Venting Furnace Through Metal Roof

If your furnace has an afue rating below 90 percent it will most likely have a flue pipe that goes up through your roof.

Venting furnace through metal roof.

Run the vent pipe up through the roof and install a metal or pvc flashing collar over it. Match the vent pipe to the furnace maker s recommendations either sheet metal or vinyl. That s because the combustion byproducts are in a gaseous form so the gases can float up through the flue pipe and out of your roof. In many cases for existing homes this is the easier way to go.

The metal i m using is called crinkle black i purchased all my materials at h. If there is no sub roof to support the metal roof consider installing slatted vents just under the eaves instead of on the roof. First you ll partially block your roof vent with the piping reducing the flow of cooling air through your attic. Installing some type of ventilation mechanism on a metal roof is not a lot different from the addition of vents to any type of roof.

So which type of venting system should your furnace have. In this video i cover installing a roof boot for a vent pipe in a metal roof. The water will condense and drip into the insulation below and perhaps into the house. Should my furnace flue pipe go through the roof or the side of the house.

Second during cold winters you ll be blowing warm moist air onto a cold surface the roof vent and roof plywood. The other option of course is a vented attic which requires an equal balance of intake and exhaust vents.