How High Should Your Chimney Be Above The Roof

Easy calculation for chimney pipe height.

How high should your chimney be above the roof.

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. You are close to your eave and you find that your measurement is 18 feet from peak to penetration on a 4 12 pitch see figure 3. Let s look at a couple of examples. 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.

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. This is why the rule calls for the chimney to extend 2 feet above any structure within 10 feet of the chimney. However in most cases it will be around 3 metres. Many people mistakenly think that the pipe always has to be 2 feet above the roof peak.

For 18 feet of run you would have a rise of 72 inches. 0 60m above the tip highest point of the roof but as long as it is above the roof it will work ok and not smoke how high should a chimney top be. If your home is at a particularly high altitude i recommend consulting a professional in your area when it comes to these particular specifications. Knowing the pitch of the roof is extremely helpful in determining the height the chimney pipe must be above the roof.

Chimneys need to be high enough to ensure that smoke is directed away from where it might be harmful to your neighbours. This doesn t necessarily mean the pipe must be above the tallest part of the roof which is known as the ridge. The 10 foot rule explains the clearance you need. This can cause draft problems.

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. A chimney should be at least two feet above. The maximum freestanding stack height above the roof for a traditional masonry chimney is 4 5 times the narrowest horizontal part of the chimney. But the pipe will require a 10 horizontal clearance from the roof.

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.