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.
The lower half of the flange sits on top of the shingles.
Slide the vent under the shingles so they cover the top half of the vent flange.
In this video this old house general contractor tom silva shows how to properly install a roof mounted bath fan vent.
Choosing a whole house fan.
Climb into the attic and clear away any insulation from around the hole.
From inside the attic drive a nail through the roof directly above the bathroom vent fan.
Nail the lower corners with roofing nails and tar the heads.
Center the nail between two rafters.
Remove the tape from the fan first.
Check the damper and the screen in prior to installation.
Apply a bead of asphalt roof cement on the bottom of the vent.
This video is a comprehensive rundown on how to install a roof vent on a pre existing shingle roof.
How to install a bathroom fan vent in the soffit.
For optimum performance locate it between the shower and the toilet.
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This way we can make sure both are positioned properly.
From the roof find the nail and use the utility knife to cut roof shingles from around the nail.
Next we must slip a worm drive metal clamp on the inside part of duct liner.