How do I prepare the substrate?
Before you start work, carefully assess the type of substrate on which the tiles will be laid (plaster, marble, metal, wood, heating floor or other) and bear in mind that each of these surfaces needs suitable preparation. In general, the surface to be laid must be completely smooth, flat and regular as well as having had time to mature and become consistent and stable. If the area to be laid is made of metal or fibreglass, the surface must be slightly rough, flat and regular as well as being consistent and stable. If the area to be tiled is a heated floor, you must apply a reinforced flexible membrane of the same type as used for water-proofing.
How do I prepare the substrate for a swimming pool?
WE RECOMMEND THAT YOU DO A WATER-PROOFING TEST ON THE POOL BEFORE APPLYING THE COVERING. The substrates and walls must be suitably prepared, i.e. seasoned, fastened, consistent, have no removable components and be flat and tested with a plumb line. Any exposed metal components in the area to be covered must be smoothed with a flexible grinder and be treated with a suitable anti-rust product. Any wooden components on the walls must be removed. Any concrete rough edges or ridges must be smoothed with a flexible grinder. Any residue of cleaning products or similar must be removed with a flexible grinder and/or a degreasing product. Water proof the structure with suitable products. Before laying the tiles, carry out structure load test (filling). Skimming (whitened material on the surfaces) with Bisazza adhesives (AD HOC o EGLUE) gives you about 2 mm of play with the substrates. Use suitable skimmers in addition to the 2 mm ones. Remember that THIS TYPE OF SKIMMING IS NOT WATER PROOFING.
Where possible, spread all vertical and horizontal edges with a radius equal to or greater than 40 mm (if laying paper backed tiles) and 50 mm (with mesh backed tiles)*. The worksite must be protected from the sun and rain but even more important is to prevent water from lying on the tiled surfaces not yet grouted for at least 20 days after the last tile is laid. The temperature of the substrate must be kept at between +5° and +30°from the start of laying until at least 10 days after work has been completed.
*Example refers to 20x20 mm mosaic at a concave angle.
What products should I use to water proof the substrate?
Bisazza recommends B-DRY, a white dual component water proofing that has been specially designed to be perfectly compatible with Bisazza adhesives. Alternatively, we recommend cement based water proofing products.
How can I make the substrate whiter and smoother?
If the substrate is not perfectly smooth, uniform and white, use one or two skimming coats of AD HOC adhesive. These quantities have already been included in the calculation of materials consumed per square metre. If on the other hand you use EGLUE, you will have to separately calculate the amount needed for one or two skimming coats (900 gr per square metre for two skimming coats – about 2 mm; alternatively 1,400 gr per square metre if the skimming is performed with a mesh to reinforce the substrate).
How long do I have to wait before laying tiles with AD HOC?
Once the substrate has been skimmed to make it whiter and smoother, you must wait until the surface is dry before you start to lay tiles. The waiting period varies with the temperature and humidity in the area to be tiled.
Can I use expansion joints when tiling a swimming pool?
If the substrate has expansion joints, the same pattern must be followed using profiles or silicone which must perfectly match the joints below them. If you use profiles, make sure that they are resistant to water and to products used for keeping the water clean (316 stainless steel).