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.

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. The water will condense and drip into the insulation below and perhaps into the house. Run the vent pipe up through the roof and install a metal or pvc flashing collar over it. Second during cold winters you ll be blowing warm moist air onto a cold surface the roof vent and roof plywood.

That depends on whether you have a standard efficiency or a high efficiency furnace. In many cases for existing homes this is the easier way to go. Metal roofing works well with this because the metal is unaffected by heat not being able to pass through it and enter the attic. Should my furnace flue pipe go through the roof or the side of the house.

First you ll partially block your roof vent with the piping reducing the flow of cooling air through your attic. Should you vent a metal roof. If there is no sub roof to support the metal roof consider installing slatted vents just under the eaves instead of on the roof. So which type of venting system should your furnace have.

The other option of course is a vented attic which requires an equal balance of intake and exhaust vents. In this video i cover installing a roof boot for a vent pipe in a metal roof.