Revisions log for Answer #1149
This is the answer to the question Why is there dampness on a wall covered with drywall? How to fix it?
Revision 1
The first reason is excessive humidity in the room. 40-60% is considered normal for humans. Anything above this value is harmful not only to the occupants, but also to the structures themselves. You can measure the humidity with a hygrometer. If the humidity is within normal limits, this is not the cause.
Not only humidity, uneven heating, but even the presence of an aquarium or a large number of potted flowers in the room can affect the appearance of mold.
What you need to do first is to ensure regular ventilation of the room, previously moving the furniture away from the problematic walls.
In your case, you will have to dismantle the drywall, remove mold with a stiff brush, clean the surface and then, treat the wall with a special antimold agent. You can use Domestos. Or you can buy the necessary products in a construction store.
A cleaned and treated wall must be dried thoroughly! A blowtorch can be used (just be careful not to start a fire) or a construction dryer.
The next step is to treat the wall with antifungal composition, antiseptic, or other means – now there is a very wide choice in stores.