Bathroom Roof Venting


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Old 11-04-14, 03:27 PM
J
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Bathroom Roof Venting

After remodeling our kids bathroom, we decided to change the bathroom exhaust fan since it pulled little to no air. Our roof had been redone about 7 years ago and we had an bathroom roof vent installed. From the outside it looks like the typical broan square roof cap; however, in the inside we just have a square hole in the roof sheeting. No adapter to hook the ducting to. The current ducting is cheap plastic and is hung on a nail under the hole. Luckily we have no moisture issues. I would like to use rigid ducting to attach to the new fan to the vent, but I am at a loss at to the best way to do this.
 
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Old 11-04-14, 05:42 PM
J
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Need a picture.
So what's the issue. Remove the flex and add a solid pipe.
If there's no issue why are you changing it?
 
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Old 11-04-14, 06:02 PM
J
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Name:  bathroom vent.jpg
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Size:  7.5 KBI believe up the only reason we don't have moisture in the attic is that we weren't using the fan; just the window. We did have moisture problems in the bathroom which is why after the remodel we are putting in a new fan. Our old house had an adapter or pipe that came out of the roof cap to attach the pipe to. There is nothing there to attach a pipe to; just a hole. it must need to be sealed up some way. I am attaching a photo which looks very similar to our problem.
 

Last edited by JennF; 11-04-14 at 06:35 PM.
  #4  
Old 11-05-14, 01:42 AM
F
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Go to your local home improvement center and in the aisle with the duct work look for a starting collar like this:

[ATTACH=CONFIG]41207[/ATTACH]

Or this:

[ATTACH=CONFIG]41208[/ATTACH]
(Both images courtesy of Lowes, inc.)

that have the correct round size for the duct you will be using. If you are lucky you will find one that will also cover the entirety of that square hole in the roof. If not, then use either a piece of sheet metal or a square of plywood, thickness not critical, large enough to cover the roof opening with an overlap of an inch or two. After cutting a hole in the plywood or sheet metal fasten the duct starting collar to the flat material with some appropriate length sheet metal screws and using some sealant between the duct collar and the flat material. Then smear some sealant around the edge of the flat material and fasten it to the roof using short sheet metal screws that will not fully penetrate the roof deck, say 1/2 inch or so plus the thickness of the flat material.
 
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Old 11-05-14, 10:53 AM
J
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Thanks
I will go and look for the parts.
 
 

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