To vent a bath fan through the roof you must first prepare a ductwork connecting the roof top to the bathroom.
How to install a bathroom roof vent.
On the bottom of the vent you need to spread some asphalt roof cement next.
Over there mount the vent hood using tri polymeric locking seal paste and put the nails to strengthen it.
Apply a bead of asphalt roof cement on the bottom of the vent.
Slide the vent under the shingles so they cover the top half of the vent flange.
Simply slide the vent under shingles to do so.
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Nail the lower corners with roofing nails and tar the heads.
Slide the top and sides of your vent underneath the surrounding shingles and leave the bottom side of the vent exposed and laying over the shingles.
Center the nail between two rafters.
For a fan and light switch with existing wiring splice the white wires and connect the grounds securely with wire.
Connect power to both switches through two pigtails spliced to the feed wire.
Climb into the attic and clear away any insulation from around the hole.
For optimum performance locate it between the shower and the toilet.
Use an extra long 3 8 inch diameter spade bit to bore a reference hole through the ceiling and into the attic.
The lower half of the flange sits on top of the shingles.
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Then drill a hole on the roof top.
The top half of vent flange needs to be covered.
From the roof find the nail and use the utility knife to cut roof shingles from around the nail.
Connect the red wire to one switch terminal and the black wire to the other terminal.
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From inside the attic drive a nail through the roof directly above the bathroom vent fan.