I currently own a two-story row home that is probably close to 100 years old and was last renovated 15-20 years ago.

My big problem right now is a leak that is coming in through the roof in the back corner of my house, dripping through the wall, and into a closet that is below the leak on the first floor. In the 8 months since I have moved in, this very small leak has caused the ceiling in the closet to cave in, the dry-wall beneath the leak to get wet and disintegrate, and various water stains all around the leak.

Now, it has taken some time and crafty problem-solving but I have located the exact spot of the leak from inside the house. I have done my best to extrapolate where it would be coming in from the outside and done my best to patch up that part of the roof. Well after countless rubber coats and roof sealant in the general area of the leak (I've covered about a 3 foot by 3 foot area in the back corner of the roof above the leak with roof patches), the water is still coming in. After more inspection here is what I think is happening. Whenever the roof was last redone, instead of removing the old roof and completely redoing it, they just put the new roofing on top of the old roof (I can see from the inside of the house when I lift up the drop ceiling panels that the old roofing material is still there). What has started to happen is that the two layers of roof have separated from each other in some spots, specifically directly above where the leak is.

So here is my theory: The roof is old and water is seeping through the top layer in different places throughout the roof (not necessarily directly above the leak and probably very small micro-cracks or holes). The water then seeps through the gap between the roof layers and gravity takes it down to the back corner where it eventually goes through the leak into the house.

My questions:

1) does this sound like a reasonable theory? I don't know the most about roofing but after racking my brain for months this is my best idea of what is happening and the only explanation for why my gratuitous roof patches have done nothing.

2) I know where the water is coming from the inside. If I seal up the leak from the inside, this will stop water from coming into the house but it doesn't stop the actual cause of the problem (water seeping through roof). Is this a bad idea? Will sealing the leak from the inside cause me more problems down the line?

To clarify, I don't need a permanent, professional fix. I need something that will get me by for the next 1-2 years as I intend to move within that time frame and this is what I think is the most reasonable fix given the situation. Please, if there is a better way to do this, I would love the input.

  • VTC - I'm voting to close this question as off-topic because, despite the demands made by the poster, this is about DIY Rental Repair and this site is about DIY Home Repair.
    – Michael Karas
    Mar 27, 2017 at 13:04
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    Nope, this is a bad idea. You never fix the roof from the inside, and worst case scenario, the water is re-routed by your "fix" somewhere else, like inside the wall, where it does extensive but hidden damage which will be blamed on you, because you fixed the roof incorrectly.
    – haimg
    Mar 27, 2017 at 13:10
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    @MichaelKaras and just what is the difference? I agree we wouldn't recommend a "1-year fix" to either an owner or renter, but that's not grounds to close. Mar 27, 2017 at 15:46
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    @MichaelKaras "...In the 8 months since I have moved in, ..." makes it sound like he's an owner/occupier, so well within bounds. Mar 27, 2017 at 19:57

1 Answer 1


You will save money by fixing the roof properly from the top-side.

A bottom up repair has almost no chance of working. On the contrary, it has a high probability of moving the leak to somewhere less visible, which has a high likelihood of causing expensive future damage. (Damage that's usually found in a home inspection prior to sale, which will either need remediation or reduced price. Don't even get me started on the damage to the future sale that occurs when the word 'mold' appears on an inspection report.)

  • thank you for your answer. this is what i had suspected but i just wanted to make sure before pursuing more professional fixes.
    – celeriko
    Mar 27, 2017 at 17:55

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