How Tall Chimney Above Roof Line

For most small structures like small cabins and tiny homes the tallest part of the structure is within 10 of the chimney.

How tall chimney above roof line. Prompted by a question from a csia certified chimney sweep ashley eldridge in his 21st year as the chimney safety institute director of education talks ab. 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. Code requires that a chimney be three feet above the roof where it exits and two feet higher than any part of the roof within ten feet. Inside the flue each cubic foot of which is lighter than a cubic foot of cooler ambient air.

Pushing gently on a tall flue like this should not produce easy movement. The chimney must extend at least 3 above the highest point where it passes through a roof. Don t try this at home and certainly not when there are people below or when the flue is in use or probably any other time. Per the 10 and 2 rule once you are at the level of the peak you only need to be 2 feet above it.

What is the 2 foot 10 foot 3 foot rule. 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. If your peak to penetration distance is 7 feet you would have a rise of 28 inches. So 28 inches plus 24 inches is a chimney height of only 52 inches.

This will generally cause you fewer problems as a homeowner. For the next example you have a shorter chimney height. The maximum freestanding stack height above the roof for a traditional masonry chimney is 4 5 times the narrowest horizontal part of the chimney. If the pipe is farther than 10 feet from the roof.

In the case of stainless steel system chimneys the manufacturer s installation instructions should be consulted. This is a bit of an odd measurement and chimney clearance case because the chimney side is actually about 8 away from the roof edge. The height of the chimney above the roof surface measured at the up slope side of the chimney from the roof surface to the chimney top should be at least three feet the green line in our photo. Bottom line the height.

However in most cases it will be around 3 metres. The chimney in our photo above left rocked and nearly fell over when we leaned on it a bit while climbing onto this roof.