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Step-by-Step Instructions and Pictures of How to Run Duct Outside to Prevent Roof Rot

Improve bathroom air flow with a vent through the roof. Read an overview on how to repair a broken bathroom fan.

How to Run Duct Outside to Prevent Roof Rot-Step 1
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1. Slice out a 4-1/4 in. circle of shingles centered on the marker screw. Then drill a starter hole for your jigsaw blade and cut out the roof sheathing.

How to Run Duct Outside to Prevent Roof Rot-Step 2
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2. Notch out the upper layer of shingles to fit around the vent’s hood. Remove any nails that will stop the vent’s flange from slipping under the shingles.

How to Run Duct Outside to Prevent Roof Rot-Step 3
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3. Fasten a 6-in. length of duct to the roof sheathing with three screws. Seal around the duct with roof cement.

How to Run Duct Outside to Prevent Roof Rot-Step 4
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4. Slide the hood under the shingles. Cement the shingles to the vent’s flange. Fasten the lower edge of the flange with roofing nails.

How to Run Duct Outside to Prevent Roof Rot-Step 5
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5. Connect the flexible duct to the exhaust port with sheet metal screws. If the port and duct aren’t the same size, use an elbow and reducer.

How to Run Duct Outside to Prevent Roof Rot-Step 6
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6. Slip the insulation over the duct and secure it with a hose clamp. Connect and insulate the upper end of the duct the same way.

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