bathroom venting to roof through inaccessible attic

Old 11-15-15, 11:27 AM
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bathroom venting to roof through inaccessible attic

The attic is webbed trusses and waist-deep blown-in insulation. The scuttle hole is at the opposite end of the attic. If I cut into the bathroom ceiling, the insulation will fall into the bathroom. I do not see a way to drill the siting hole into the roof, let alone run duct through the attic and box in for the fan in the bathroom.

If I vent to the soffit, I still have to go through the attic, and the soffit is vented, so I don't want to do that anyway. If I went through the wall, the vent would be right under the vented soffit.

I really don't see that clearing way in the attic is an option. Are there other ways to go?

Any ideas greatly appreciated.
Old 11-15-15, 03:22 PM
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We are missing a piece, of the story. What are you trying to vent? Is it the bathroom or an exhaust fan?
Old 11-15-15, 03:43 PM
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I've worked in some pretty tight spaces, but this sounds tough.
One option is to cut open the bathroom ceiling even more. This means a mess.
You can install the fan and duct work freely and then replace drywall and insulation.

A good patch job, float and texture ceiling, and you will never know ceiling was opened.
Old 11-15-15, 04:00 PM
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I've used those flexible vinyl Dryer Vent hose on some bathroom fans in the past;
even had one of the newer 100% aluminum ones pass inspection recently.

They'd be far easier to install than rigid ductwork in tight quarters.
Old 11-15-15, 04:07 PM
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Long term, one should have some form of access into and through the attic. If you had to call an electrician, he would not be as kind to that insulation as you. I have built several and recommended many raised walkways. You rake the insulation to both sides, build the raised walkway supports, fill under and cover with sheathing. Even 2' wide is a super highway compared to what you are looking at.

I don't recommend it, but if you have to go through the wall right under a soffit, just block that soffit area a couple of feet to each side. Hopefully the exhausted air will be blown beyond the eaves, but blocking some of it will ensure minimal moisture being pulled back into the attic.


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