How High Should Chimney Be Above Roof Peak

This specification makes sure steep roof slopes are cleared.

How high should chimney be above roof peak.

They intend to make sure that the chimney draws properly and that a fire hazard does not occur. Explained the chimney pipe must be a minimum of three feet above the roof but also two feet taller than anything within ten feet. Both above the flat roof and 2 feet above the point at which a horizontal line from the chimney would touch the highest portion of the nearest roof. If the pipe is farther than 10 feet from the roof peak it must be 2.

Specifications aren t there to merely cause you problems. 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. Vertical blue line along the left side of the chimney in our photo. In that case the chimney needs to be 2 above the peak of the roof or 3 above the roof line whichever is higher.

The chimney must extend at least 3 above the highest point where it passes through a roof. This rule refers to the proper height of the chimney pipe above the roof. This reduces the actual required height by 12 inches from our previous calculation of 64 inches. For gas vents or a type l vent this distance above the roof surface must be at least 2 ft 0 61m.

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. For larger structures the result will depend on the roof pitch. The current code states that chimney openings need to be at least 300mm higher than the highest part of any roof within 3 6 metres of the chimney.

And at least 2 higher than any portion of a building within 10. Per the 10 and 2 rule once you are at the level of the peak you only need to be 2 feet above it. For a building with flat or shallow pitched roof the chimney needs to be 3 feet above the point where it passes the roof line.