When time approaches repair in the bathroom, or in the kitchen, or in any other room where replacement of floor or wall tiles is required, many think about it with real horror. Indeed, in this case, you will first have to dismantle the old coating, which means a lot of dust, dirt, broken tiles, noise, etc. But in some cases, you can do without such dismantling.
If the surface is covered with durable ceramics, it does not have any significant damage, chips, then as a base it can be considered a very good option. Moreover, some repair teams note that sometimes such a decision is dictated not only by considerations of saving money and time. If the tile needs to be knocked down from the walls, then the risk of their destruction is possible, for houses of old buildings this is extremely undesirable, as well as for interior partitions made of drywall. If you start knocking down tiles from the floor, then this can also break the screed.
How to start
If you decide to put a new tile on an old one, then such a foundation should first be carefully prepare, it is from this stage that the longevity of the new coating and its appearance. If the surface was not properly prepared, or no preparatory work was carried out at all, then over time the new tile can crack, loosen or fall out.
The surface should be carefully inspected for defects, including chips. If they are, it is quite possible that some structural loads acted on the structural elements of the building or the foundation is sagging. Each tile is carefully probed, try to sway each of them a little, if you find an element that is not simply fastening in place, mark it with a marker.
Tile joints are also carefully inspected if there are places where the grout is crumbling or falls out, it is deleted, because in the future in this place she is not able to provide quality clutch. Using the construction level, unevenness or blockages should be identified.
If the deviations are up to 3 mm, then they can be leveled with tile glue, otherwise you will either have to completely dismantle the old tiles, or level the walls with plastering.
It is justified to lay new tiles on the old only in those cases when the old coating is ideally at least 85%.
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