Save time and hassle by following these simple instructions to install the mosaic.

  • General Conditions

    With any tile installation, you should begin by evaluating the site conditions, including temperature and humidity, substrate and waterproofing. For exterior installations, you should also consider the need for either partial or total covering. The substrate must be correctly aged; normal site practice suggested by adhesive manufacturers suggests waiting 28 days for the underlay and cement based plasters to set or 90 days for concrete. With anhydrite-based substrates, allow a maximum of 0.5% residual humidity.

    It is also important to take into account the possible effects of temperature on adhesives and materials. At temperatures below 10°C, proper drying of the adhesive will be considerably slowed and could create problems for bonding over the long term. At temperatures over 35°C, it is advisable to carry out the installation at a time of day where there is less sun, generally in the morning or late afternoon; also, shield the site from excessive sunlight during the hottest parts of the day, to prevent possible dehydration of the adhesive.

    It is equally necessary to consider the dehydrating effect of the prevailing wind, especially during the installation of exterior facades. In the case of swimming pools, it may be necessary to leak test the bonding in order to evaluate the behaviour of the underlying structure; while shower floors, whirlpools and jacuzzi tubs should be waterproofed with appropriate products. Before installation, all traces of dirt, grit and oil must be carefully eliminated and all loose parts and surface powder removed.

  • Technical instruments

    Before beginning, check that all the necessary instruments are clean and rust-free.

    · Angle grinder with crown diamond, continuous cutting disc. 

    · "Special" diamond disc for cutting agglomerate, diam. 110 mm. 

    · Measuring tape and pencil. 

    · String for marking main reference grid.
    · Mosaic pliers and cutter. 

    · Set of various-sized trowels and floats.
    · Toothed spreader, suitable for material/substance.

    · Rubber float for grouting and felt-backed float. 

    · Tray with roller and sponge for cleaning. 

    · Trend mosaic adhesive. 

    · Low speed drill with spiral mixer, so that adhesive properties remain consistent.

  • Substrate preparation

    The substrate must be compact and free of cracks. If there is a tendency to flake or if it is warped from shrinking, it will not provide adequate support for the installation, so correct rendering must be carried out first. This is also necessary where the base is not perfectly flat. With Trend adhesive, it is possible to produce rendering up to 5 mm thick to correct small defects in the substrate, although this operation must be carried out at least 24 hours before laying tiles. For rendering operations more than 5 mm thick, the use of specific white-coloured rendering products is advised.

    Unless otherwise specified by the customer, the mosaic is usually laid on white adhesive to avoid altering its colour. If the substrate is grey, especially dark grey, it is advisable to render it with white adhesive to standardise the colour of the background.

  • Preparing for installation

    Every installation begins with the unpacking of mosaics. It is advisable to verify the condition of each sheet of mosaic, before beginning to lay, and it is good practice to keep the material to be laid at the same temperature as the surroundings in which the work is being carried out. The starting point should then be identified and marked on the substrate, where the mosaic sheets are to be laid. Mark the guidelines at right angles to each other, corresponding to multiple sheets of mosaics, and it is customary to mark squares for 3 x 3 sheets. In the case of installing wall tiles, the guidelines must be both horizontal and vertical.

    Once the reference grid has been marked out, the adhesive is spread over the base. First use the smooth edge of the notched spreader to ensure that the whole surface is covered. Then remove excess adhesive using the notched edge of the spreader (3 mm square teeth), being careful to keep a steady inclination of the spreader and exerting sufficient pressure so that no more adhesive than necessary remains on the base.

  • Laying mosaic on Trend Plus

    Once the reference grid has been marked out and the adhesive spread over the base, start the installation by laying the mosaic sheets with the polyurethane Trend Plus mesh applied face down, without exerting too much pressure. Tap the mosaic with the rubber float to ensure perfect adhesion. During this operation you can correct any misalignment by lightly tapping the sheets sideways.

    The adhesive should not ooze from the joints. If this should happen, it means (1) that the notches on the spreader are too large, (2) that the base for laying is not perfectly flat and at some point there is excessive adhesive, or (3) that the notched spreader is being used incorrectly. During the installation, some manual manipulation on the sheets of mosaics may be necessary. When this is required, simply remove a single tile and substitute it with another, being careful to ensure that the adhesive is still workable. Once the adhesive is cured, you can proceed to the final grouting and cleaning.

  • Laying paper-mounted mosaic

    If the mosaic has been assembled using paper on its face, the paper should be facing the installer during the various phases of installation. It will facilitate installation if you examine the paper and note the small lines that should run in the same direction, positioned vertically in the case of walls. Pay special attention to the size of the joint between the mosaic tiles on the sheet, since the same distance should be maintained between sheets as they are installed. Once the sheets of tiles are installed, use the rubber float to tap the mosaic into the adhesive, then use the proper trowel to fully flatten the sheets.

    The removal of the paper is performed using warm water and a sponge. Repeat this gentle sponging process in the area you are working, until you can remove the paper easily; you can also use a steamer to facilitate this process. Work carefully, because at this stage the adhesive may still be relatively fresh. When removing the paper, pull diagonally from one top corner to the opposite bottom corner of the sheet. With the adhesive still somewhat fresh, you can adjust the grout lines and improve the visual impact of the finished project. Once the glue has hardened and before starting the grouting phase, it is important to clean the tiles to remove all residual glue.

  • Grouting and cleaning

    Do not compromise on the minimum times for allowing the adhesive to set, before grouting the joints; these times are typically 24 hours for vertical walls and 48 hours for floors, before allowing them to be walked on. Using a rubber float, spread the grouting cement with vertical and horizontal strokes, exerting a slight pressure to make sure the joints are well-filled. Pass the float diagonally to remove most of the excess filling.

    Surface cleaning can begin once the grouting cement starts to set; this time will vary according to the temperature of the surroundings, but will be between 30 and 60 minutes. Start cleaning using detergent diluted in water or Trend Clean cleaning fluid, passing several times in a circular motion over the tiles to emulsify the excess filler and smooth the joints. Specific high-dispersion polymers will ensure the removal of any excess grout.

    It is important to rinse frequently, always keep the water clean, and replace the sponge or felt when it becomes impregnated with plaster. Finish cleaning by wiping diagonally across the tiles to avoid disturbing the joints. Complete the job by drying the surface with a clean cloth to remove any water marks and remaining residue. Any hardened grout or stubborn adhesive can be removed with Trend Special Clean, following the on-pack instructions.

  • Technical information catalogue

    CLICK HERE to download "My Tech" the technical information catalogue.

Cleaning of the mosaic

To recommend daily cleaning neutral detergents in common use. Do not use wax, oil, hydrofluoric acid and phosphoric acid or products containing them. For extra cleaning

of limestone deposits, we recommend using a mild slightly acidic while in all other cases use a little basic products, in the manner and in the doses recommended...

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