For levelling new or existing substrates before installing carpet, ceramic tiles, natural stone, or floating timber flooring, UC Leveller is a fast-hardening underlayment compound that flows easily and pumps efficiently. It handles thicknesses from 3 mm to 70 mm in a single application without significant shrinkage, providing a smooth surface capable of carrying heavy loads, including wheeled chair traffic.
UC Leveller is a cement-based compound that cures rapidly to prepare uneven subfloors for floor coverings. Formulated with fast-setting cements, silica sand, and resins, the wet mix maintains high fluidity for self-levelling and can be placed using automatic pressure pumps to increase daily productivity on large areas. It complies with EN 13813 as a Class CT-C25-F7 levelling compound, developing excellent compressive and flexural strength to resist impact, abrasion, and structural load under subsequent floor systems.
Substrates must be dry, solid, and completely free of dirt, loose material, paint, wax, oils, rust, gypsum, and curing or sealing compounds. All curing and sealing compounds must be completely mechanically removed to achieve a minimum concrete surface profile of CSP #3. Cracks in cement substrates must be repaired first with Eporip. If a moisture vapour barrier is required, install Primer MF, Mapeproof 1K Turbo, or Planiseal MR before levelling.
Porous substrates must be primed with Eco Prim T Plus (diluted 1:2 with water) to prevent debonding and manage absorption; apply the leveller between 2 and 24 hours after priming. Non-porous surfaces (ceramic tiles, natural stone) must be cleaned of wax and primed undiluted with Eco Prim T Plus or Eco Prim Grip Plus. Magnesite subfloors require priming with Eco Prim T Plus.
To mix, pour 3.4 to 3.8 litres of clean water into a container and gradually add the 20 kg bag of UC Leveller. Mix at 300 RPM with an electric mixer until free of lumps, let sit for a few minutes, and remix briefly. Spread with a large metal trowel or float, or apply by pump. If a second coat is needed, apply it as soon as the first coat can be walked on (approximately 3 hours at +23°C). If the first coat dries completely (exceeding 24 hours), you must prime with Eco Prim T Plus diluted 1:2 with water before pouring the next coat.
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.
