Stopping leak between semi-attached roof shingle join

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Old 08-17-14, 07:57 PM
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Stopping leak between semi-attached roof shingle join

Hi All,

I have a leak in my roof which is coming from the region on my roof where my roof adjoins my neighbours (who i'm attached to / we share the same roof). It's been hard tracing this leak even though i know exactly where it's coming out in my attic (a crack in one of the planks of my roof).

Today i went up there with a hose and through various tests i found the leak flowed well when i flowed the water from my roof onto theirs. Causing, i assume, water to travel under the part of their roof that overlaps mine and then into some hole in my roof (a loose nail or crack?). I found that if i ran water off their roof onto mine a leak wasn't seen very much, but running it the opposite direction gave a good leak.

Anyway i need to seal this leak as i'm getting some new insulation done and don't want to ruin it.

What i'm thinking of doing is running a bead of roof caulking (the black tar stuff) down the overlapping portion of their roof on mine. I can't be exactly sure where water is making it under that overlap and into my roof so i figure it's best to seal it the whole way.

I did try to have a look under their roof but couldn't see an obvious hole. I guess i could look harder but i didn't want to pull up their roof too far in case i damaged it.

I know that sealing their roof like this could be risky as you're meant to allow a pathway for water to flow and sealing it like this might cause water to get stuck under their roof.

Should i not seal along the edge of their roof? Instead lifting their roof up to find where this leak is?

Thanks
oman
 
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Old 08-17-14, 08:23 PM
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Who did this roofing job?! I would hope no self respecting roofer would put his name on this. Shingles must be woven to the ones next to them. Is this a condo, apartment, duplex? Why was only 1/2 of the roof done?
 
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Old 08-17-14, 09:22 PM
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This is a 2 story house, split in two for two separate houses. Canadians call them semi-attached houses. I can't recall the US name. I've only just bought the house but my attached neighbour told me she did her roof 5or so years ago and offered the owner of my house to do their roof but they declined thinking it didn't need it (although i've found plenty of leaks).

What do you think my options are?
 
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Old 08-18-14, 03:35 AM
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Others may have better solutions, but I would have a competent roofer re roof your side and weave his shingles into your neighbor's.
 
 

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