How to Remove and Replace Old Furnace Roof Venting

To maintain the effectiveness and safety of your heating system, it’s important to remove and replace any outdated furnace roof venting. Even though it could seem like a difficult chore, taking the proper safeguards and processes can help the process go more smoothly. We’ll walk you through the process of replacing the outdated furnace roof venting in this article, as well as provide advice on how to avoid further issues.

Removing Old Furnace Roof Venting

Gather Your Tools

• Ladder
• Pry bar
• Hammer
• Wood chisel
• Screwdriver or nut driver
• Gloves
• Safety glasses
• Dust mask

Turn Off Your Furnace

Before beginning, ensure your furnace is turned off for your safety.

Cut Through the Roof Mastic

• Use an extension ladder to reach the roof.
• Remove fasteners holding the rain cap in place.
• Use a screwdriver or nut driver to twist and remove the rain cap.
• Cut through the roof mastic around the pipe area using a wood chisel and hammer.

Put On Your Safety Gear

Don safety gear, including gloves and eye protection, and access your attic through the access panel or pull-down stairs.

Remove the Metal Straps

• Use a pry bar and hammer to remove the metal straps securing the vent pipe to the roof and ceiling framing.
• Pry the nails or screws loose and unwrap the straps from the vent pipe.

Lift the Upper Part of the Vent

• Lift the upper section of the vent and twist it to separate it from the lower portion.
• Use a hammer to tap the connection point if necessary.
• Lower the upper part until it is under the roof flashing.

Unfasten the Clamp

• With a screwdriver, unfasten the clamp where the vent attaches to the furnace.
• Drag the end of the pipe from the flange and use a hammer to dislodge it by tapping.
• Have someone stabilize the vent pipe below as you pull upward on it and lift the lower section into the attic.
• Remove both parts of the vent pipe from the attic.

Replacing Old Roof Venting

Get The Roof Ready

• Remove the old vent and any debris, cut away surrounding shingles, and inspect the flashing for damage.
• Measure and cut the new vent to size.
• Nail down a piece of flashing around its perimeter.
• Apply roofing cement or caulk around the edges of the roof vent.
• Fasten the vent into place using roofing nails or screws.

Cut A Hole

• Measure the old vent’s size and mark the center of the new one.
• Use a small saw to cut out the new hole, taking care not to make it too big.

Common Issues with Old Furnace Roof Venting

Rust and Corrosion
Over time, exposure to the elements can cause rust and corrosion in old furnace roof venting, compromising its integrity.

Ice Dams
Proper ventilation prevents ice dams caused by heat buildup in the attic space.

Blockage
Accumulated debris like leaves and animal nests can obstruct the venting, making your furnace work harder.

Damage from Wildlife
Animals can damage venting, potentially leading to holes and cracks.

Preventing Problems with Roof Venting

Regular Inspections
Schedule regular inspections by a professional HVAC technician to check for damage, blockage, or other issues.

Trim Nearby Trees
Keep trees and branches away from your venting to prevent damage and animal entry.

Install a Carbon Monoxide Detector
Protect against carbon monoxide buildup by installing a detector.

Maintain Cleanliness
Regularly clear debris from the venting and the area around it.

Proper Installation
Ensure correct installation to prevent future problems.

Choose the Right Type of Venting
Select venting suitable for your heating system and climate.

Use a Chimney Cap
Install a cap to deter animals and debris from entering the venting.

Professional Installation and Repair
For new installations or repairs, it’s best to hire a professional HVAC technician.

Conclusion

With the proper equipment, safety procedures, and understanding, removing and replacing outdated furnace roof venting is a straightforward undertaking. Your heating system can be kept secure and effective for many years by performing routine maintenance and adhering to the instructions provided here.