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Old 10-05-2011, 03:07 PM   #1
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How would you vent this bathroom?


Not sure what section to put this in....

I am remodeling a small 5'x7' bathroom. The tub is against an outside wall. There was a window on that wall. I removed the window, with the intention of installing an exhaust fan. There is a 2x6 joist and a rim joist that I would have to cut through to vent the fan directly outside. The upstairs is finished, so I can't go up.

What would you do? Is it ok to cut a 4" hole in the joist? What is the smallest size exhaust pipe that will work for a vent fan? Should I just forget the fan and put a window in the shower?
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Old 10-05-2011, 04:04 PM   #2
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How would you vent this bathroom?


What if you were to lower a small section of ceiling so as to avoid cutting through a joist?

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Old 10-05-2011, 04:04 PM   #3
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How would you vent this bathroom?


Pop the dry wall/plaster off of that stair case---see if there is 4" of empty space below the floor joist--There is a very good chance--

NO---do not cut a 4" hole in those joists.---Mike----
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Old 10-05-2011, 09:31 PM   #4
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How would you vent this bathroom?


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What if you were to lower a small section of ceiling so as to avoid cutting through a joist?
I thought about that, but it is already so crowded in the shower area, I was hoping for a better way.
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Old 10-05-2011, 09:35 PM   #5
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How would you vent this bathroom?


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Pop the dry wall/plaster off of that stair case---see if there is 4" of empty space below the floor joist--There is a very good chance--

NO---do not cut a 4" hole in those joists.---Mike----
hey, howd you know it was a staircase? You been sneeking in my house?

I will check that tomorrow. Is it ok to mount a fan to the angled part of the ceiling?


Or, I could move the fan directly above the shower and not have to cut throught the joist, only the rim joist. Is rim joist even the correct term for that board on top of the top plate? Is it acceptable to cut through the rim joist?
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Old 10-06-2011, 10:27 AM   #6
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How would you vent this bathroom?


Unless you're going to use something other than the typical builder-grade fan, the duct will probably be 3", not 4". Still wouldn't cut the joist though. But you could maybe notch it a bit and be able to lower the ceiling a smaller amount. There are rules for notching joists so wait until some expert chimes in - I'm not one, at least not on that subject.

I most definitely would NOT put a window in the shower.

Last edited by md2lgyk; 10-06-2011 at 10:32 AM.
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Old 10-06-2011, 10:45 AM   #7
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How would you vent this bathroom?


How about a wall mounted fan. I have never actually seen one mounted on wall in person, but this seems like maybe the easiest way to go. Any opinions on these?
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Old 10-06-2011, 11:08 AM   #8
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How would you vent this bathroom?


Wall mounted fan would work--but the ones I've seen let in a lot of cold air----

If there is space for a duct under the lip of the staircase I'd mount the fan/light in the flat ceiling over the tub and snake the duct over--under the stairs and out---
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Old 10-06-2011, 12:32 PM   #9
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How would you vent this bathroom?


Why can't you run the ductwork through a joist bay to an exterior wall?
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Old 10-06-2011, 12:53 PM   #10
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How would you vent this bathroom?


Are you exterior walls 2x6? I've seen conditions where a traditional ceiling exhaust fan is actually mounted within the wall and the exhaust connected to an exterior exhaust shrowd with a backdraft damper (essentially a dryer vent). They are usually deeper than a 2x4, so a 2x6 would be great unless you have room to fur it out. I wouldn't mount it in an exterior wall as the insulation would be lost and the warm moist air within the fan would have an opportunity to condense and reak havoc.

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