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When the slab is out of spec, but the project schedule isn't forgiving, you need a levelling compound that delivers on thickness and speed. UC Leveller takes significant variations, from 3 mm up to a robust 70 mm, in a single application. This means getting to the finished floor faster, without callbacks from cracking or shrinkage. It sets up rapidly for foot traffic in just 12 hours, keeping your project moving.
UC Leveller is engineered for demanding commercial and industrial floor preparation. It solves the challenge of creating exceptionally smooth, durable, and thick underlayments that can withstand heavy loads and traffic. Formulated with special fast-setting cements and graded silica sand, this compound delivers superior compressive and flexural strength, making it ideal for rapid turnaround projects where standard levelling compounds would fail under the load or thickness requirements.
This leveller handles significant floor imperfections, applying from 3 mm up to 70 mm thick in a single coat without significant shrinkage or cracking. This broad application window eliminates the need for multiple passes on deeply uneven surfaces. After 28 days, it achieves a high compressive strength of 30 N/mm² and a flexural strength of 8.5 N/mm². These strength metrics are critical for supporting heavy static and dynamic loads, including wheeled traffic, over its service life.
The compound cures rapidly, allowing for light foot traffic after 12 hours and flooring installation in just 24 hours. This fast track to finish significantly reduces project downtime, crucial for high-turnover commercial spaces.
UC Leveller mixes into a fluid, easy-to-work compound. It can be applied with a large metal trowel or, for maximum productivity on larger areas, with an automatic pressure pump. For applications exceeding 40 mm, an addition of 30% of 3-5 mm aggregate is recommended to maintain stability. The mixed batch has a working time of 20 to 30 minutes at 23ºC. Tools and hands clean easily with water while the product is still wet.
When applying a second coat, do so as soon as the first can be walked on (approximately 3 hours). If more than 24 hours pass between coats, prime the surface with Eco Prim T Plus, diluted 1 part primer to 2 parts water, to ensure proper adhesion.
UC Leveller typically functions as a mid-layer in a floor finishing system, providing the necessary level and strength. Substrates must be prepared by mechanical removal of all contaminants and then primed. Porous substrates require Eco Prim T Plus, diluted 1 part primer to 2 parts water, to control absorption and prevent pinholes. Non-porous surfaces like existing tiles or natural stone need either undiluted Eco Prim T Plus or Eco Prim Grip Plus for optimal bond.
While ceramic tiles, natural stone, and floating timber can be installed directly after 24 hours, installing soft floor coverings like timber, vinyl, or rubber requires an additional minimum 3 mm coat of Ultraplan or Ultraplan Eco over the cured UC Leveller. This ensures the required surface finish for these specific floor types.
UC Leveller complies with EN 13813 and is classified as CT-C25-F7. This classification confirms its cement-based (C) composition, its compressive strength (C25), and its flexural strength (F7), ensuring it meets the performance standards required for screed materials under demanding conditions.
No, UC Leveller is for interior applications only. It is not designed for exterior or wet areas, nor for substrates subject to rising damp.
You can install most floor coverings after 24 hours at 23°C and 50% RH. Light foot traffic is possible in 12 hours under these conditions.
UC Leveller can be applied in a single pass from 3mm up to 70mm. For layers above 40mm, incorporate 30% aggregate to maintain performance.
Yes, priming is critical for proper adhesion and to prevent issues like pinholes. Use Eco Prim T Plus diluted 1:2 for porous substrates, or undiluted Eco Prim T Plus or Eco Prim Grip Plus for non-porous surfaces.
| Application | Key benefit | Primary trades |
|---|---|---|
| Levelling and smoothing interior floors (3mm-70mm) | Delivers a highly flat and strong substrate (C25-F7) for all common floor coverings, preventing callbacks. | Flooring installers, Tilers, Builders |
| Preparing subfloors for under-floor heating systems | Provides a stable, even layer that protects heating elements and ensures efficient heat distribution. | Heating technicians, Flooring installers |
| Fast-track commercial and residential projects | Rapid hardening (light traffic in 12h, tiling in 24h) and pumpable application accelerate project timelines. | Commercial builders, Project managers, Flooring contractors |
| Reinstating damaged or uneven concrete slabs | Fills deep imperfections (up to 70mm) in a single application, creating a durable, load-bearing surface. | Concrete repairers, Building renovators |
Wear protective gloves, eye protection, and a dust mask during mixing and application.
Ensure adequate ventilation in the work area during mixing, application, and drying to prevent dust and vapour accumulation.
Store in original sealed packaging for up to 12 months in a dry environment. Dispose of waste material according to local regulations.
Effective substrate preparation is critical for any flooring project. This guide outlines requirements for common surfaces before applying UC Leveller.
Surface prep: Ensure the surface is clean, dry, sound, and free from all contaminants, laitance, or weak material.
Primer: Required. Use Eco Prim T Plus diluted 1:2 with water for porous surfaces.
Surface prep: Clean, dry, and free from contaminants. Degrease if necessary. Ensure all existing tiles are firmly bonded.
Primer: Required. Use undiluted Eco Prim T Plus or Eco Prim Grip Plus for non-porous surfaces.
Surface prep: Clean, dry, and sound. Remove any loose material or contaminants.
Primer: Required. Use Eco Prim T Plus.
Surface prep: Ensure the heating system is off and the substrate is stable before application.
Primer: Required. Follow priming guidelines based on the underlying substrate type (e.g., concrete).
| Property | Value |
|---|---|
| Colour | Grey |
| Density | 2100 kg/m³ |
| Consistency | Fine Powder |
| Solids Content | 100% |
| pH Value | > 12 |
| Compressive Strength | 30 N/mm² |
| Flexural Strength | 8.5 N/mm² |
| Initial Cure | 2-4 hours |
| Trafficable Time | 12 hours |
| Tiling Ready | 24 hours |
| Application Temperature | 5°C to 35°C |
| Mix Ratio | 17-19 parts water to 100 parts powder by weight |
| Coverage Rate | 1.8 kg/m² per mm of thickness |
| Bed Thickness | 3 mm to 70 mm |
| VOC Content | 0 g/L |
| Classification | CT-C25-F7 |
| Packaging | 20 kg bags |
| Storage Life | 12 months in original sealed packaging |
Here are some common examples on where Mapei UC Leveller used by our customers.
Flooring
When preparing commercial or industrial floors requiring a robust, thick, and durable underlayment capable of withstanding significant loads and traffic.
This compound achieves exceptional strength and thickness up to 70 mm in one application, resisting shrinkage and cracking for long-term performance under heavy use.
Flooring
On large projects or renovations needing quick substrate preparation and fast turnaround for installing new floor coverings like tiles or carpet.
Its pumpable nature and rapid hardening allow light foot traffic within 12 hours, significantly reducing project timelines and increasing productivity.
Tiling
Renovating existing hard floors such as ceramic tile, terrazzo, or natural stone to create a perfectly smooth, level surface for new coverings.
It provides a highly flowable, smooth finish over various hard substrates, ensuring an ideal base without the need for extensive substrate removal.
Flooring
When preparing commercial or industrial concrete slabs for heavy loads, requiring 3-70mm levelling with rapid installation.
Achieves stable, thick underlayment without shrinkage or cracking, ensuring durability and quick readiness for heavy wheeled traffic.
Flooring
When renovating existing ceramic tile, terrazzo, or natural stone floors, requiring quick smoothing before new finishes.
Its rapid cure time allows floor installation within 24 hours, minimising downtime and simplifying preparation over varied surfaces.
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