We have a large circular staircase that is open from the main floor up to the 2nd floor. At the top of the 2nd floor directly above the stairs, a mysterious darkening has started to show up where each of the drywall screws are.
I am not sure if this is a mold issue where all the warm air is traveling up through this space, and then travelling through the screws to the outside (and condensation is causing screws to rust), or if this might be an issue where dampness is causing problems from up above.
If it were from up above, this area is very difficult to access, and I don't know how I would confirm this.
The 2nd story addition was added to the house 8 years ago, so I think that this might be a problem which has just now started to show itself after a few years of the issue being present.
Any ideas or suggestions?
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