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My house, which is 30 years old, is covered with cement tiles. The tiles having lichen and foam, I had my roof treated by an antifoam, but before that, the roof was passed to the Karcher. The tiles are in good condition, but with what I read on the internet, I wonder about porosity in the future. It has rained since, many times, the tiles did not leak. What do you think?

If your roof has not leaked since cleaning: do not panic! It is true that high pressure cleaning is not recommended because poorly done it can cause many problems such as loss of waterproofing tiles, their offset, or even the takeoff of some joints around fireplaces or roof windows. During the next cleaning, prefer the application of an antifoam to the sprayer, possibly followed by a manual brushing to remove mosses and lichens, and a jet rinse.

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