In order for the tiles to last for decades, the base for laying them must be very strong. The thickness of the plywood coating should be no less than four centimeters, and it should be moisture-resistant and impregnated with antiseptics to avoid rotting and swelling.To lay tiles on plywood, you should only use a special adhesive, which consists of two special components. It fastens the two surfaces very firmly, but not permanently. This allows the tile to move slightly on the surface of the plywood under load, which prevents it from falling off. Such compositions are available as ready-made mixtures, and in the form of powder, which will need to be dissolved in water. Before laying, you can order the installation or repair of metal windows. About the prices of these services can be found if you follow the link and read the contents of the site.
Plywood tends to absorb liquids, so it must be carefully primed more than once before applying glue. It is desirable to use a primer of the same manufacturer that manufactures the tile adhesive.
Adhesive powder is diluted in water in small portions, because it sets very quickly, within an hour. If you prepare too much of the solution at once, it will harden right in the container. Apply the composition on the plywood with a thin even layer and immediately attach the tile to it. Remove excess adhesive immediately, without waiting for it to dry out. Otherwise, it will be difficult to clean the tiles. Grout can be applied after an hour, and after three hours the tiled surface is ready for use.