Damp Proofing

Cause of black mould despite air bricks

Anonymous user 28/02/2024 - 2.58 PM

Hi, my house is quite old (1870), in the living room the wall beneath the window had damp a number of years ago. A damp proof course was done (injected something into walls / plaster taken off and redone), this solved the damp and the wall now feels warm and dry. There are three original air bricks in this wall, however right in front of two of the three air bricks, we are getting black mould. I am at a loss as damp proof plus air ventilation (the vents are clear) should prevent this. Our neighbour has relaid the drive and the drain away is not great as it does lead towards where we have the damp but the outside wall feels bone dry. We have a shelving unit and tv stand in this corner of the room and behind them and the curtain on that side of the window, the mould is still there (I have washed it off but the paper is discoloured - I don't think it has got any worse but it is still there). What could be the most likely cause and how can we prevent it? I have two small kids (1 and 2) and I am an asthmatic i am concerned the mould can't be good for any of us. Any advice much appreciated.