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Mapei UC Leveller is a fast-setting, cement-based smoothing compound specifically formulated for high-volume substrate remediation in commercial and retail interiors. This fluid underlayment delivers a CT-C25-F7 industrial-grade finish, providing the compressive and flexural strength necessary to support heavy wheeled traffic while resisting shrinkage-induced cracking in lifts from 3mm to 70mm.
By integrating pumpable application and rapid-setting hydration cements, it allows for light foot traffic in 12 hours and floor installation in 24 hours, significantly reducing labor cycles on large-scale developments. For thicknesses exceeding 40mm, the addition of 3-5mm aggregate ensures structural stability and cost-effective bulk filling.
Frequently Asked Questions About UC Leveller
Q: Can UC Leveller be used on exterior surfaces?
A: No, UC Leveller is designed for interior use only. It should not be used in external or wet areas, or over substrates subject to rising damp.
Q: How long do I need to wait before installing flooring over UC Leveller?
A: Allow 12 hours for light foot traffic and 24 hours before installing flooring at 23°C and 50% RH. Drying times can vary depending on thickness, temperature, and humidity.
Q: What is the maximum thickness UC Leveller can be applied at?
A: UC Leveller can be applied in a single coat from 3mm to 70mm. For thicknesses above 40mm, it is recommended to add 30% aggregate.
Q: Do I need to prime the substrate before applying UC Leveller?
A: Yes, porous substrates should be primed with Eco Prim T Plus diluted 1:2 with water. Non-porous substrates require undiluted Eco Prim T Plus or Eco Prim Grip Plus. Follow specific priming instructions for different substrates.
Q: How do I prepare the mix for UC Leveller?
A: Pour 3.4-3.8 liters of clean water into a container and gradually add a 20kg bag of UC Leveller. Mix with an electric mixer at 300 RPM until a homogenous, lump-free mix is obtained. Let it sit for a few minutes and remix briefly.
Use UC Leveller for:
- Levelling and smoothing interior floors before installing various floor coverings.
- Creating a smooth surface for under-floor heating systems.
- Preparing substrates in high-traffic commercial and residential areas.
- Achieving a durable and even surface for tile, stone, and timber installations.
Why Use UC Leveller:
- Reduces substrate preparation time with its fast-hardening and self-levelling properties.
- Provides a strong, durable surface capable of withstanding heavy loads.
- Enhances productivity with its pumpable application.
- Ensures a smooth, even finish for various floor coverings.
- Minimizes shrinkage and cracking with its high-quality formulation.
How to apply UC Leveller:
- Prepare the substrate by cleaning and priming as required.
- Mix UC Leveller with water to a homogenous consistency.
- Spread the mix with a metal trowel or float, or apply with a pump.
- For a second coat, apply after 3 hours or prime with Eco Prim T Plus if more than 24 hours have passed.
- Allow to dry for 12-24 hours before installing flooring.
UC Leveller limitations:
- Do not use externally or in damp areas.
- Do not apply at temperatures below +5°C or above +35°C.
- Do not apply in thicknesses less than 3mm.
- Do not use over timber substrates.
Safety precautions when using UC Leveller:
- Personal Protective Equipment: Gloves, eye protection, and dust mask.
- Ventilation: Ensure adequate ventilation during mixing and application.
- Handling: Avoid skin and eye contact. Refer to the Safety Data Sheet for detailed safety instructions.
UC Leveller can be used on the following substrates:
- Concrete slabs and cement-based screeds.
- Existing ceramic tile, terrazzo, and natural stone floors.
- Magnesite floors (primed with Eco Prim T Plus).
- Substrates with under-floor heating installations.
| Document | Download |
|---|---|
| Mapei UC Leveller Technical Data Sheet | |
| Mapei UC Leveller Safety Data Sheet |
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