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Use RLA TruLevel BulkFill UT for: Rapidly correcting deeply uneven internal concrete floors from 3mm up to a massive 70mm in a single application, creating a flat, strong base for floor coverings.
Tired of fighting deeply uneven subfloors with multiple layers and days of work? RLA TruLevel BulkFill UT is the heavy-duty, time-saving solution for serious floor levelling. This high-performance, self-levelling underlayment is engineered to eliminate significant height differences, from 3mm to a massive 70mm, in just one pour. Its excellent flow properties create a mirror-flat, smooth surface with minimal effort, while its pumpable nature makes it the ultimate choice for rapid installation on large-scale projects. Get a certified, high-strength foundation ready for floor coverings faster.
Product Details:
Primer Information: Correct priming is essential for a successful application. For porous concrete, prime with RLA Universal Primer diluted 1:2 with clean water; a second coat may be needed on highly absorbent surfaces to prevent pinholes. For non-porous substrates like existing tiles or membranes, apply RLA Universal Primer neat (undiluted) and allow it to dry to a tack-free film.
Setting & Cure Time: Keep your project moving with predictable set times. RLA TruLevel BulkFill UT is walkable in just 3-4 hours at 23°C. It’s ready to accept carpet, tiles, and floating floors after approximately 24-36 hours, allowing for efficient project scheduling. Note that drying times will be extended in cooler temperatures or high humidity.
Coverage Rate: A single 20kg bag of RLA TruLevel BulkFill UT will cover approximately 2.4 square metres at a thickness of 5mm. This allows for accurate material estimation, helping you budget your projects effectively and minimise waste.
Application Temperature Range: Developed in Australia for local conditions, it can be applied in temperatures from +5°C to +35°C. For optimal results and curing, the substrate temperature must be at least 10°C.
Application Thickness: This is where BulkFill UT excels. Its high-build formula allows for a true one-pass application from a minimum of 3mm for feathering up to a maximum of 70mm to fill deep voids. This versatility eliminates the need for multi-layering, saving immense time and labour costs compared to standard levellers.
EN 13813 Classification (CT-C30-F6): This product is certified to rigorous international standards. This code confirms it is a Cementitious screed material (CT) with a final Compressive strength of over 30 MPa (C30) and a Flexural strength of over 6 MPa (F6). This gives you, your client, and your engineers verifiable proof of its strength and durability.
Key Features of RLA TruLevel BulkFill UT & What They Mean For You
- Single Pour from 3mm to 70mm: Saves you incredible amounts of time and labour. Correct major subfloor imperfections in one go without the need for slow, layered applications.
- Pumpable for Rapid Installation: Dramatically increase your productivity on large commercial floors. Pumping allows you to lay vast areas quickly and efficiently with a smaller team.
- Excellent Self-Levelling Flow: The product does the work for you, flowing out to a super smooth, flat finish with minimal trowel work, ensuring a perfect base for the final floor covering.
- Walkable in 3-4 Hours: Minimises downtime on site. Once set, your team and other trades can get back on the floor to continue work, accelerating the entire project timeline.
- High Mechanical Strength (C30/F6): Provides a durable, rock-solid foundation that resists cracking and compression under load, ensuring the longevity of the entire flooring system.
Why Choose RLA TruLevel BulkFill UT:
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Problem: You're facing a badly uneven floor that will take days to level with standard products.
Solution with RLA TruLevel BulkFill UT: Its 70mm single-pour capability turns a multi-day job into a single, efficient application, saving you labour costs and getting you to the next stage faster. -
Problem: Achieving a perfectly flat finish over a large area is slow and difficult.
Solution with RLA TruLevel BulkFill UT: Its superior self-levelling properties and pumpability combine to deliver a consistently flat floor with speed and ease, ensuring a premium result every time. -
Problem: You need absolute certainty that your subfloor underlayment meets specification.
Solution with RLA TruLevel BulkFill UT: It is certified to EN 13813 (C30-F6), providing verifiable proof of its high compressive and flexural strength, giving you and your clients total peace of mind.
When to Choose RLA TruLevel BulkFill UT Over Other Options:
- Choose RLA TruLevel BulkFill UT over standard self-levelling compounds when: your required depth is greater than 20mm. Its high-build formula is specifically designed for these deep-fill applications where standard levellers would require multiple costly and time-consuming layers.
- Choose RLA TruLevel BulkFill UT over traditional sand/cement screeds when: you need speed and a smooth finish. It sets in hours, not days, and its self-smoothing properties eliminate the intensive labour of trowelling a traditional screed.
- RLA TruLevel BulkFill UT is particularly effective for: Large-scale commercial floors, levelling old and worn concrete, and any situation where floor height needs to be raised significantly and quickly.
- Consider other solutions when: you need to direct stick timber flooring (not suitable), or when preparing a floor for vinyl or rubber. For these sensitive coverings, over-coat the cured BulkFill UT with a 2-3mm layer of TruLevel EconoPro or TruLevel TuffTop as recommended.
Trade-Specific Applications & Pro Tips for RLA TruLevel BulkFill UT:
For Flooring Contractors & Tilers:
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Application Focus: Levelling a large, uneven warehouse floor for carpet tiles.
- Micro-Guide: 1. Shot blast the floor to create a clean, porous profile. Vacuum all dust. 2. Prime with diluted RLA Universal Primer. 3. Set up a continuous mixing pump. 4. Pump the product onto the floor, using a gauge rake to guide it to the required 10-20mm depth. 5. Use a spiked roller to release any trapped air.
- Performance Benefits: Allows a huge area to be prepped in a fraction of the time of manual mixing, creating a perfectly flat and durable base ready for tile adhesive.
- Pro Tip: Work in a continuous "wet edge" from the furthest point back towards the exit to ensure a seamless finish.
- Common Pitfall to Avoid: Overwatering the mix. This causes separation, bleeding, and a significant reduction in final strength. Always use the specified 3.6-3.8L of water per 20kg bag.
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Application Focus: Preparing an old concrete slab for large format tiles.
- Micro-Guide: 1. Diamond grind the slab to remove contaminants and create a profile. 2. Prime thoroughly. 3. Mix batches and pour onto the floor, using a trowel to guide the mix into deeper sections first.
- Performance Benefits: Its high strength (30 MPa) prevents cracking under load, providing the rigid, stable base required to prevent lippage and failure of expensive large format tiles.
How to use RLA TruLevel BulkFill UT
- Essential Tools & Setup: Heavy-duty drill with a suitable mixing paddle, measuring bucket for water, gauge rake or stand-up spreader, spiked roller, and smoothing trowel. For large jobs, a mixing pump is ideal.
- Surface Preparation – The Key to Success: The substrate must be sound, clean, and free of any contaminants. Mechanical preparation (shot blasting/diamond grinding) is highly recommended to create an open, porous surface for maximum adhesion.
- Trade-Specific Pro Tips for Optimal Results: Use a spiked roller immediately after pouring to release any entrapped air and further improve the smooth finish. In hot weather, working in the cooler parts of the day can help maximise your open time.
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Troubleshooting Common On-Site Issues:
- Issue: Pinholes appearing on the surface. Solution: The substrate was too porous and absorbed water from the mix. A second coat of diluted RLA Universal Primer is required before re-applying.
- Issue: The product sets too fast. Solution: The ambient or substrate temperature is too high, or the product was mixed with warm water. Use cool, clean water and try to control the site temperature if possible.
Storage, Shelf Life, and Handling
- Optimal Storage Conditions: To ensure the 12-month shelf life, store bags in a cool, dry area, elevated off the ground and protected from all moisture and humidity.
- Handling & Disposal: This is a cement-based product. Avoid breathing dust. Pour any unused mixed material into an empty bag and allow it to set hard before discarding. Do not pour down drains.
Certifications and Compliance
- EN 13813 Classification CT-C30-F6: This product is certified to meet the stringent European standard for screed materials. This guarantees its performance characteristics, providing verifiable data on its high compressive (C30) and flexural (F6) strength for complete peace of mind in architectural and engineering specifications.
- Australian Developed: Formulated in RLA's Australian research laboratories specifically for local conditions and building practices.
Frequently Asked Questions About RLA TruLevel BulkFill UT
Q: Why can't I stick timber flooring directly to RLA TruLevel BulkFill UT?
A: RLA TruLevel BulkFill UT is designed as a high-build underlayment. While very strong, direct-stick timber flooring requires specific surface properties and adhesive compatibility that BulkFill UT is not formulated for. It is the perfect base for floating timber floors, but not for direct adhesion.
Q: Do I really need to prime the concrete first?
A: Yes, priming is a non-negotiable step. Priming with RLA Universal Primer prevents the concrete from sucking water out of the levelling compound too quickly, which can cause cracking and a weak surface. It also seals the substrate to prevent pinholes and dramatically improves the bond strength.
Q: What happens if I add too much water to the mix?
A: Overwatering is a critical mistake. It will cause the cement and sand to separate (bleed), leading to a weak, dusty surface once cured. The final compressive and bond strengths will be severely compromised. Always use the specified 3.6-3.8 litres of clean water per 20kg bag.
Q: How do I know if my substrate is porous or non-porous?
A: Use the simple water drop test. Place a few drops of water on the surface. If the water soaks in within a minute, the substrate is porous and requires a diluted prime coat. If the water beads and sits on the surface, it is non-porous and requires a neat (undiluted) prime coat.
Q: Can I use RLA TruLevel BulkFill UT over old ceramic tiles?
A: Yes, you can. The tiles must be extremely well bonded, clean, and free of any sealers or waxes. Treat the tiled surface as non-porous and apply RLA Universal Primer neat. A light grind of the tile glaze is recommended to enhance adhesion further.
Q: Is this product suitable for outdoor use?
A: No. RLA TruLevel BulkFill UT is designed and specified for internal use only. It should not be applied in areas subject to weather or rain and must not be applied over substrates with rising damp issues.
Applications Where RLA TruLevel BulkFill UT Excels:
- Large Commercial Floors: Its pumpability and flow make it perfect for quickly levelling vast areas in warehouses, retail spaces, and showrooms.
- Old Floor Refurbishments: Ideal for correcting badly worn or uneven concrete slabs in renovation projects, providing a fresh, flat start.
- Deep Fill Applications: Any area with significant dips, troughs, or height variations up to 70mm that need to be eliminated in a single, efficient pass.
- Underfloor Heating Installations: Suitable for screeding over under-floor heating systems, providing a solid, stable, and thermally conductive mass.
Top Benefits of Using RLA TruLevel BulkFill UT on Your Projects:
- Massive Time & Labour Savings: Its core benefit. The 70mm single-pour capability turns what would be a multi-day, multi-layer process into a single, efficient application.
- Flawless Finish, Less Effort: The superior self-levelling properties deliver a mirror-flat floor with minimal trowelling, providing a perfect base for any subsequent floor covering and enhancing your final - finish.
- Certified Performance & Peace of Mind: With a certified EN 13813 rating for high strength, you can install with confidence, knowing the underlayment is durable, reliable, and meets engineering specifications.
- Increased Productivity: The combination of pumpability, excellent flow, and fast walk-on time means you can complete floor preparation jobs faster, more efficiently, and with a smaller team.
Step-by-Step Application Guide for RLA TruLevel BulkFill UT:
- Preparation is Paramount: Mechanically prepare the substrate by diamond grinding or shot blasting to ensure it is sound, open-pored, and free of all contaminants. Thoroughly vacuum all dust.
- Priming: Apply RLA Universal Primer according to the substrate's porosity (diluted for porous, neat for non-porous). Allow primer to dry completely to a tack-free film before proceeding.
- Mixing: Add 3.6-3.8 litres of clean, cool water to a mixing bucket. Slowly add the 20kg bag of powder while mixing with a heavy-duty drill and paddle. Mix for approx. 3 minutes until a smooth, lump-free consistency is achieved.
- Application Technique: Pour the mixed compound onto the primed floor immediately. Use a gauge rake or spreader to guide the material to the desired thickness. Work quickly to maintain a wet edge. The product will flow and level itself.
- Finishing: Within 10-15 minutes of pouring, use a spiked roller across the area to release any trapped air bubbles and perfect the smooth finish.
- Curing Process: Protect the area from drafts for the first few hours. Allow to cure. The floor will be walkable in 3-4 hours and ready for most coverings in 24-36 hours, depending on site conditions.
Important Limitations & Safety When Using RLA TruLevel BulkFill UT:
Product Limitations:
- Internal Use Only: This product is not designed to withstand weathering and must only be used in internal, dry applications.
- No Direct-Stick Timber: Not suitable as a final substrate for directly adhered timber flooring. Use for floating floors only.
- Not for Vinyl/Rubber: For direct application of vinyl or rubber flooring, an additional 2-3mm skim coat of a suitable finishing compound like TruLevel EconoPro or TuffTop is required over the cured BulkFill UT.
- No Rising Damp: Do not apply to substrates subject to rising damp. A suitable moisture barrier like RLA MOISTURE SEAL must be applied first.
- Do Not Apply Over Expansion Joints: Honour all movement joints in the substrate. Applying over them will cause reflective cracking.
Safety First – Protecting Yourself and Your Workspace:
- Personal Protective Equipment (PPE): This is a cementitious product. Wear safety glasses, suitable gloves, and standards-compliant respiratory protection (P2 mask) to avoid breathing dust.
- Ventilation: Always ensure adequate ventilation in the work area.
- Safe Handling Practices: Avoid contact with skin and eyes. Do not eat, drink, or smoke while using. Wash hands thoroughly after handling.
- First Aid Essentials: If dust is inhaled, move to fresh air. If the product contacts skin, wash with soap and water. For eye contact, rinse with water for several minutes. Always refer to the Safety Data Sheet (SDS) for complete information.
RLA TruLevel BulkFill UT Adhesion Profile – Compatible Substrates:
- Concrete (Porous): Must be sound, clean, and mechanically prepared (ground/shot-blasted). Prime with RLA Universal Primer diluted 1:2 with water. Highly absorbent floors may need a second coat.
- Ceramic Tiles (Non-Porous): Tiles must be soundly bonded and thoroughly cleaned. A light grind is recommended. Prime with a neat, undiluted coat of RLA Universal Primer.
- Burnished Concrete (Non-Porous): Must be mechanically ground to remove the burnished finish and create a profile. Clean thoroughly and prime with a neat, undiluted coat of RLA Universal Primer.
- Liquid Waterproofing Membranes: Compatible with RLA's cementitious waterproofing membranes. Treat as a non-porous surface and prime with neat RLA Universal Primer.
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