How does mould grow on concrete/brick walls? What does it feed on? There’s even a layer of paint on the walls that further prevents it from reaching any wood if there is behind the walls

Question

How does mould grow on concrete/brick walls? What does it feed on? There’s even a layer of paint on the walls that further prevents it from reaching any wood if there is behind the walls

In: 72

Answer 1

It likely feeds of residual bacteria, algae or organic material trapped in the concrete. When concrete becomes humid it might bring those things to the surface, allowing mold to hang on and grow, but only for so long.