Minimum Chimney Height Above Roof

The flue or chimney outlet must be above and outside of the shaded area.

Minimum chimney height above roof.

For 18 feet of run you would have a rise of 72 inches. Brickwork heavyweight concrete block and so on where. The chimney must extend at least 3 above the highest point where it passes through a roof. The chimney is a minimum for 3 above the uphill side of the roof and 2 higher than anything within 10 feet.

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. Diagram 2 shows the area on a traditionally constructed non flammable material roof where the flue must not terminate. The distance between the cowl of the flue and the adjacent roof wall structure should be higher than 2 3 mtr. How far from a window must the chimney cowl be in the u k.

At this point we cover everything in the rule. The chimney in this example must extend 52 above the roof measured from uphill side of the chimney. The minimum chimney height recommended for minimum performance of wood burning and multi fuel appliances is 4 5 m from the top of the appliance to the top of the chimney. For the case you describe there are other distances like from windows and depending on the total chimney height even meeting the above roof minimum distance 3 ft.

Round chimney flues shall have a minimum net cross sectional area of not less than 1 12 of the fireplace opening. If the chimney or flue exits the roof within 600mm horizontally of the ridge then the flue or chimney should be a minimum of 600mm above the ridge. This will generally cause you fewer problems as a homeowner. 3 16 1 number.

The minimum chimney heights above roof are in the article above. This clearance is set up to help prevent any embers from landing on the roof. 3 at roofline and 2 at 10. The height of the chimney shall be measured from the firebox floor to the top of the chimney flue.

What is the 2 foot 10 foot 3 foot rule. Chimney height regulations chimneys need to be high enough to ensure that smoke is directed away from where it might be harmful to your neighbours. Positing a chimney on the home relative to the rest of the home may cause it to draw better. This means that below 38 degree roof pitches that the height of the flue outlet should be at least 1800mm above the roof when not close to the ridge and above 38 degree roof pitches the flue outlet height should be 2300mm horizontally back to the roof flue height figures are given in the table above where the flue is not close to the ridge.

When a chimney is not adequately supported by ties or securely restrained in any way its height h when measured from the highest point of intersection with the roof surface gutter and so on should not exceed 4 5w provided the density of the masonry is greater than 1500 kg m 3 that is. If the previous calculation results in the required height of 64 inches we can see that the top of the pipe will not rise above the roof peak but would still meet the requirements of the rule.