My bedroom's ceiling has been leaking (more like dripping) when it's raining or snow melting, and I highly doubt that the old TV satellite dish caused the roof leaking. (Pic 1)

What troubles me more is that I noticed there is another spot with thin horizontal lines on the ceiling and it’s right above where I usually sit and work. (Pic 2)

I have an inclined roof and the leaking spot is located slightly higher than pic 2's spot.

Can anyone tell me what might be the cause of this kind of line?

the dark spot is caused by my phone's camera

Leaking Spot

Another group of lines on ceiling

  • 1
    Water from leak running along (and through) joints in drywall (thus the lines.) The leak can be anywhere higher than the location of the leaking below - not often directly above, as if it runs sideways to find a weak point that's where it will pop out. Can easily travel 10's of feet along the bottom of a rafter.
    – Ecnerwal
    Mar 28, 2021 at 19:05
  • In the first picture, is that the ceiling on the left and walls on the right, looking into a corner? If not, I'm very confused by what I'm seeing there.
    – FreeMan
    Mar 30, 2021 at 12:07

1 Answer 1


Ecnerwal is spot on.

While you figure out how to fix this poke a few holes through the ceiling and place a bucket underneath so the water can get through. It may seem worse initially but remember the water has to go somewhere. If it isn't coming through the ceiling then it's soaking into the drywall and insulation and the extra weight might bring the entire ceiling down to say nothing of damaging even more.


  • Absolutely this as the first step. My in-laws had a leaking AC drain in the attic, and it slowly destroyed 10sqft of ceiling, which came crashing down in one lump in the middle of the night. No one had any idea it was pooling up there until that moment. Apr 1, 2021 at 15:30

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