Description
Roberts UltraFlo Premium Floor Leveller rapidly self-levels new or existing internal concrete substrates from a thin 1mm skim up to a substantial 30mm build, developing a smooth, even surface with genuinely high mechanical resistance. Classified CT-C30-F6 under EN 13813, it’s rated for real compressive and flexural performance rather than just self-levelling flow, matching the same high-performance classification as Roberts EcoFlo.
Its speed is the standout figure: most floor coverings — vinyl, carpet, linoleum, floating floors and tile — can go down after approximately 12 hours at 23°C, with the surface hardening enough to walk on after just 2-3 hours. Timber flooring specifically needs a minimum 3mm levelling coat when installed over concrete, and a longer 24-hour wait before installation, reflecting timber’s greater sensitivity to residual moisture and substrate flatness.
Technical Specifications
| Thickness range | 1-30mm per coat |
|---|---|
| Classification | CT-C30-F6 (EN 13813) |
| Mixing ratio | 20kg bag with 5.0-5.2L clean water |
| Pot life | 15 minutes at 23°C |
| Walkable | 2-3 hours at 23°C |
| Most floor coverings ready | Approx. 12 hours at 23°C |
| Timber flooring installation | 24 hours (minimum 3mm coat over concrete) |
| Coverage | 12m² per bag @ 1mm; 4m² per bag @ 3mm |
| Packaging | 20kg bags |
Where to Use
- Levelling new and existing internal concrete substrates before vinyl, carpet, linoleum, floating floors, timber or tile
- Underfloor heating systems
- Areas requiring pumped application for larger jobs
How to Apply
- Prepare the substrate — dry, sound, clean, free of wax, grease, old adhesive and high moisture; mechanically prepare if required.
- Prime — apply Roberts R48 Universal Primer, diluted 1:2 for porous substrates or neat for non-porous ones.
- Mix — combine one 20kg bag with 5.0-5.2L clean water for approximately 3 minutes to a lump-free consistency.
- Apply — spread in one coat from 1mm to 30mm using a gauge rake, spreader, trowel, or pump for larger areas, within the 15-minute pot life.
- Allow to cure — walkable after 2-3 hours; ready for most floor coverings after approximately 12 hours.
Important Notes
- Do not overwater the mix — excess water causes bleeding, separation and reduced bond and tensile strength.
- Not suitable for particle board floors, or application over expansion joints.
- Do not allow contact with water during or after curing, and do not apply to substrates subject to rising dampness.
< That range genuinely simplifies material ordering on a job with uneven substrate levels, since one product and delivery covers both a thin skim and a deep level-up section of the same floor. Choosing the correct primer for the substrate type — diluted for porous surfaces, neat for non-porous ones — is what actually determines whether UltraFlo bonds reliably, rather than the levelling compound itself being the limiting factor. Working through the mixed batch within its 15-minute pot life, rather than mixing more than can realistically be placed in that window, avoids the compound beginning to set before it's fully spread and levelled.
UltraFlo and Roberts EcoFlo share the same CT-C30-F6 classification and similar 1-30mm thickness range, which raises the fair question of when to choose one over the other — in practice, both perform to the same mechanical standard, and the choice on a given job often comes down to product availability, established trade preference, or matching an existing specification already used elsewhere on the same project.
