My English Site: Restoration of old buildings, conservation of monuments - Tips and Tricks 
Heating Costs Saving and Health Protection by the Interior Room Surface Heating System +++
Low-cost Repair, Renovation + Refurbishing of your old House 
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German version
Black mold in the bath 1: Plastified acidic coatings in the cooled window area offer best breeding ground for the
mould fungi. Just in contrast to alcalical lime whitewash. The shortly air changing after the showering cannot remove the surplus air
humidity. During and after the showering the damp - if not dried away through an opened window or by a
dehumidifier - will get into the cooled corner between the wall and the ceiling.