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Old 03-20-2013, 01:01 AM   #1
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Range Hood Exhaust roof vent cap


I'm going to install a new vent cap on the roof for a range hood. It's a standard asphalt shingle roof and I know that I need to properly layer the shingles and the integrated vent cap flashing with the flashing tucked under the shingles on the high side and above the shingles on the low side. Where I am still confused is with the question of any sealant. I have seen conflicting advice both on boards and on manufacturer instructions regarding this question. Should any sealant be used or not and if so what kind of sealant and where to use it?

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Old 03-20-2013, 05:40 AM   #2
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Range Hood Exhaust roof vent cap


I've never used any and never had a leak, but if it makes you feel better apply it under the flange on the vent and on top of the nail heads.
Should look like this when done.
http://www.bing.com/images/search?q=...electedIndex=9

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Old 03-20-2013, 06:05 AM   #3
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I've never seen a use for a sealant either.

Large vent; http://www.albertsroofing.com/Power%...stallation.htm

Picture of an original No caulk collar. The shingle under the collar goes up to the top of the hole, or above in the case of small collars. This one was installed in 1951 and no caulk is used anywhere. It's still good, though rusted on top now.
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Old 03-20-2013, 06:19 AM   #4
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The only thing I use sealant fir is to "glue" a course of shingles over the lower flange of the flashing so none of the flashing is visible. If you rely on sealant to prevent leaks, you're going to be in trouble when the sealant dries and cracks.
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Old 03-20-2013, 06:36 AM   #5
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Installed right the lower edge of the flange needs to be on top of the shingles and be visable, not under the shingles.
Sure way to direct water under the shingles.
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Old 03-20-2013, 06:41 AM   #6
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Quote:
Originally Posted by joecaption View Post
Installed right the lower edge of the flange needs to be on top of the shingles and be visable, not under the shingles.
Sure way to direct water under the shingles.
Joe,
I put the flashing over the shingles of course, but I also add a course over the flashing so none of the flashing is visible. The top shingle is a false course placed there strictly for cosmetics. I don't like the looks of flashing on a roof.
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Old 03-20-2013, 06:47 AM   #7
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Quote:
Originally Posted by joecaption View Post
Installed right the lower edge of the flange needs to be on top of the shingles and be visable, not under the shingles.
Sure way to direct water under the shingles.
I fail roofs done this way on inspection, unless I can cut the crap off without damaging anything.
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Old 03-20-2013, 06:48 AM   #8
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Quote:
Originally Posted by Davejss View Post
Joe,
I put the flashing over the shingles of course, but I also add a course over the flashing so none of the flashing is visible. The top shingle is a false course placed there strictly for cosmetics. I don't like the looks of flashing on a roof.
Why try to complicate something as simple as a pipe collar?
Flashing is supposed to be visible. A pipe coller is flashing/terination flashing in a single piece.

Last edited by tinner666; 03-20-2013 at 06:54 AM.
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Old 03-20-2013, 09:06 AM   #9
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Range Hood Exhaust roof vent cap


Quote:
Originally Posted by tinner666 View Post
I've never seen a use for a sealant either.

Large vent; http://www.albertsroofing.com/Power%...stallation.htm

Picture of an original No caulk collar. The shingle under the collar goes up to the top of the hole, or above in the case of small collars. This one was installed in 1951 and no caulk is used anywhere. It's still good, though rusted on top now.
Thanks Tinner, I havent seen asbestos roof tiles in a while, and wanted a picture of them.

A correctly installed stack flashing does not require mastic.
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Old 03-20-2013, 10:38 AM   #10
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Thank you all for the comments. Regarding selecting a good vent cap, is there a minimum width the flashing should be that sticks under the shingles? The caps at big box stores look very cheap and seem to have scary narrow flashing. Where can I find quality units, have had no luck locally at both pro plumbing and construction suppliers.
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Old 03-20-2013, 10:42 AM   #11
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I've been using those box store vents for many many years and never had one leak yet.
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Old 03-20-2013, 10:51 AM   #12
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Check out an HVAC supply and ask for a tall cone flashing. Good roofing supplies may have them also. Where are you located? Passaic Roofing and sheet metal in NJ has any damn thing you can think of relating to roofing, and I mean anything. I did a standing seam copper project in 1986 for a major client and had to hire union tin knockers. At the time they had to use charcoal pots (By Union Rules) for heating their tinning irons. Damn if PRSM didnt have them.
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Old 03-20-2013, 10:57 AM   #13
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Thanks. I am in SF Bay area.
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Old 03-20-2013, 11:21 AM   #14
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HVAC Supply. Tall cone flashing. Don't forget the counter flashing.

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