How High Should Chimney Be Above Roof Peak

Vertical blue line along the left side of the chimney in our photo.

How high should chimney be above roof peak.

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. Per the 10 and 2 rule once you are at the level of the peak you only need to be 2 feet above it. Specifications aren t there to merely cause you problems. If the pipe is farther than 10 feet from the roof peak it must be 2.

They intend to make sure that the chimney draws properly and that a fire hazard does not occur. In that case the chimney needs to be 2 above the peak of the roof or 3 above the roof line whichever is higher. 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.

So 28 inches plus 24 inches is a chimney height of only 52 inches. 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. The 10 foot rule explains the clearance you need. And at least 2 higher than any portion of a building within 10.

The chimney must extend at least 3 above the highest point where it passes through a roof. Explained the chimney pipe must be a minimum of three feet above the roof but also two feet taller than anything within ten feet. This specification makes sure steep roof slopes are cleared. If your peak to penetration distance is 7 feet you would have a rise of 28 inches.

The top of the chimney should be at least 3 ft 0 92 m above the roof surface. For larger structures the result will depend on the roof pitch. This rule refers to the proper height of the chimney pipe above the roof.