SikaCeram®-255 Big Slab

Improved deformable cementitious adhesive with reduced slip and extended open time classified C2TE S1 according to EN12004.

Portland cement, selected aggregates, water retention additives

9 months from date of production

If stored properly in original, unopened and undamaged sealed packaging, in dry and cool conditions.

Dmax : 0,42

~1.6 kg/l

± 6 mm (Big Slab adhesive)

+5 °C min. / +35 °C max.

(as per consistency requirement)

+5 °C min. / +35 °C max.

~3 min

~1 hour

24–36 hours

Curing Treatment

Protect from adverse weather conditions, such as extremely high or low (freezing) temperatures, rain, direct exposure to sun, for at least 12–24 hours from application.

~30 min (normal condition, interior)

Values determined at laboratory conditions: +23 °C ± 2 °C, R.H. 50 % ± 5 %.

Consumption is always dependent on the substrate surface profile and roughness, the size of the tiles and the joints between them, as well as on the application technique (single adhesive layer on the substrate, or with an additional ‘buttering’ layer on the back of the tiles). As a guide:

Note :

* Method : additional buttering, 2 sides application

** Method : single adhesive layer, 1 sides application

Pour the recommended amount of water into a suitable, clean mixing container. Whilst stirring slowly, slowly add the SikaCeram®-255 Big Slab powder to the water and then mix thoroughly using a low speed (~300-600 rpm) electric mixer until a completely homogeneous and lump-free mix is achieved.

After mixing, leave the material to stand and ‘mature’ for a few minutes, and then briefly stir again immediately prior to application. The resulting mix has a very creamy consistency and is easy to apply and spread.

• SikaCeram®-255 Big Slab is applied using a notched trowel.
• Apply sufficient product to ensure complete ‘wetting’ of the back of the tiles.
• Tiling must to be carried out on freshly applied adhesive, applying adequate pressure to ensure complete and uniform contact with the adhesive and thus optimum bond. If a film is seen to form on the surface, the adhesive has been left for too long; should this happen, then immediately remove the adhesive layer with the trowels, discard this material and apply a fresh layer of SikaCeram®-255 Big Slab adhesive.
• Avoid application in direct sunlight and/or strong wind / draughts.
• SikaCeram®-255 Big Slab is suitable for laying absorbent and non-absorbent tiles indoors without any size limits. Use support if necessary.
• To lay any tiles larger than 1500 cm² (e.g. 50 x 50 cm), the double-spreading (buttering) technique is always recommended.

Thoroughly clean all tools and equipments with clean water before the product has set, preferably immediately after use. Once hardened the product can only be removed by mechanical means.