Wrap the joints with duct tape.
Installing exhaust fan in bathroom through roof.
Access the attic and bring your light cordless drill screws and bathroom fan housing.
Attach the bathroom fan to the joist.
Cut a piece of drywall to make the ceiling hole the right size for your fan.
From up on the roof use a jigsaw or reciprocating saw to cut a 4 in.
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Start in the attic and drill a hole through the roof in the desired vent location.
Try to keep it close to the fan location.
If the hole is too big you ll need to patch the ceiling.
Attach the drywall filler to a larger piece of wood set it in the hole and drive screws through the ceiling into the wood.
You will need a partner for this step as you cannot see the ceiling from this position.
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.
Slide clamps over the flexible duct at both the roof cap and the fan housing then slip the clamps over the tailpieces.