Technical Data

Download Technical Data Sheet - Terra Stone Adhesive




for  Terra–Stone Slim Line Terrazzo Tiles

October 2021


1.         Laying Specifications

Lay tiles on a clean stable concrete or masonry substrate, using a non-marking rubber mallet to ensure tiles are laid evenly with the least lippage possible, using a quality guaranteed 18 hour set tile adhesive, (porcelain fast set tile adhesives are not to be used). New concrete slabs or screeds to which Terra-Stone tiles are to be laid must be adequately cured to prevent the transfer of any substrate shrinkage cracks to the tiles. The concrete slab must be at least 6 weeks old and any screeds must be at least 4 weeks old before being tiled. All external slabs are required to be adequately waterproofed. On suspended concrete slabs and externally in outdoor areas, use Terra-Stone Adhesive or Tal 18 hour or longer set guaranteed adhesive, with full bond replacement of all the mixing water. Before laying the tiles, the surface bed must be dampened. Ensure each tile is fully bedded and supported throughout, with at least 95% coverage of tile adhesive. A 15mm notched trowel must be used to spread the adhesive on the floor. Also apply a thin layer of adhesive on the entire underside/back of each tile, by buttering the adhesive on the back with the flat edge of the trowel. The tiles must then be laid down and firmly bedded into the adhesive, by standing on the tiles and thereafter, using a tiler’s mallet, to bed them firmly into the adhesive. This process ensures good contact between the tile adhesive and the tile, to ensure there are no voids. Lay tiles with a 5-8mm joint for the 600mm format. Tiles to be laid in a grid format. Grouting provides support to the tiles after laying and this should take place between 24 and 48 hours after laying. For walls composed of wood or dry walling, a suitable paste tile adhesive must be used. In outdoor areas, ensure the substrate and tiles are laid to a fall, to allow adequate drainage and prevent pooling of rainwater, which could cause problems later.

2.         Grouting of Classic Polished, Lava Stone and Rustico Textured Tiles

Ensure after completing the tiling or grouting procedure, the tiles are left clean each day, wiping them clean with a damp sponge as the grouting progresses every 1-2m2. No tile adhesive or grout is to remain on the face of the tiles for more than half an hour prior to cleaning. UFT grey grout is the recommend- flooring grout.

3.         Expansion Joints

Allow movement joints against the perimeter walls of the area being tiled and on floors every 4,5LM or where there are existing construction or expansion joints in the substrate. On suspended floor slabs, expansion joints must be provided every 3LM. Flexible joint fillers must have no oil content, as the oil is absorbed into the tile, leaving unsightly dark edges.  An acrylic silicone is recommended with no oil content.  Where tiles are laid in a staggered bond system, this system should only be used internally, due to thermal stresses in the external environment and be sure to provide expansion joints in both directions.

4.         Tile Protection During Tiling and Construction

In a construction environment, cover the newly laid tiles with plastic or non-marking boarding until final handover, to avoid damage and soiling by following trades. Ensure red clay soil is not left on the tiles during construction as the fine clay particles may permeate the surface and stain the tiles. CAUTION: Acid based cleaners, thinners, strong ammonia cleaning chemicals and acetone should never be used on the tiles. Acidic cleaning chemicals will corrode the surface of the tiles, while ammonia and acetone will damage the protective sealant! Paint spillages should be avoided by covering the tiles with drop-sheets.  Wood sawdust left on the tiles, must also be avoided, as it may stain the tiles when damp, over a prolonged period.

5.         Sealing Procedure of the Tile


Once laid and grouted, an additional coat of “UFT Concrete & Stone Sealer” for the Rustico and Lava Stone ranges” is to be applied.  Ensure surface is clean and dry before sealing.


Two thin even coats of “UFT Concrete & Stone Sealer” is to be applied on the “Classic Polished” and “Mediterranean Handcrafted” patterned ranges with a clean lamb’s wool flat pad applicator, available from Union Tiles to ensure ease of maintenance, for both the tile and grouted areas after installation. Allow the first coat to dry before applying the second coat (±15min).  Tile surface is to be clean and dry prior to sealing. Thereafter, for high traffic areas, such as restaurants and shops etc... apply two thin coat of SQT Dresser, (a water based buffable and sacrificial surface sealer) on a clean dry tile surface and ensure to use a “clean lamb’s wool flat pad” applicator, to apply the sealer, available from Union Tiles.

6.         General Maintenance

On the Classic Polished, Mediterranean and Rustico ranges: For high traffic areas, such as restaurants and shopping malls. SQT Dresser is a “maintenance and sacrificial top dresser coat” and is to be applied only very occasionally, in isolated areas, where the sealants are showing signs of wear, however, it’s essential the surfaces are cleaned immediately prior to application, of any maintenance dresser coats. SQT Dresser can also be applied as a spray buff application on top of the Sealer. Where there are signs of wear, of the existing sealer. SQT Dresser will provide a buffable, protective coating filling any minor surface scratches, further enhancing the gloss finish, and prolonging the life of the sealants beneath and improving the stain resistance of the tile.

The SQT Dresser can also be easily stripped away by applying SQT Stripper during the cleaning process, should the dresser coating tarnish over time (±2-4 years). (SQT Stripper will strip the dresser, but not the protective sealer beneath).  Indoor areas need not be resealed again provided the top maintenance dresser coats are applied from time to time, depending on exposure to direct sunlight, and the extent of foot traffic in the area. Only neutral soap detergents should be used to clean and maintain the Terra-Stone tiles on a regular basis. SQT Natural Stone Detergent is the recommended cleaning and very effective degreasing neutral soap for these tiles.  Best cleaning results are in combination with a solution of SQT Natural Stone Detergent in warm water and a red 3M pad attached to a mechanical scrubber, and then the dirty cleaning water is to be removed with a wet and dry vacuum.  All cleaning machinery, sealers and soaps are available from Union Tiles.


A one-year product guarantee is supplied on our Terra-Stone Tiles provided all instructions and maintenance procedures are adhered to. The guarantee is strictly limited to the value of the Terrazzo tile product supplied and invoiced and does not include any
consequential or inconsequential damages for, labour materials or other costs.


Acid based cleaners, thinners, strong ammonia cleaning chemicals and acetone should never be used on the tiles. Acid cleaning chemicals will corrode the surface of the tiles, while ammonia and acetone will damage the protective sealant. Red clay soil must not be left on the tiles during construction, as the fine clay particles will penetrate and stain the tile. Paint spillages should be avoided by covering the tiles with drop sheets. Do not mix the tile batches in one area, always keep different batches in separate areas.