This Old House general contractor Tom Silva shows how to properly install a roof-mounted bath-fan vent. (See below for a shopping list and tools.)
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Tom helped a homeowner with a bathroom fan that was venting moist air into his attic. The fan’s vent was installed on the underside of a roof soffit, causing moist air to get sucked up into the attic, which was leading to mold and mildew problems. To correct the situation, Tom moved the vent onto the roof, being careful to flash it properly so there would be no leaks.
Shopping List for How to Vent a Bath Fan Through the Roof:
– insulated duct [https://amzn.to/2WiWlTj]
– vent hood [https://amzn.to/2K0zK7j]
– sheet metal sleeve [https://amzn.to/2VJQEtf]
– foil duct tape [https://amzn.to/2WmMFXW]
– nylon zip ties [https://amzn.to/2YS1Wh3]
– tri-polymer sealant [https://amzn.to/2VQJ4gc]
– 1¼-inch roofing nails [https://amzn.to/2wkNQZ2]
Tools List for How to Vent a Bath Fan Through the Roof:
– hammer [https://amzn.to/30EKJcE]
– utility knife [https://amzn.to/2X2eKk5]
– flat pry bar [https://amzn.to/2QnOzlo]
– drill/driver [https://amzn.to/2wezNV5] fitted with 4¼-inch-diameter
– hole saw [https://amzn.to/2VNilRN]
– crimping tool [https://amzn.to/2QmRlHV]
– aviation snips [https://amzn.to/30J7pIL]
– caulk gun [https://amzn.to/2X8l0XK]
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How to Vent a Bath Fan Through the Roof | This Old House
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Do these kind of roof vent work in an area that gets a lot of snow during winter? Thanks
What region are you in installing the insulated line ? And being is some homeowners think that you guys hold final authority concerning these types of things How many feet from the fan to the vent is it? Because if it's over 12 or a 24 foot run, condensation could build up in the line even if it is insulated, no? And how would a 3 foot run build condensation in a line that's not insulated? In new jersey?
One drawback is in northern climates when the roof is snow covered blocking the vent.
Awesome!!
What happens when there is a heavy snow?
Going to try this on a three story house. Wish me luck!
Is that the correct way to use those duct crimpers?😅
This video helped give me the confidence to install a new vent on my roof. Just got it in an hour ago.
My only wonder is how much wind this vent can handle.
Anybody know the brand or more info on the caulking hes using??
Ok nice job, BUT what happens in the wintertime when you get 6 inches of snow on your roof, and it covers the vent?
So put a hole in the roof instead of blocking a few of the soffit vents, got it, makes sense…
This fan works very well. https://www.youtube.com/post/Ugkx7yWIKcrbA9KMHkGSfcgxW2lsjHT6B8Sh I replaced my old fan as our radon levels began to spike. When I remove the old fan water poured out of the fan. Must have entered in through the out spout. Replaced with this unit and levels dropped a bit but still over 4.0.Did some more digging and found that we had a small hole under our waste pipe that was allowing some water and radon in.Patched the hole and the levels dropped almost overnight.I really would recommend the radon sensor. It gives real time readings. Without it we would have never known that we had this issue.
Why wouldn’t he go out the side of the house, just not near a soffit
My upstairs bath just has a window, but the bigger problem is the downstairs bath fan vents into the second floor joist space! Ive got to figure out how to run a duct to the nearest wall, then up a flight into an inaccessible attic, and THEN to a dormer roof. Oh, wait, I just had an idea. If the joists run the right way, I can come out in the closet of the adjacent bedroom and then through the gambrel roof. There is no attic there. Cross fingers on the joist layout. Anyway, this video is very helpful.
Like the tip about cutting nail tabs in the collar. 🫡
I have a new build, 2019 home, guess where they vented it…..
The soffit.
Had my entire roof replaced a few years back and I'm dumbfounded to discover when replacing the exhaust fans in my bathrooms that the contractor never bothered to connect the ducts! Now I have to climb up there and do it myself. Lord give me strength fixing other people's laziness throughout the years.
Such a gorgeous book – each shed is unique and inspiring, and I love all the tiny details Kotite features to help readers imagine how to create their own She Sheds https://www.youtube.com/post/Ugkxe9yi0sulKgsp0VJJCIrLWWkvVqcU7LFR . The feature on Dinah's Rustic Retreat is like something from a fairy tale. It's really inspiring to see how creative all these ordinary people are in making beautiful and useful spaces on a modest scale.
When you live in the Carolinas and humidity is constantly high with thunderstorms in summer, I doubt soffit venting is going to be a real concern when your roof is sucking in hot moist air basically every day.
May 2023 and this video helped me turn my unvented bathroom into a properly vented one!