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Only get condensation when heating on in winter, when it's really cold/ frosty. Get black mold on window of unused room is I forget to have window slightly open. Recently found downstairs bathroom not insulated but now remedied, it was the worst. Other rooms about the same for humidity 58-70%...

We changed roof 5 yrs ago, no obvious leak from gutter

I've been in the house for 7 years, a victorian 1901 with cavity. We installed central heating have brown spotty walls upstairs. Have injected chemicals downstairs with chemicals. Around 7 courses spalled bricks above damp course down length of house. Walls are always cold. Humidity in house...