About UltraTech Tilefixo Sumo CT

UltraTech Tilefixo Sumo CT sits at the entry point of UltraTech’s Tilefixo tile-fixing range — a single-component, cement-based, polymer-modified adhesive purpose-built for one job: fixing ceramic tiles on floors and walls inside dry rooms. Where the rest of the Tilefixo family branches out into anti-damp formulations for wet zones (Aqua Marine VT), high-strength mixes for large-format tiles and natural stone (Royal NT), or deformable adhesives for external cladding (Ultima), Sumo CT stays deliberately narrow in scope. It is formulated, tested and priced as the everyday workhorse for the bulk of residential and light-commercial ceramic tiling that never touches water — bedrooms, living rooms, corridors, dry kitchens, and office interiors. That focus is precisely why it earns a place on so many Delhi NCR tiling schedules: contractors aren’t paying for wet-area or large-format capability on jobs that don’t need it.

Technically, the product complies with IS 15477:2019 as a Type 1T adhesive and with EN 12004:2017 / ISO 13007-1:2014 as Type C1T — both are normal-setting, cementitious, single-tensile-class classifications, which is the standard benchmark for general ceramic tile fixing rather than the S1/S2 deformable grades meant for movement-prone substrates. In practice this means Sumo CT is mixed with 24–27% potable water into a lump-free slurry, combed onto a properly prepared cement plaster, concrete, or screed substrate with a notched trowel, and tiles are pressed in within a 30-minute open time. Space Arc supplies it as part of a broader Tilefixo system — paired where needed with Readiplast RP or Floorkrete for substrate levelling, and TILEFIXO Style Epoxy Grout or CG Grout for the finishing joints — so site teams can source the full tiling package from one distributor instead of juggling multiple brands.

The technical insight

The two things worth understanding about Sumo CT’s chemistry are the polymer modification and the C1T classification. Plain cement-sand tile mortar is rigid, needs manual water-curing, and depends heavily on mason skill for consistent bond. Polymer modification changes that: redispersible polymer powders blended into the cement matrix improve workability, water retention, and — critically — adhesion to the substrate, while also enabling the self-curing behaviour that removes the daily water-spraying routine older mortars require. The EN 12004/ISO 13007 “C1T” rating breaks down as C (cementitious), 1 (normal initial tensile adhesion, the base class rather than the higher S1/S2 deformable grades), and T (reduced slip, meaning tiles won’t creep down a vertical wall before the adhesive sets). That combination — solid base-class adhesion without the deformability premium — is exactly why Sumo CT is priced and positioned for standard ceramic tiling rather than for large-format vitrified tiles or vibration-prone cladding, where the extra flexibility of Ultima or Royal NT actually matters. The permitted 3–12mm bed thickness range also places it as a thin-to-medium bed system, not a thick-bed levelling adhesive — undulating substrates still need to be trued up separately before tiling.

Where it is used

• Ceramic floor tiling in bedrooms, living and dining rooms of apartments and independent houses
• Ceramic wall tiling in dry interior zones — passages, lobbies, drawing rooms, and above-splash dry kitchen walls
• Fixing small and medium-format ceramic tiles over cement plaster, concrete slab, or cement screed substrates
• Interior fit-out and renovation tiling where the existing substrate is sound and only needs standard surface prep
• Builder-floor and row-house finishing packages specifying economical dry-area ceramic tiling
• Institutional and office interiors — corridors, cabins, and reception areas away from wet-process zones
• Government and mass-housing residential schemes where cost-efficient, code-compliant tile fixing is specified
• Re-tiling jobs during renovation, once old tiles and loose plaster have been removed and the base is cleaned

Key advantages

• Meets IS 15477:2019 Type 1T and EN 12004/ISO 13007 Type C1T — independently verifiable adhesion benchmarks, not just marketing claims
• Polymer modification and self-curing chemistry remove the daily water-curing routine that plain cement-sand tile mortars demand
• Single-component, factory-proportioned powder — no on-site guessing of cement-to-sand ratios, so bond quality is more consistent across masons
• 2-hour pot life gives crews a workable batch window without adhesive stiffening mid-shift
• 7.50 sq.m coverage per 20kg bag at 3mm bed keeps material cost per square metre predictable for estimating and billing
• Works directly over common substrates — cement plaster, concrete, and screed — without a mandatory primer coat in most conditions
• Non-toxic and non-flammable formulation, easier to handle and store on occupied residential sites
• Backed by UltraTech’s pan-India distribution and technical helpline, so replacement stock and site queries are rarely a bottleneck

Limitations & considerations

• Restricted to dry indoor areas — not rated for wet, damp, or continuously moist substrates; use Aqua Marine VT for wet-zone tiling
• Meant for small and medium-format ceramic tiles, not large-format vitrified tiles or natural stone, which need Royal NT or Ultima’s higher bond and deformability
• Not suitable for flexible substrates (fibre-cement sheet, plasterboard, timber) or for direct application onto metal, glass, plastic, or polyurethane membranes
• The 30-minute open and adjustable time is tight and shortens further in hot, dry weather — demands disciplined batch-and-tile scheduling from the crew
• Application is restricted to a 5°C–50°C range and needs extended cure time below 20°C, which matters for early-morning winter work in NCR
• Minimum bed thickness of 3mm means it isn’t a feather-thin skim product for very tight-tolerance re-tiling over already-level surfaces

Selection & best practice

Specifications

Industry use cases

How we position UltraTech Tilefixo Sumo CT

Sumo CT is the entry-level, dry-area workhorse of UltraTech’s Tilefixo lineup, and Space Arc typically cross-sells it alongside three siblings from the same family: Sumo CT Plus (adds small-format natural stone capability on dry floors), Aqua Marine VT (the step-up choice the moment a wet zone or vitrified tile enters the spec), and Royal NT (for medium/large-format tiles and outdoor or wet applications). For joint finishing, it pairs naturally with TILEFIXO Style Epoxy Grout or CG Grout, and for substrate prep, with Readiplast RP or Floorkrete. Outside the UltraTech family, the closest market comparisons are MYK Laticrete, Roff, and Weber’s entry-tier cementitious adhesives — tile fixing isn’t a category Fosroc plays in with a comparable retail product, so there’s no genuine Fosroc alternative to position here; specifiers weighing options against Sumo CT are almost always comparing it to other dedicated tile-adhesive brands, not Fosroc’s construction-chemicals range.

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