Tools & Support

Match the grade to the tile, the surface and where it is going. As a rule: S01–S02 for internal ceramic, S02+ once you move outdoors or onto stone, S03–S04 for wet areas, large formats and pools, and Flexit 2K for metal, ply and board substrates. Use the Tile & Stone Fixing category page or the calculator to confirm.

Yes — S02 and above are suitable for tile-on-tile, provided the existing tiles are sound, well-bonded and clean. Degrease the surface, key it if glazed, and prime where recommended on the datasheet before fixing.

Allow the adhesive to cure before grouting — typically 24 hours for standard S-series adhesives at normal temperatures, longer in cold or humid conditions. Always check the specific product TDS, as fast-set and heavy-duty grades differ.

They are the European classifications for cementitious adhesives. C1 is a standard adhesive; C2 has improved bond strength; the added T means slip-resistant and E means extended open time. Higher classes indicate performance for more demanding applications.

Yes — the flexible, deformable grades (S03, S04 and Flexit) are recommended over heated screeds and boards, as they accommodate the thermal movement. Commission and warm the system gradually as set out in the datasheet.

SUMO is sold through a network of authorised distributors and stockists. Use the distributor locator above to find your nearest supplier, or contact our team and we will point you to one.