Choose a tile adhesive by matching three things: the tile's water absorption (porcelain needs higher-bond C2 class adhesives), the substrate (concrete, screed, existing tile or board), and the exposure (submerged, external facade, wet area or dry interior). Large-format and low-absorption tiles always need a polymer-modified cementitious adhesive, not traditional sand-cement.
Classification shorthand
C1 is a standard cementitious adhesive, C2 an improved one with higher bond strength. The suffix T means slip resistance, E means extended open time, and S1/S2 denote deformability for substrates that move.
Coverage and back-buttering
External and wet-area tiling requires near-total adhesive coverage behind the tile. Notch trowelling alone often leaves voids under large formats, so back-buttering the tile is standard practice.
Grout is part of the system
Joint width, movement joints and grout type (cementitious versus epoxy) determine whether a technically correct adhesive installation still stains, cracks or leaks in service.
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Reviewed by
Dr. Tanvir Rahman
Quality & Materials Science Advisor
Ph.D. Materials Science, polymer-modified mortars
See our technical advisory panelStandards referenced
- —EN 12004 / ISO 13007: Adhesives for ceramic tiles — classification
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