Access the attic and bring your light cordless drill screws and bathroom fan housing.
Installing exhaust fan in bathroom through roof.
Attach the bathroom fan to the joist.
Try to keep it close to the fan location.
Cut a piece of drywall to make the ceiling hole the right size for your fan.
Place the fan in the cut out hole so that the bottom edge of the fan is flush with the bottom of the ceiling drywall.
The patched areas can be repaired with spackling later.
Attach the drywall filler to a larger piece of wood set it in the hole and drive screws through the ceiling into the wood.
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This old house general contractor tom silva shows how to properly install a roof mounted bath fan vent.
Wrap the joints with duct tape.
Slide clamps over the flexible duct at both the roof cap and the fan housing then slip the clamps over the tailpieces.
From up on the roof use a jigsaw or reciprocating saw to cut a 4 in.
You will need a partner for this step as you cannot see the ceiling from this position.