How to install bath fan with no attic

Question Icon
Posted by: from Calgary
12/27/2013 at 11:35:52 PM

My house has no attic, just a flat roof above. Can I/how do I install a bath fan?

User Icon
Date/Time12/28/2013 at 11:33:26 PM

If your roof trusses run to the outside wall of your bathroom you have no problem what so ever. Simply cut the opening for the fan. Open up the ceiling 6"x6" at every roof truss leading to the wall you have power on.

Run 110 from a wall outlet to a new switch and box, or an existing switch in the room, if you don't mind the fan coming on every time you turn on the light. Run this up to the ceiling and through holes at every joist you have to run through to the location of the fan. If you are running with the joist then only cut a few holes that with allow you to pull the wire.

Now if you are running with the joist open up enough holes to give you access to run the exhaust vent out into the soffit at the side of the house. Then using a ladder install the vent cover on the exterior of the house after attaching the vent to the vent line. After removing insulation to run the vent, install new installation around it. And then tape vapour barrier back with Tuck tape prior to reinstalling the drywall.

Either install the vent aiming down in the soffit or straight out. It depends on the finish of the roof at that location. After connecting all the electrical runs, test the unit. Then pull your insulation back in place where you ran the wire. Tape plastic vapour barrier back at each opening, and then install the pieces of drywall you cut out. Tape and plaster. Prime and paint.

Your done!

User Icon
Istion in Calgary
Date/Time12/30/2013 at 3:17:52 AM

Thanks SO much!!

User Icon
Tory in Toronto
Date/Time1/2/2014 at 12:48:40 AM

Call some contractor and they can suggest you better.

Search the TrustedPros directory and discover the best contractors in your area.

Find your home service pro
Great renovations start with a great contractor.

Since 2004, TrustedPros has been helping homeowners find the right contractor for their home improvements and repairs.

Post Your Project

Within hours you'll be comparing offers from top-rated professionals. It's free to post and you're under no obligation to hire.

Trustedpros Inc. does not warrant the accuracy, completeness, safety, legality or usefulness of any Content, or Whether Content is Current and up-to-date, and TrustedPros Inc. Shall have no liability whatsoever with respect to your use or reliance upon any content or for content being removed or otherwise ceasing to be available. Please refer to the terms and conditions of use of this websites for more details.

It appears you may be located in the US

TrustedPros is designed to deliver results targeted to your location.

Get Free Estimates

Post your project and compare offers from top-rated pros.