Hi, I have bad damp/black mold in my bedrooms. I ventilate the room every day and use a dehumidifier in for 2 hours in the morning and evening. I have air vents in my roof, vented sofits, new fascias and good eaves with EPS installed. The render on the house was done by the previous owners back in 1985. The gable end has a (Y) shaped surface crack. Do you think the mold & damp is due to condensation not breathing through the render? I would like to remove all the render and replace with a new render. One plasterer said that this doesn't need doing, and another said it did! Is it possible that the render is retaining moisture which is causing the severe damp? Any advice will be welcomed, also advice on best the types of render will be welcomed. Thank you