How High Above Roof Does Chimney Need
How high does the top of the chimney need to be above the surface of the deck. Chimneys need to be high enough to ensure that smoke is directed away from where it might be harmful to your neighbours. Most wood stove and factory-built fireplace manufacturers and local building codes will require that the chimney must extend at least 2 feet above any portion of any structure within 10 feet measured horizontally and must extend at least 3 feet above the highest point of its roof penetration. But there are always exceptions to the rule.
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The chimney should extend at least 3 feet above the roof surface it penetrates and 2 feet higher than any roofline or other obstacle within a horizontal distance of 10 feet.
How high above roof does chimney need. If you are using a metal type chimney the two foot rule is ok but you may have to support it if there is many feet outside above your roof to get the needed height. The 10 foot rule explains the clearance you need. The maximum freestanding stack height above the roof for a traditional masonry chimney is 45 times the narrowest horizontal part of the chimney.
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 chimney should extend at least 3 feet above the roof surface it penetrates and 2 feet higher than any roofline. If the flue exits the roof further down then it must extend high enough to achieve 23m of horizontal clearance.
If the pitch of the roof is 38 degrees or greater the termination point of the flue or chimney will need to be 2300mm horizontally from the roof line and roofing material. See our section on chimneys. How high does the flue have to go.
Minimum three feet above the high side of the roof. This means the 3 foot height must be measured from the roof on the upper uphill so to speak side of the roof at the base of the chimney. Does a chimney need to be higher than the roof.
Roughly this means that a chimney should be 3 feet higher than the point it passes through a roof while also being at least 2 feet taller than any part of a building thats within 10 feet 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 into the building. This rule means that they must extend 3 feet above the roof penetration on the shortest side and the top of the chimney must be 2 feet higher than any portion of the building structure within 10 feet.
This rule refers to the proper height of the chimney pipe above the roof. When installing a new twinwall flue system if the flue exits the roof within 600mm horizontally from the ridge high point of the roof then the flue must extend a minimum of 600mm above the ridge. Explained the chimney pipe must be a minimum of three feet above the roof but also two feet taller than anything within ten feet.
Taller chimneys make more draft but chimneys exposed to outside cold dont. In the case of stainless steel system chimneys the manufacturers installation instructions should be consulted. The usual height of a chimney should abide by the 10ft-2ft rule which would suffice under usual conditions.
But why is this. The height of a chimney has to be more than the standard height for wood and coal burners as a safety measure. As a guide a chimney that is 45m high from top of stove to top of pot should be high enough to ensure the stove has sufficient draft.
The current code states that chimney openings need to be at least 300mm higher than the highest part of any roof within 36 metres of the chimney. For a building with a steeply pitched roof the chimney opening needs to be 2 above the highest part of the roof within 10. Above the first floor is a deck so this chimney will be adjacent to the finished floor of the deck.
Out of a shed or caravan or boat. Obviously the 102 rule and the 3 rule doesnt apply lest the chimney flue outlet is rail height at the deck. This support can be made from emt type tubing and anchored to your roof or building or buy it from the Chimney manufacturer If you are using a mason type set up 2 or 3 feet is great.
This height requirement for masonry chimneys penetrating or adjacent to pitched roofs has been around for many decades. 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. With a modern twin wall system you should get away with 35m or even 3m if you have to eg.
Similarly it is asked how high should a flue be above the roof. Chimneys shall extend at least 2 feet 610 mm higher than any portion of a building within 10 feet 3048 mm but shall not be less than 3 feet 914 mm above the. It comes down to 3 different types of chimneys having their own rules Vent caps larger than 12 must be located at least 2 feet above the highest point and 2 feet higher than any portion of the building within a horizontal distance of 10 feet.
The chimney has to extend at least 3 feet above the highest point where it passes through the roof. Degrees the height of flue or chimney stack will need to be at least 1800mm above the roof when not close to the ridge.
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