Ardex S21 GREY 22Kg – Pallet Deals and Bulk Buy – Rapid Setting Floor Tile Bedding Mortar (Tile Adhesive)

Ardex S21 extended information

COVERAGE:

Approximately 1.8kg of powder/m2/mm – i.e. a 22kg bag is sufficient for fixing approx. 21/2m2 of tiles with a bed thickness of 5mm and approximately 4m2 of tiles with a bed thickness of 3mm.

Surface Preparation

ARDEX S21 adheres to dry or moist sub-floors, such as cement and sand or concrete screeds, providing they are sound, clean and free of dust, dirt, oil, grease and other barriers to adhesion, concrete surfaces will require mechanical preparation to reveal the aggregate. NOTE: The requirements given in BS 5385 : Part 3 regarding the age of backgrounds prior to tiling/levelling/forming falls. Dense, smooth and impervious surfaces, e.g. terrazzo, can be primed with ARDEX P 82 or ARDEX P 4 prior to fixing tiles in ARDEX S 21, however in wet or external locations fix directly to the cleaned impervious surface using ARDEX S 21 with ARDEX E 90.

MIXING

ARDEX S 21 powder is added to clean water in a clean container whilst stirring and mixed thoroughly to give an easily worked mortar. The use of an ARDEX mixing paddle or other cage type mixing paddle with a 10mm chuck, variable speed electric drill makes light work of mixing

The mix proportions by volume are:-

Approximately 41/2 parts ARDEX S 21 powder:
1 part water.
A 22kg bag requires approximately 31/2 litres of clean water.

The mortar is immediately ready for use and has a

THICKNESS

Floor tiles can be bedded in ARDEX S 21 mortar, minimum bed thickness 2 to 3mm, the bed thickness being determined by the size of the notched trowel used.

APPLICATION

Bedding Technique. The workability of the ARDEX S21 allows the tiles to be fixed in a single operation so that no voids are left beneath the tiles, eliminating the need for buttering. The mixed adhesive is applied to the prepared surface with a trowel and then combed through with a suitably sized square-toothed notched trowel in straight ribs to give a ribbed mortar bed. Due to its pourable consistency, the ribs will have slightly rounded profiles. ARDEX S 21 has an open time of not less than 10 minutes when tested in accordance with BS EN 12004. For optimum performance under typical UK site conditions tiles should be fixed within 10 minutes. When the mixed mortar begins to firm up the material must be discarded. Do not add more water after the initial set has occurred.

Levelling Sub-Floors and Forming Falls.

Where the cement and sand or concrete sub-floor requires pre-levelling, prior to fixing ceramic tiles waterproofing etc., the ARDEX S 21 mortar can be used, including sand/aggregate where necessary, to obtain the required levels. For applications up to 10mm thick ARDEX S21 can be used in its standard form. The ARDEX S 21 mortar should be mixed and applied to the prepared sub-floor and floated out to the required level. For applications between 10mm and 30mm, the mortar is mixed with1 part screeding sand (0-5mm) by volume to give a semi- dry consistency, using approximately 20kg of screeding sand per bag of ARDEX S21. With damp sand less mixing water should be used. No film of water should form on the surface of the fresh

mortar. Where the ARDEX S 21 has to be filled with screeding sand, a bonding coat of the unfilled ARDEX S 21 mortar should be applied immediately prior to applying the sand filled ARDEX S 21 mortar.Wood floating of the mortar can be carried out immediately. If the prepared surface is porous it can be dampened down with water prior to applying the above options. Where the base is dense, smooth and impervious the bonding coat should consist of ARDEX S21 with the addition of ARDEX E 90. The levelling bed should be allowed to set and harden prior to fixing the ceramic tiles etc.

GROUTING

Tiles fixed with ARDEX S 21 may be trafficked and grouted after three hours at 20°C.

PACKAGING

ARDEX S 21 is packed in paper sacks incorporating a polyethylene liner – net weight 22kg.

ARDEX S21 STORAGE AND SHELF LIFE

It must be stored in unopened packaging, clear of the ground in cool, dry conditions and protected from excessive draught. If stored correctly, the shelf life is 12 months from the date of the packaging.

NOTE: For the latest technical or health and safety data on this product, consult the current technical or health and safety datasheet online at www.ardex.co.uk

ARDEX S21 Technical  Data

Ardex S21 properties tested