You will need a partner for this step as you cannot see the ceiling from this position.
Installing exhaust fan in bathroom through roof.
From up on the roof use a jigsaw or reciprocating saw to cut a 4 in.
Try to keep it close to the fan location.
Wrap the joints with duct tape.
The patched areas can be repaired with spackling later.
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If the hole is too big you ll need to patch the ceiling.
Start in the attic and drill a hole through the roof in the desired vent location.
Leave the drill bit sticking through the roof so you can find the hole.
This old house general contractor tom silva shows how to properly install a roof mounted bath fan vent.
Access the attic and bring your light cordless drill screws and bathroom fan housing.
Cut a piece of drywall to make the ceiling hole the right size for your fan.
Slide clamps over the flexible duct at both the roof cap and the fan housing then slip the clamps over the tailpieces.