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I seem to have a leak in the wall. I don't think it's plumbing related because it just seems to appear during rainy days. Is there anything I can do before more damage occurs? Unfortunately it's going to be a rainy week here and these are crazy times given COVID-19 status. Many thanks in advance.

EDIT: More details: leak is on an East-facing 1st FL wall. No visible signs of leak on 2nd or 3rd floors. Asked neighbor, he denied any leaks. Wall is shared with another house (row-home style, adjacent house on east wall and west wall). Roof inspection two months ago didn't reveal any issues (purchased house a month ago). Roof pictures below, it looks like the leak location coincides with the neighbor's chimeny.

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    What is above the wall? What is on the other side of the wall?
    – DMoore
    Mar 23 '20 at 16:24
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    @DMoore: On the other side of the wall is another attached home (attached row homes style), and above the wall is another room. None of the rooms above seem to be having any leaks or signs of it.
    – David
    Mar 23 '20 at 16:27
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    So this is an inside wall of a multifamily structure and it has another floor above it. 99% chance if those are true that this is a plumbing issue. I am guessing there is a bathroom on the other side above, for your neighbor - that is usually how the layouts work for row homes.
    – DMoore
    Mar 23 '20 at 16:35
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    Well you have a really odd issue if there is no bathroom or kitchen above you. That is actually bad news. Now you have to track down how the leak got to your first floor. I find it very very hard to believe that a shared wall doesn't have plumbing in it for a bathroom or kitchen. It would be very very odd for this leak be a leak in the roof but it can happen. Do you have pictures of your roofline?
    – DMoore
    Mar 23 '20 at 17:04
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    This stinks a common wall for several floors above , may be worth renting a thermal camera to see if you can track the leak without opening the walls , since it occurs with rain it could be coming from the roof and finds its way inside at this location dribbling down the walls. I have a FLIR one pro I use with my I phone , I have the older FLIR one and they are great for tracking heat or cold through walls, I mostly use mine for electrical but tracking a leak that was on a roof a long way horizontally from where the leak showed up I use this right away now, the water shows as cold streaks.
    – Ed Beal
    Mar 23 '20 at 17:18

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