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Forum topic by Ben posted 10-10-2013 01:46 AM 829 views 0 times favorited 2 replies Add to Favorites Watch
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387 posts in 3058 days

10-10-2013 01:46 AM

I’m a carpenter and have run into a roofing situation that I need to fix tomorrow.
Basically there was a closed-cut valley with architectural shingles. Granular ice and water in the valley, felt paper elsewhere.

There was a vent pipe coming up right alongside the valley. HO wanted it moved. So I started taking it apart and realized that the shingles weren’t started in the valley and therefor the coverage was uneven, with some shingles only extending up the other slope 3” or so. Nails IN the valley, etc…

So I ripped up the whole valley and laid down Grace ice and water shield. (vent pipe was removed)

Since the shingles weren’t started in the valley, if I put it all back as it was the coverage will still be crappy.

I’m thinking about putting down a 24” roll of aluminum flashing, then filling it all back in and doing the closed cut valley again.

Alternatives are:

Exposed copper valley bent into a W – (too expensive for HO)
Ripping up the entire roof and starting the shingling in the valley with the closed cut.

Worth doing the aluminum, or would it need to be a heavier gauge?

Kind of stressing here as I need to finish this tomorrow before it rains.

Thanks guys.

2 replies so far

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893 posts in 2877 days

#1 posted 10-10-2013 01:30 PM

no takers on this one huh?

I have no idea without pictures. but my first thought is you have to match the other valleys right? so copper is out. What is aluminum flashing going to do for you that ice and water shield hasn’t already done? You’ll have to rework the pattern to get the overlap you want but you’re still going to end up with nails around 12” from the valley. I&W will seal around the nail. Aluminum flashing doesn’t.

roof caulk and walk…. KIS

View Ben's profile


387 posts in 3058 days

#2 posted 10-10-2013 11:17 PM

Thanks reedwood.
Finished the roof today.
I did put the 20” aluminum in the valley just as another layer of “make me feel better.” It also helps ease the bend. Wound up making some cuts in the field so that the coverage would be good in the valley. Came out just fine and it won’t leak.

Thanks again.

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