Tile adhesive bags carry a code like 'C2TE S1'. Every character matters. C means cementitious. The number is the performance class: C1 is standard adhesion (≥0.5 N/mm²), C2 is improved (≥1 N/mm²) — required for porcelain, which absorbs almost no water and needs the stronger chemical grip.
T means thixotropic — no vertical slip, essential for wall tiling. E means extended open time, which matters in UAE heat where mortar skins over fast. S1 and S2 are deformability classes: S1 adhesives flex to absorb substrate movement, which is why they're specified for large-format tiles, facades, and tiling over screeds with underfloor services.
The practical rules: ceramic wall tiles indoors — C1T is fine. Porcelain floors 60×60 and up — use C2TE minimum. Anything over 80 cm, external, or on a facade — C2TE S1, no exceptions. Swimming pools — C2 adhesive plus epoxy (RG) grout. Using a C1 adhesive under big porcelain is the single most common cause of hollow-sounding tiles eighteen months after handover.
Coverage matters as much as class. Large-format tiles need back-buttering plus a notched trowel bed to hit the 90%+ contact consultants ask for. Budget roughly 4–6 kg/m² for 60×60 porcelain.
We stock Henkel and equivalent adhesives from C1T to C2TE S1 with colour-matched grouts — ask for the right class for your tile, and we'll match it to your budget.
Questions about this topic?
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