How High Should Chimney Be Above Roof Peak

Don t forget to add in minimum chimney height.

How high should chimney be above roof peak. 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. That is correct but the chimney has to be at least 3 feet high overall. If your peak to penetration distance is 7 feet you would have a rise of 28 inches. Per the 10 and 2 rule once you are at the level of the peak you only need to be 2 feet above it.

Anon the chimney outlet needs to not only be proper height above the roof surface but proper distance from any opening that could take flue exhaust. But the pipe will require a 10 horizontal clearance from the roof. If the pipe is farther than 10 feet from the roof peak it must be 2. Usually unless you have a really shallow pitch roof you will have the 3 foot minimum height after satisfying the 2 foot above the nearest roof line within ten feet rule.

The 10 foot rule explains the clearance you need. This doesn t necessarily mean the pipe must be above the tallest part of the roof which is known as the ridge. So 28 inches plus 24 inches is a chimney height of only 52 inches. Knowing the pitch of the roof is extremely helpful in determining the height the chimney pipe must be above the roof.

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. For larger structures the result will depend on the roof pitch. They intend to make sure that the chimney draws properly and that a fire hazard does not occur. 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.

I have heard that the top of a wood burning stove pipe needs to be a certain height above the peak of the roof to work properly. 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. If you go through the peak you need 3 feet. 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. In that case the chimney needs to be 2 above the peak of the roof or 3 above the roof line whichever is higher. Easy calculation for chimney pipe height. I had the roof you see in the photos done in 1991.

For the next example you have a shorter chimney height. And at least 2 higher than any portion of a building within 10.