Diagram 2 shows the area on a traditionally constructed non flammable material roof where the flue must not terminate.
Minimum chimney height above roof.
Round chimney flues shall have a minimum net cross sectional area of not less than 1 12 of the fireplace opening.
3 at roofline and 2 at 10.
The chimney is a minimum for 3 above the uphill side of the roof and 2 higher than anything within 10 feet.
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.
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.
3 16 1 number.
At this point we cover everything in the rule.
This will generally cause you fewer problems as a homeowner.
This clearance is set up to help prevent any embers from landing on the roof.
Brickwork heavyweight concrete block and so on where.
Chimney heights and termination.
How far from a window must the chimney cowl be in the u k.
On a flat roof may not be tall enough.
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.
The chimney must extend at least 3 above the highest point where it passes through a roof.
The chimney in this example must extend 52 above the roof measured from uphill side of the chimney.
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.
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.
What is the 2 foot 10 foot 3 foot rule.
For 18 feet of run you would have a rise of 72 inches.
For the next example you have a shorter chimney height.
The height of the chimney shall be measured from the firebox floor to the top of the chimney flue.
The minimum chimney heights above roof are in the article above.
The distance between the cowl of the flue and the adjacent roof wall structure should be higher than 2 3 mtr.
The flue or chimney outlet must be above and outside of the shaded area.
