universal Primer and observe the 24–36 h wait for coverings (longer in cold, damp conditions). For vinyl/rubber, over-skim 2–3 mm with TruLevel EconoPro or TuffTop after priming neat.
Best Practice Note
Avoid joints: do not bridge expansion joints to prevent reflective cracking.
Frequently Asked Questions
What thickness can I apply in a single pour?
3–70 mm in one coat. Use a gauge rake or pump to achieve depth and finish uniformly. Avoid bridging expansion joints.
When is it ready for traffic and floor coverings?
Typically walkable in 3–4 hours at 23 °C. Most floor coverings can be installed after 24–36 hours; allow longer in cold or humid conditions.
What is the correct mixing ratio and pot life?
Mix each 20 kg bag with 3.6–3.8 L clean water for ~3 minutes to a lump-free consistency. Working/open time is about 30–40 minutes at 23 °C—do not over-water.
How should I prime different substrates?
Porous concrete: Universal Primer 1:2 (primer:water). Non-porous (burnished concrete, ceramic tiles, cured membranes): apply primer neat and allow to dry to a clear, tack-free film before pouring.
Is it suitable under vinyl or rubber?
Yes—after cure, skim a 2–3 mm layer of TruLevel EconoPro or TuffTop over a neat primer for a finer finish before installing resilient floorings.
Applications & Benefits
| Application / Use Case | Key Benefit | Primary Trades |
|---|---|---|
| Levelling internal concrete (3–70 mm) | Smooth, even surface; high strength | Flooring Contractors, Builders |
| Pump application on large areas | Faster installation; consistent finish | Commercial Flooring Contractors |
| Under carpet, tiles & floating floors | Return to trade quickly; coverings in 24–36 h | Floor Layers, Tilers |
| Over resilient floor prep | Fine finish via 2–3 mm skim with EconoPro/TuffTop | Floor Layers |
Applying RLA TruLevel BulkFill UT Leveller: Enhanced Protocols & Best Practices
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Assess Substrate & Porosity
Confirm the slab is clean, dry and sound. Use a 10-cent water drop test to determine porosity and set the priming method.
Timing: Subfloor ≥10 °C; avoid application <5 °C or >35 °C. -
Prime the Substrate
Porous: Universal Primer 1:2 (primer:water). Non-porous: Universal Primer neat to a clear, tack-free film (~2 h at 23 °C).
Pro Tip: Very porous surfaces may require a second diluted coat to prevent pinholes. -
Mixing
Per 20 kg, add 3.6–3.8 L clean water; mix ~3 min to a lump-free blend. Do not over-water.
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Application
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.
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Cure & Over-Laying
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.
Limitations & Safety
Product Limitations
Internal use only; protect from water during and after cure.
Not suitable for direct-stick timber flooring.
Do not bridge expansion joints; reflective cracking may occur.
Safety & Handling Requirements
Personal Protective Equipment
Wear gloves, eye protection and suitable clothing. Avoid skin/eye contact.
Ventilation
Use in well-ventilated areas; do not breathe dust.
First Aid Overview
Eyes: rinse with water; remove lenses. Skin: wash with soap/water. If swallowed: do not induce vomiting; give water and seek medical advice.
RLA TruLevel BulkFill UT Leveller Application Guide
Porous Concrete
Surface Preparation
Clean, sound, dry; remove wax/grease/curing compounds. Mechanically prep if required (shot blast/diamond grind); vacuum dust. Subfloor ≥10 °C.
Primer Requirements
Dilute 1:2 (primer:water)
Very porous surfaces may need a second coat to avoid pinholes.
RLA Universal PrimerNon-Porous (Burnished Concrete, Ceramic Tiles, Cured Membranes)
Surface Preparation
Remove coatings/curing compounds mechanically. Lightly sand/grind extremely dense surfaces to enhance key; clean and dry.
Primer Requirements
Apply neat (undiluted)
Allow ~2 h at 23 °C to a tack-free clear film before pouring.
RLA Universal PrimerMoisture-Affected Substrates
Surface Preparation
Do not install over rising damp. Where RH is high, install a moisture barrier before priming.
Primer Requirements
Primer over the cured moisture barrier as directed
Follow barrier cure times; then prime and pour.
RLA Moisture Seal + Universal Primer
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