If the mould is making itself known with the initial black dots, it is important to act immediately. At this stage, the mycelium (i.e. the root system) has not yet penetrated deep into the elastic sealant. Regular cleaning of the sealant surface with Anti-Mould Spray can inhibit the spread of the mould, or eliminate it completely. Afterwards, the joint should be regularly inspected and maintained, this means keeping it clean and dry. Anti-Mould Spray is available from builders' merchants or from your tiler.
in its place
If the mould has spread too far in the silicone joint, you should absolutely contact a professional tradesperson. In such cases, repairs are generally required to the silicone joints in the bathroom. Here, the tiler or grouter will remove all silicone strips from the joints, i.e. also from the wall connection joints or the joints between tiles and bath or shower tray. The backfilling material (usually a back-up rod) underneath also has to come out, as there may be mould residues present here. The tradesperson will then disinfect all areas which may later come into contact with the back-up rod underneath the silicone compound or the silicone compound itself. The tile edges are also carefully cleaned before grouting so that the silicone can adhere perfectly. Before the actual grouting, the tradesperson will insert a back-up rod into the joint so that the joint silicone cannot sag downwards or backwards, thus avoiding what is known as three-point adhesion.
Ask the tradesperson to use OTTOSEAL® S 130 or S 140 with Fungitect® Silver Technology. This way, you'll be able to enjoy your repaired, mould-free bathroom for longer – provided you take proper and regular care of the joints.