Technical Data

Terra – Stone Slim Line Terrazzo Tiles
Incorporating: delivery, care, installation and maintenance procedure for Terra Stone Tiles
Vol. 1 May 2018

On site delivery

Tiles should be handled with care, ensuring no damage to the corners etc. and are to be offloaded with a crane or forklift from the delivery vehicle. Tiles, if offloaded from the pallets, should be stacked on edge in a dry protected area and not in direct contact with soil.

Laying specifications

Tiles must be laid on a concrete or masonry substrate. For external application, screed the slab such that there are slight falls for easy drainage to prevent pooling of rain water after installation of the tiles. Ensure that the surface is clean, flat and firm.

Cement based ceramic tile adhesive e.g. (UNILOC contractors adhesive or similar) must be used. Important: Specialized quick setting porcelain tile adhesives are not recommended and may cause crazing of the tile.

The tile adhesive must be spread evenly using a notched adhesive trowel. Work over small areas so that the adhesive does not dry. Remove the excess adhesive using a damp sponge and wipe the surface clean frequently as the tiling work progresses, e.g. after every + 1-2 m2 tiled.

For outdoor or wet areas, or suspended floor slabs, use bonding liquid as a replacement of water for the tile adhesive and grout.  

Ensure each tile is fully bedded into the adhesive using a non-marking rubber mallet, and that all areas are supported throughout and ensuring there are no unsupported areas. Lay tiles with a 3-5mm joint for the 300x300mm format and 5-8mm joint for the 600x600mm and 800x800mm formats (Do not butt joint). Ensure a minimum of 95% of tile adhesive coverage beneath the tile. All corners and edges should be fully supported by the tile adhesive. Terrazzo tiles may vary slightly in thickness, therefore ensure that all four corners of the tiles on the surface are bedded level. (Set aside any defective tiles or tiles with unacceptable shading as no claims will be accepted after tiles have been laid)

Curing of the slab or screed prior to installation

New concrete slabs on 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.

Expansion joints

For large areas, expansion joints need to be created, to allow for structural movement every 4.5LM for ground floor slabs. For suspended floor slabs, provide for expansion joints every 3.5LM. The expansion joints must coincide with those in the structure beneath. Expansion joints are created by using a more flexible grout between tiles, use an acrylic based matching coloured silicon, with “no oil content” as the oil will be absorbed into the edges, causing dark unsightly edges. Ensure that there are expansion or movement joints around the perimeter walls as well.


Classic Polished, Lava Stone & Rustico finishes

Ensure after the grouting and tiling procedure, that the tiles are left clean each day, by wiping the excess grout or adhesive with a wet sponge as tiling progresses.
Important – No adhesive/grout is to remain on the face of the tile surface for more than + 30 minutes prior to cleaning.

Carpet Stone and Exposed Aggregate textured tiles.

Ensure that the tile joints are clean and have been dampened two or three hours prior to grouting. Mix the grout in small amounts using minimal water to an almost semi dry crumbly texture and use a trowel to work it in between the joints. Compress the grout into the joint using a round pointing or jointing trowel, leaving a smooth compressed joint finish. Excess grout must be brushed clean, removing excess grout between the aggregates in the tile, soon after grouting. Use a fine spray of water thereafter to moisten the grout, soon after installation, + 1 hour for best curing, on the same day as the grouting process.

Tile protection during tiling and construction

In a construction environment, cover the newly laid tiles with plastic or non-marking boarding until final hand over, in order to avoid damaging and soiling of the tiles by any site foot traffic and workmanship. Ensure red clay soil or saw dust is not left on tiles during construction.

Sealing procedure of the tile

Lava Stone, Carpet Stone and Rustico textures

Once laid and grouted, an additional coat of “SQT
Union Sealer” for Carpet Stone, Rustico and Lava
Stone ranges is to be applied. Tile surface is to be ‘’clean and dry’’ prior to sealing with an even thin coat using a clean lamb’s wool roller.

Trevisano, Grooved Mediterranean and Classic Polished range textures

Apply ‘’two thin coats of UFT Concrete and Stone Sealer’’ with a clean lamb’s wool roller, to ensure ease of maintenance, for both the tile and grouted areas after installation. The tile surface is to be clean and dry prior to sealing.

Top Dresser coat for high traffic areas

For high traffic areas such as restaurants and shopping malls, applying SQT Tile Dresser on top of the sealant, will provide a buffable sacrificial top coating. This prolongs the life of the sealants beneath and stain resistance of the tile. The SQT Tile Dresser can be maintained by using a trigger spray bottle and applying it to isolated worn high traffic areas. These areas can then be buffed using a white 3M pad, attached to a mechanical floor scrubber. Ensure areas being applied with SQT Dresser are clean and dry prior to application.

General Maintenance

Areas must be re-sealed, depending on exposure to sunlight and extent of foot traffic in the area. Only neutral soap detergents should be used to clean and maintain the tiles, we recommend the SQT Natural Stone detergent, available at Union Tiles. Dish Soap
or soaps containing ammonia or acid should not be used! In high foot traffic areas we recommend the use of a mechanical floor scrubber with a red 3M pad to maintain the floor with a solution of the SQT Natural Stone Detergent in warm water, followed by a wet and dry vacuum cleaner to remove the dirty water. After cleaning the floor and where required, due to possible wear of sealer coats, spray on SQT Dresser in small amounts and buff this onto the clean dry floor, to rebuild the sealer coats, and ensure a uniform appearance throughout. Use a soft 3M pad to buff the SQT Dresser attached to the base of the mechanized floor scrubber/buffing machine.


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.

Terra-Stone sizes:




Insitu Terrazzo Flooring - ScreedCrete

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