What kind of issues did you have with the foundation?
There’s many individual damage symptoms, but typically humidity somehow enters through the walls of the basement, making them damp/wet and thereby leading to mould infestation.
The expensive but thorough solution is to dig around the foundation and install a vertical damp-proof course around the outside walls. The walls would additionally require drying and depending on building material removing the old plaster and re-plastering.
If a concrete floor is damp, the culprit would be a crack which can be sealed with special injected sealants.
If it’s an older type of floor, it may need to be replaced with concrete.
How did the basement infest the rest of the house, just regular air transfer or did humidity rise through the walls and caused infestation in the above-ground rooms?
There’s many individual damage symptoms, but typically humidity somehow enters through the walls of the basement, making them damp/wet and thereby leading to mould infestation.
The expensive but thorough solution is to dig around the foundation and install a vertical damp-proof course around the outside walls. The walls would additionally require drying and depending on building material removing the old plaster and re-plastering.
If a concrete floor is damp, the culprit would be a crack which can be sealed with special injected sealants. If it’s an older type of floor, it may need to be replaced with concrete.
How did the basement infest the rest of the house, just regular air transfer or did humidity rise through the walls and caused infestation in the above-ground rooms?