that one should not take a shower right on the tiles

I’ve heard that one should not take a shower right on the tiles. Is it true or is it just a myth? Or why or why not?

Must be the case, use any special materials?

It is only to shower right on the tiles. The assumption is that the floor is documented dense, ie the membrane layer is placed below or above the screed. Floor tiles should have a max of 10% water pick when they are placed on a floor without heating or you have added cables with cover 3-5 cm. Have the other hand, low profile heating system (cover max 1 cm) should be the absorption max 6%.

Wall tiles can dermot have a water pick up 20%. This will be the store where you buy tiles explain markings found on the carton. Also remember that the tiles must have full indenting so that shower water collecting under the limrillene and eventually causes problems (odors, tiles coming loose, etc.)