Mould in solid brick house - should air brick solve the problem?

External corners are commonly an area where mould growth can occur as they are one of the coldest parts of the building fabric and when warm internal air comes in contact with the walls it is cooled down to rapidly and condensation is formed. The key is ventilation so an air brick will help but may not solve the problem. Look at other things as well namely - if you have an upstairs bathroom make sure it has a good quality mechanical extractor fan and that it is used correctly, put the windows in the bedroom areas on the trickle vent setting, move furniture away from the wall / corners so ensure air flow, and try to maintain the building at a constant temperature. Regards David

Lot of different things that could be causing this, leaking gutter, eroded gutter felt, re-pointed walls using a cement pointing, to name but a few. Would need to view the issue to see exactly what is causing your problem, installing an air brick will not work. Good luck Alex