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Old 10-11-2011, 10:12 AM   #1
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Leaking roof. Bad design? how to fix?


Hello, I have a freind that asked me to take a look at his roof because he has a signifigant leak in his garage. I am not a roofer, but I did work on a roofing crew for a few months, and have been in some sort of construction part time for the last, which is why he asked me. I looked at the roof, and from what I can see, the leak is a result of a bad design. The vally runs right into the house, and water is finding its way in. I guess I am curious about how to make sure this doesn't keep happening. I am afraid, if we simply tear up and replace what is there, it will eventually happen again. Here are some pics:


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Old 10-11-2011, 10:33 AM   #2
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Leaking roof. Bad design? how to fix?


Wow. I'm not an expert, but that sure as heck looks like intensely bad design. I suppose you can cover the whole area in ice and water shield at some point when redoing the roof (and some of the siding I guess too?) but who knows if that'd do it.

Please tell me you don't like in a cold, snowy area...

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Old 10-11-2011, 10:44 AM   #3
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Leaking roof. Bad design? how to fix?


Here's the details for a correct fix from Roofing Talk..http://www.roofingtalk.com/f8/i-forget-489/

You'll have to sign up as a roofer to see the pix, but it's very detailed.
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Old 10-11-2011, 10:46 AM   #4
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Leaking roof. Bad design? how to fix?


This one is in Hatteras, BTW. It's getting several inches of rain today and tomorrow.
I notice the corner boards are set differently from the one I did and yours. You'll have to kerf that outer corner board to run the flashing through it.

Last edited by tinner666; 10-11-2011 at 10:49 AM.
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Old 10-11-2011, 10:50 AM   #5
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Leaking roof. Bad design? how to fix?


Well, weird as it sounds, the homeowner might want to consider themselves lucky. I live in one of the snowiest, most ice-damn-prone parts of Canada, and that valley was scaring me into fits when I thought about what it would do in the winter. Perhaps North Carolina doesn't have roof membrane at all for valleys? It's pretty standard here.
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Old 10-11-2011, 10:51 AM   #6
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Leaking roof. Bad design? how to fix?


Quote:
Originally Posted by wilsonstark View Post
Well, weird as it sounds, the homeowner might want to consider themselves lucky. I live in one of the snowiest, most ice-damn-prone parts of Canada, and that valley was scaring me into fits when I thought about what it would do in the winter. Perhaps North Carolina doesn't have roof membrane at all for valleys? It's pretty standard here.
What do you mean by "roof membrane"?
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Old 10-11-2011, 11:01 AM   #7
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Leaking roof. Bad design? how to fix?


Oh, get rid of the 'W' valley. It's totally wrong for this application.
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Old 10-11-2011, 01:15 PM   #8
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Leaking roof. Bad design? how to fix?


Yikes, that's going to be rotten when you open it up. I'd add a cricket along the wall to change the slope and alter the path of the valley.
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Old 10-11-2011, 01:43 PM   #9
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Leaking roof. Bad design? how to fix?


This is in Minnesota...so, yeah, lots of snow and ice. I'll check out that link to the roofing talk forum. Thanks for that.
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Old 10-11-2011, 02:31 PM   #10
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Leaking roof. Bad design? how to fix?


In Minn., I'd run the I&W pretty high up the wall even If I built a cricket there. Crickets there bring on another, but similar set of 'rules' to keep it waterproof. First rulle would be to 'cant' it away from the wall. Second would be to create an exit in excess of 8" and carry the siding and trim across the face and under the cricket which requires some additional flashing on the 'lower' side.
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Old 10-12-2011, 07:55 AM   #11
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Leaking roof. Bad design? how to fix?


WoW. I am surprised it has not leaked buckets before.
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Old 10-12-2011, 09:05 AM   #12
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Leaking roof. Bad design? how to fix?


You need something like this chimney flashing



Copper would be my choice, but epdm, modified bitumen, or tpo would do. Just keep the shingles back as far as possible.
Run the copper/epdm etc. up the wall 8-12", depending on how much snow and ice sits in the valley . Keep the siding and corner trim up off the roof 4-6 inches.

Last edited by dmc@RCR; 10-12-2011 at 09:08 AM.
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Old 10-13-2011, 11:06 AM   #13
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Leaking roof. Bad design? how to fix?


Quote:
Originally Posted by tinner666

What do you mean by "roof membrane"?
Same thing as I&W.

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