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Old 10-27-2011, 05:25 PM   #46
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roof leaking 5 ft. below exhaust vent


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I've installed hundreds of these and possibly thousands of roof vents with no tar or roofing cement. Never had one leak yet. Those instructions are for people who walk into Menards to buy one and have never even seen one before.

Tell me how that is any different than a flashing on the wall or a roof vent. No one seals roof vents or flashing. It just creates problems.
My roofer installed mine. It leaked with no sealant. Can you explain that?

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Old 10-27-2011, 05:43 PM   #47
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roof leaking 5 ft. below exhaust vent


I still don't know what you have. It took me hours of searching to find these 3 pix of leaking vents.

And I found another like the one in Hatteras. They ran the shingle up past the corner, but then caulked the waterway closed. The water hit the top of the vent, then was forced under the shingles on each side. Leaked like a sieve.
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Old 10-27-2011, 05:44 PM   #48
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roof leaking 5 ft. below exhaust vent


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My roofer installed mine. It leaked with no sealant. Can you explain that?
Not much of a roofer would be my guess.
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Old 10-27-2011, 07:19 PM   #49
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roof leaking 5 ft. below exhaust vent


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Not much of a roofer would be my guess.
I hope that isn't your professional opinion.
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Old 10-27-2011, 07:58 PM   #50
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roof leaking 5 ft. below exhaust vent


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My roofer installed mine. It leaked with no sealant. Can you explain that?
Have any pictures yet?
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Old 10-27-2011, 08:02 PM   #51
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roof leaking 5 ft. below exhaust vent


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I hope that isn't your professional opinion.
As stated, just a guess. I'm in the dark as to his abilities. He could be great and had a brain fade. We all do at least once.
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Old 10-27-2011, 08:27 PM   #52
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roof leaking 5 ft. below exhaust vent


I won't have pics until the weekend. Too busy today and rain all day tomorrow.
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Old 10-27-2011, 09:17 PM   #53
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That is tar on that corner. The top shingle does go over the flashing and down the side. Edit: It's not really tar, it's some stuff called black lap. I looked it up, it's a valid product.

Last edited by Pirateghost; 10-27-2011 at 09:34 PM. Reason: Define
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Old 10-27-2011, 10:09 PM   #54
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roof leaking 5 ft. below exhaust vent


That vent landed at an awkward spot as far as the shingles lay goes.
The first shingle that lays on top of the flange ends right at that top corner. It's very easy for the water hitting the back of the unit to simply cross onto the top of that shingle let water in. There's usually some wiggle room. I'd tried to lower the vent an inch (A), or raise it an inch and have that particular shingle under it (B).

A vertical bead of caulk under each side about an inch would prevent any windblown rian from getting under it using plan B.

Remember this pic? See how the caulk shortcuts the water flow by directing the water under the shngle? Now picture the top of the shingle landing parallel with the vent top. Same thing. Water goes sideways in both cases.

Blakc lap sounds like EPDM seal, Geocel 4500, or similar.
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Old 10-27-2011, 10:13 PM   #55
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roof leaking 5 ft. below exhaust vent


Now, picture my vent pic with a 1/2"-3/4" channel there, and no caulk. The shingle literally seals itself to the vent and the water rushes unimpeded down the roof instead of searching for a path.
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Old 10-27-2011, 10:16 PM   #56
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roof leaking 5 ft. below exhaust vent


He swears by the black lap. Like I said, initially there was nothing along the edges, but it leaked. The shingles were not sealing themselves down to the flashing of the vent cover.
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Old 10-27-2011, 10:20 PM   #57
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roof leaking 5 ft. below exhaust vent


The 3"pipe opening is farther under and over to the side than it appears so the rule of 50/50 will apply to plan B, btw.

* RUle of 50/50--50% of the a vent flashing should be exposed on the lower half, the other 50% covered by the field material. ( Roofing 101)
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Old 10-27-2011, 10:21 PM   #58
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roof leaking 5 ft. below exhaust vent


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I still don't know what you have. It took me hours of searching to find these 3 pix of leaking vents.

And I found another like the one in Hatteras. They ran the shingle up past the corner, but then caulked the waterway closed. The water hit the top of the vent, then was forced under the shingles on each side. Leaked like a sieve.
What's up with that nail hole through the shingle into the flashing in the last pic?
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Old 10-27-2011, 10:27 PM   #59
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roof leaking 5 ft. below exhaust vent


I can't speak for the black lap. I'm not familiar with most caulk products, I use 10-12 tubes a year, maybe. And not on vents, just counterflashing where it's purpose is to fill in any voids in where metal to brick, or 'other' material meet each other.
I saw a pipe vent today that had 75% exposed, 25% covered with no signs of leakage.
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Old 10-27-2011, 10:28 PM   #60
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roof leaking 5 ft. below exhaust vent


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What's up with that nail hole through the shingle into the flashing in the last pic?
Just the kind of junk I spend my life fixing.

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