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Roof valley is leaking, are these shingles cut right?

Posted by zirconx (My Page) on
Sun, Jul 11, 10 at 13:26

My 10 year old roof started leaking at one of the valleys today. It might have been leaking for a while but has never been so bad that we've noticed it. Today we got a hard, windy rain and water came through to the kitchen ceiling.

After reading about valley leaks, I understand the shingles need to be cut properly for everything to work right? All I read is a description, no pictures so I'm still not sure how they are supposed to be cut. I took some pictures, can anyone tell me if I'm correct with my assumptions?

I think this is how they are supposed to look, right?
http://img180.imageshack.us/img180/8194/shinglecutcorrect.jpg
I didn't find many that look like that.

Most are like this:
http://img801.imageshack.us/img801/1508/shinglecutwrong1.jpg
http://img706.imageshack.us/img706/7971/shinglecutwrong2.jpg

Could this be the reason for my leak?


Follow-Up Postings:

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RE: Roof valley is leaking, are these shingles cut right?

You have a cut vslley and not a woven valley.

Cuts are more vulnerable to leaks.

In the woven the shingles continue all the way across the valley.

The cut could be a little narrower, but without a scale i the pictures it is hard to tell.

You might want to get some tar and stick down the edges a little better.


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RE: Roof valley is leaking, are these shingles cut right?

Thanks. I found a staple under a shingle that looked a little loose, so I tarred it and nailed it back down, and tarred some of the other shingles, too. Hopefully this will help.


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RE: Roof valley is leaking, are these shingles cut right?

You might try backing up a bit when you take a photo.


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RE: Roof valley is leaking, are these shingles cut right?

In your "shinglecutwrong1" photo, we'll cut that little triangle off. Removing those triangles is called "dubbing". Those pointy ends can help channel water further away from the open valley.

Not sure if this link I'm adding will lead to just the pdf, or if it will lead to the specific page. Regardless, check out page 64 of this.


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