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-   -   Leaking roof. Bad design? how to fix? (http://www.diychatroom.com/f9/leaking-roof-bad-design-how-fix-119795/)

aaronmarkson 10-11-2011 10:12 AM

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:
http://dl.dropbox.com/u/3463811/jones_roof2.jpg
http://dl.dropbox.com/u/3463811/jones_roof3.jpg

wilsonstark 10-11-2011 10:33 AM

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...

tinner666 10-11-2011 10:44 AM

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.

tinner666 10-11-2011 10:46 AM

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.

wilsonstark 10-11-2011 10:50 AM

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.

tinner666 10-11-2011 10:51 AM

Quote:

Originally Posted by wilsonstark (Post 746529)
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"?

tinner666 10-11-2011 11:01 AM

Oh, get rid of the 'W' valley. It's totally wrong for this application.

shazapple 10-11-2011 01:15 PM

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.

aaronmarkson 10-11-2011 01:43 PM

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.

tinner666 10-11-2011 02:31 PM

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.

Windows on Wash 10-12-2011 07:55 AM

WoW. I am surprised it has not leaked buckets before.

dmc@RCR 10-12-2011 09:05 AM

You need something like this chimney flashing

http://www.chimneyflashing.info/comp...1935994825.jpg

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.

wilsonstark 10-13-2011 11:06 AM

Quote:

Originally Posted by tinner666

What do you mean by "roof membrane"?

Same thing as I&W.


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