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Hello, The roof of my house is made of concrete tile (30 years). I am regularly contacted to have a maintenance done to eliminate mosses and lichens (practically nonexistent) and at the same time to waterproof the tiles with a waterproof and remineralizing product. Is this intervention necessary and effective?

Except accident or defective, the tiles are naturally waterproof for decades. Roofing treatments are only justified when tiles, often badly treated (by a too aggressive cleaning, for example with a high-pressure cleaner, especially when it comes to concrete tiles), have become porous, which results in humidification. from the underside of the tiles. If this is not the case, no need to do a "preventive" treatment.

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