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Old 11-28-2012, 03:26 PM   #16
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Is this vent going to be a leaker (pics)?


You know, I was just making this new picture because it was beginning to make more sense the more I thought about it, and then I saw that you replied already!




So you are basically tapering the tops of the shingles away from the hole which are hidden beneath the layer above. It's all making sense now So I definately need to recut that first course (red line) from the sounds of it, but should I taper cut the hidden part of the second one (green line) like this as well?

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Old 11-28-2012, 08:36 PM   #17
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Is this vent going to be a leaker (pics)?


First one gets tapered. The second one gets cut straight up.

The top of the first shingle is right in the water flow and needs a tapered cut so the water can't hit it's top and go off to the side.

The second one will be getting some sideways flow from the top of the vent curve and a straight cut keeps/guides the water down the roof.

I think you're getting it! Good show.
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Old 11-28-2012, 09:55 PM   #18
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Is this vent going to be a leaker (pics)?


Great, thanks for your help! I guess I know what I'll be doing this weekend. I just have to try and keep from further cracking the shingles when I take the nails out! At least the seals are broken already, so I've got that going for me.

Now if only they tapered the shingles in the video I watched... Haha, I should have learned by now that when attempting a project for the first time you should plan on doing it at least twice :-)
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Old 11-29-2012, 06:55 PM   #19
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Is this vent going to be a leaker (pics)?


I keep looking at this photo. You can start that vertical cut on the second shingle about 2" up and into the curve a bit if you want. That'll still give 5" of vertical cut surface to turn water the direction we want it to go which is straight down the roof.
Either way will be fine.
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Old 11-29-2012, 10:28 PM   #20
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Is this vent going to be a leaker (pics)?


Well, I was overly eager to get this done so I tackled it today instead of waiting for the weekend. I cut the first course like we talked about, and then the second just straight vertically with no curve at all. I just have two more questions that I thought about as I was finishing, and I circled them in this finished-product photo:







1.) First, the circled area on the bottom. That little bit of a shingle actually came completely detached when I made the taper cut . I probably could have done a better job keeping it in place as I was cutting, but also there wasn't much material to keep it there in the first place. I just applied a bit of sealant where it tore off, and some directly under it. I'm not sure how important that piece is, but I figured it doesn't hurt to have it there to keep the water going down, instead of over towards the edge of the flashing. Also, since I had the shingles off again, I applied a thick course of sealant along the vertical edges of the flashing before re-nailing. Would I be better off just pulling off that little piece all-together?

2.) Lastly, that other boxed area on the top is the cracking damage from the first time I took the shingles off. Breaking those seals was a lot harder than I thought, and that's exactly where they cracked. I also applied a good course of sealant along the original seal (which is also directly beneath the cracking) of every shingle I loosened. There's probably 5 where you can see the crack like in this photo. How bad is this, and how long can I get by with these before having to replace the cracked ones?
Thanks!
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Old 11-30-2012, 09:28 AM   #21
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Is this vent going to be a leaker (pics)?


To be honest, just tear it off. Water won't be any closer to the edge than it's already getting with the open keyway there any way. No biggie. Scrape off that bit of caulk too.
Not sure how long they will last. I'd just change them out at your convenience. They won't leak next month for instance.

When they're tightly sealed, I sometimes take a round nosed trowel and warm it with my propane plumber's torch. Then, just carefully slide it between the shingles. It'll cut like a knife in butter, so if you cut into any shingle, you have to replace it too.

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