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RLA Aftek TruLevel BulkFill UT is a high-build, pumpable cementitious underlayment engineered for internal concrete remediation and underfloor heating encapsulation. Classified as CT-C30-F6, this rapid-setting formula achieves foot traffic readiness in 3-4 hours and can be poured up to 70mm in a single lift without compromising mechanical resistance or bond strength.
The self-smoothing compound is compatible with RLA moisture seals and primers, ensuring a continuous seal and membrane adhesion when preparing substrates for carpet, tiles, or floating floor systems. To prevent reflective cracking, do not apply over expansion joints, and ensure substrate temperatures remain above 10°C to avoid bond failure.
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- Choosing a selection results in a full page refresh.