How do you install a roof vent with an attached collar?
Roof vents with an attached collar look different from traditional styles, leaving people unsure whether they install the same way or if the collar will create a gap for water leaks. Manufacturers often provide only brochures without installation guides, making it difficult to figure out if these vents can be retrofitted or how they should be properly sealed.
What people tried
Every workaround mentioned in the threads below. We haven’t tested any of them — and nobody here is claiming they worked.
- 1Searching the manufacturer's website for documentation
- 2Installing the vent with the attached collar under shingles on the uphill side and over them on the downhill side, using roofing sealant under the lip
- 3relying solely on soffit vents without a top exhaust vent
In their words
Unedited, grouped by where they were said, most upvoted first within each place, each linked to the thread it came from.
“Is it possible to retrofit an attic vent into a roof like this?”source ↗
“Need to replace a cracked exterior roof vent used for a range hood. Local hardware only had vents with an attached collar? Does it get installed as normal?”source ↗
“I feel like this will just create a gap or separation for water to possibly get into if driving rain was forced back up the roof slope.”source ↗
“Canaplus website has no installation guides and only product brochures.”source ↗
Where this came up
People with this problem also raised
- 4Does the vent duct go inside or over the hood?
- 2How to add a vent when you can't reach the stack
- 2Landlord installed a dangerous makeshift furnace exhaust vent
- 2Roof vents installed off-center and poorly aligned
- 7No room to fit a plumbing vent in tight spaces
- 2How to vent a ceiling bathroom fan through a snowy roof