Flue Height Above Roof Line

Homes built on varying terrain have their own set of chimney and flue regulations.

Flue height above roof line.

Flues need to be 600mm higher than the highest part of the roof within 3 metres. 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. Degrees the height of flue or chimney stack will need to be at least 1800mm above the roof when not close to the ridge. 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.

11 12 to 12 12 4 0 feet above the roof surface continues to 21 12 pitch at 8 0 feet vent caps larger than 12 must be located at least 2 feet above the highest point and 2 feet higher than any portion of the building within a horizontal distance of 10 feet. Flues that are more than 3 metres away from the highest part of the roof need to be 1000mm above the flue penetration. The minimum chimney height recommended for minimum performance of wood burning and multi fuel appliances is 4 5 m from the top of the appliance to the top of the chimney. The distance between the cowl of the flue and the adjacent roof wall structure should be higher than 2 3 mtr.

If the pitch of the roof is 38 degrees or greater the termination point of the flue or chimney will need to be 2300mm horizontally from the roof line and roofing material. If the pipe is farther than 10 feet from the roof peak it must be 2. So take the top number of your roof pitch and multiply it by 10 then add 24 note example 1. The top of the flue opening should be 3 ft 0 92 m above any roof surface.

Back to our example over a run of 10 feet the roof would rise 40 inches.