A grey rapid setting and drying cement-based adhesive for fixing uncalibrated natural stone and slate tiles where a varying thickness of adhesive bed is required, e.g. 5–20 mm. Used to fix floor and wall tiles internally in dry or intermittently damp locations, which can be grouted and subjected to loads three hours after fixing at 20ºC. Especially useful when fixing natural stone where the adhesive bed has to dry quickly to reduce the risk of moisture staining of the stone. The adhesive adheres strongly onto concrete and cement and sand screeds, including heated sub-floors.

ARDEX S 20 is not recommended for fixing tiles in swimming pools or external locations.

General information

Uniclass 2015

Pr_20_31_02_12 Cementitious adhesivesPrimary


M40/110 Tiling to

M40/120 Mosaic to

M40/5 Tiling to

Specification data - Cementitious adhesives

Product Reference

ARDEX S 20 Flexible Rapid Hardening and Rapid Drying Natural Stone Tile Adhesive


Solid for use on walls

Solid for use on floors

Product Options


Consult ARDEX’s technical literature for details and fixing guidance.

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