Condensation
Condensation is the second most misdiagnosed form of damp after rising damp, condensation tends to be more of a problem during the colder winter months when the fabric of your house gets colder due to lower outside temperatures, condensation can easily been seen on windows but it also condenses on cold wall surfaces, but unlike glass windows, walls allow the water which forms from condensation to soak into the surface, this dampness along with the humid conditions of the air create the perfect environment for black mould to grow.
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Black mould spores are present everywhere just waiting for the right conditions to grow. Condensation is simply down to the lack of ventilation coupled with low temperatures, cast your mind back to your parents or grandparents houses, the often had open fireplaces, timber doors and windows and usually had draught excluders at the bottom doors, older houses were a lot more draughty which helped combat condensation due to ventilation.
Compare that to modern houses, for instance, double glazed windows and doors, fireplaces blocked up, cavity wall insulation and loft insulation installed to the max, properties nowadays are sealed up like ‘tupperware’ boxes, the moist air produced whilst, cooking, bathing, drying clothes etc, has no where to go and simply builds up and condenses on cold surfaces which in time will give way to black mould spores growing on the surface.