Dene Workman
I agree with Chris
There is condensation appearing on the inside of a wall where there is
Posted by Michelle Smith, on
There is condensation appearing on the inside of a wall where there is a chimney on the outside. Flashing and tiles are intact.
Chris Plastow
This is because the chimney flue is not correctly ventilated. It causes ammonium sulphate contamination to surface inside. Vent the flue/ both flues and you might stop it. If the damage is done, waterproof render is required to the inside surface.
