Gas Flue Height Above Roof

Per the 10 and 2 rule once you are at the level of the peak you only need to be 2 feet above it.

Gas flue height above roof.

Gas fireplace direct vent termination cap clearance distances clearances between the gas fireplace exhaust vent and other building components or features. The top of a chimney pipe must extend at least 2 feet above the peak of the roof if the pipe is within 10 feet of the peak. The 1992 vent sizing tables require that all type b gas vents terminate above the roof with a listed cap or listed roof assembly in accordance with the manufacturer s instructions. Single wall metal pipe shall extend at least 2 feet 610 mm above the highest point where it passes through a roof of a building and at least 2 feet 610 mm higher than any portion of a.

The minimum height of the top of the flue varies depending on where it is on the roof. If the flue is over 3 m from the roof apex the flue top must be 1 000 mm minimum above the roof and at least 3 m horizontally from. For a gas vent or type l vent this height must be 2 ft 0 61m or more. Vent caps 12 and smaller may terminate a distance above the roof if 8 feet or more away from a vertical surface as follows.

Roof pitch rise run in inchesminimum height flat to 7 12 1 0 foot above the roof surface 7 12 to 8 12 1 5 feet above the roof surface 8 12 to 9 12 2 0 feet above the roof surface. If the pipe is farther than 10 feet from the roof. This article gives typical clearance distance requirements between the termination cap of a gas fireplace or fireplace insert and other building or site features such as windows doors other mechanical system components air intakes. If the flue is within 3 m horizontally of the roof apex the flue top must be at least 600 mm above the roof apex.

So 28 inches plus 24 inches is a chimney height of only 52 inches. A vertical line drawn along the up roof side of the chimney from the roof surface to the top of the chimney flue opening shall be at least 3 ft in height. Details about chimney height rooftop clearance requirements on buildings for all types of chimneys is at chimney height clearance code. Single wall metal pipe shall terminate at least 5 feet 1524 mm in vertical height above the highest connected equipment draft hood outlet or flue collar.

This means that below 38 degree roof pitches that the height of the flue outlet should be at least 1800mm above the roof when not close to the ridge and above 38 degree roof pitches the flue outlet height should be 2300mm horizontally back to the roof flue height figures are given in the table above where the flue is not close to the ridge.