Use an extra long 3 8 inch diameter spade bit to bore a reference hole through the ceiling and into the attic.
How to install a roof vent for bathroom fan.
Slide the vent under the shingles so they cover the top half of the vent flange.
Choosing a whole house fan.
Nail the lower corners with roofing nails and tar the heads.
To install a roof vent start by choosing a good location from inside the attic and then pound a nail all the way through the roof at that location so you can find the spot from outside.
Center the nail between two rafters.
Remove the tape from the fan first.
From inside the attic drive a nail through the roof directly above the bathroom vent fan.
From the roof find the nail and use the utility knife to cut roof shingles from around the nail.
This way we can make sure both are positioned properly.
This video is a comprehensive rundown on how to install a roof vent on a pre existing shingle roof.
The lower half of the flange sits on top of the shingles.
In this video this old house general contractor tom silva shows how to properly install a roof mounted bath fan vent.
Next we must slip a worm drive metal clamp on the inside part of duct liner.
Climb into the attic and clear away any insulation from around the hole.
Draw a mark on the bathroom ceiling where you d like to install the vent fan.
Idea 5 connecting the duct to the bathroom fan.
Check the damper and the screen in prior to installation.
How to install a bathroom fan vent in the soffit.