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Old 10-26-2011, 09:23 PM   #31
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roof leaking 5 ft. below exhaust vent


It was built with shingles in 1993. The attic is only 4' tall in the center. If I wasn't so lazy, I would look up how to measure a pitch and then reply, but I can't change the pitch of my roof. I have 2 options. Remove the vent and shingle over the hole, or seal the vent up so it doesn't leak with sealants.

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Old 10-26-2011, 09:24 PM   #32
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roof leaking 5 ft. below exhaust vent


If it got caulk, it would first have to be shingled until the top of a shingle reached, or almost reached the top of the opening, then, 2 beads around the opening, then set the unit in the caulk. Shingle around it and DO NOT CAULK anything else! Leave 1/4"-3/8" gap between the shingles and the sides!
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Old 10-26-2011, 09:25 PM   #33
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roof leaking 5 ft. below exhaust vent


Oh!!!! Very inportant! If a shingle on top of it DOES NOT lay on the flange and PASS the top corner, it CANNOT be cut square! The top edge MUST be tapered to the outside of the flange.
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Old 10-26-2011, 09:26 PM   #34
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roof leaking 5 ft. below exhaust vent


The edges were left unsealed. Just a small gap between the shingles and the edge of the vent. The water was migrating sideways under the shingles instead of down.
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Old 10-26-2011, 09:27 PM   #35
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roof leaking 5 ft. below exhaust vent


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Oh!!!! Very inportant! If a shingle on top of it DOES NOT lay on the flange and PASS the top corner, it CANNOT be cut square! The top edge MUST be tapered to the outside of the flange.
I would like to see a picture or drawing of that.
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Old 10-26-2011, 09:32 PM   #36
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roof leaking 5 ft. below exhaust vent


Not a vent, but the technique is the same.
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roof leaking 5 ft. below exhaust vent-channel-flashing.jpg  
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Old 10-26-2011, 09:35 PM   #37
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roof leaking 5 ft. below exhaust vent


Pix would help.
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Old 10-26-2011, 09:38 PM   #38
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roof leaking 5 ft. below exhaust vent


Like this one?

This other pic shows what happens when the shingles are cut square beside walls, vents, etc.
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roof leaking 5 ft. below exhaust vent-tube-lites-2-.jpg   roof leaking 5 ft. below exhaust vent-resized-watertracks.jpg  
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Old 10-26-2011, 09:39 PM   #39
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roof leaking 5 ft. below exhaust vent


I'll get some tomorrow. I ran the hose on it tonight, actually, down the roof toward the vent. No leaks after 30 min, a new record. I'll see tomorrow, rain next 2 days.
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Old 10-27-2011, 09:58 AM   #40
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roof leaking 5 ft. below exhaust vent


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Using caulk around a vent ensures that water will enter and that it will leak. No 'roofer' would use caulk on it.
So are you saying roofer's don't follow simple instructions? The installation instruction *.pdf is on page 1 of this post and it clearly shows roof cement at the edges. Why am I not surprised at contractors jumping on me for doing thing's PER THE PLANS and not "that's how it's done".

I've installed multiple vents on my roofs with roofing cement and after 5 years, no leaks....

TO NOTE: Any roofing system should work great without caulk. Caulk should NEVER be the main source of water mitigation. But caulking, as a secondary measure is just safe practice, because the mounting flanges don't have lipped edges to ensure the water travels around and down the vent. The roof cement just helps to ensure the bulk water stays on top of the shingles...
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Old 10-27-2011, 10:00 AM   #41
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roof leaking 5 ft. below exhaust vent


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If it got caulk, it would first have to be shingled until the top of a shingle reached, or almost reached the top of the opening, then, 2 beads around the opening, then set the unit in the caulk. Shingle around it and DO NOT CAULK anything else! Leave 1/4"-3/8" gap between the shingles and the sides!
Again, read the installation instructions on page #1 of this post (Post #14 to be exact). yes, you DO CAULK the shingles to the side, but there is no need to caulk the unit to the deck.
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Old 10-27-2011, 01:15 PM   #42
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roof leaking 5 ft. below exhaust vent


Conducted a 30 minute leak test, no leaks. I guess following Broans instructions worked.
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Old 10-27-2011, 04:01 PM   #43
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roof leaking 5 ft. below exhaust vent


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So are you saying roofer's don't follow simple instructions? The installation instruction *.pdf is on page 1 of this post and it clearly shows roof cement at the edges. Why am I not surprised at contractors jumping on me for doing thing's PER THE PLANS and not "that's how it's done".

I've installed multiple vents on my roofs with roofing cement and after 5 years, no leaks....

TO NOTE: Any roofing system should work great without caulk. Caulk should NEVER be the main source of water mitigation. But caulking, as a secondary measure is just safe practice, because the mounting flanges don't have lipped edges to ensure the water travels around and down the vent. The roof cement just helps to ensure the bulk water stays on top of the shingles...
Interesting you should mention those instructions. I went back and read them. The brown vent in the pic I posted was done to those specs too. I fixed that issue. I redo 10-20 a year and they make me more profit than any other repair work I do.
SInce he said his was lo-slope, mayby I should have been more detailed in my explanation. You don't bed them in cement on lo-slope, 1-2 small beads under the flanges, 1" in and 1-1/2-2" in. Just as a backup. cement exposed to the weather, bonding 2 other dissimilar materials cracks all along the edges and water starts wicking in. SOmetimes so bad yu would think a garden hose was squirting water into the house.

I assume Broan is a major roofing company in the US, or even worldwide?
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Old 10-27-2011, 04:05 PM   #44
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roof leaking 5 ft. below exhaust vent


I'm guess they are not, however, I stated in my post that the cover was installed as you recommended in the first place, and it leaked. I don't know what the proper solution is. So what are you saying, to place sealant under between shingles and flange only but leave that exposed 90deg edge not filled in?
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Old 10-27-2011, 04:21 PM   #45
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roof leaking 5 ft. below exhaust vent


Quote:
Originally Posted by AGWhitehouse View Post
So are you saying roofer's don't follow simple instructions? The installation instruction *.pdf is on page 1 of this post and it clearly shows roof cement at the edges. Why am I not surprised at contractors jumping on me for doing thing's PER THE PLANS and not "that's how it's done".

I've installed multiple vents on my roofs with roofing cement and after 5 years, no leaks....

TO NOTE: Any roofing system should work great without caulk. Caulk should NEVER be the main source of water mitigation. But caulking, as a secondary measure is just safe practice, because the mounting flanges don't have lipped edges to ensure the water travels around and down the vent. The roof cement just helps to ensure the bulk water stays on top of the shingles...

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.

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