How High Chimney Above Roof Line Uk

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.

How high chimney above roof line uk. 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. Imagine an imaginary horizontal line extending 2 3m in all. Chimney height may need to be increased by 2 3 per 1000 feet of elevation although added height generally equates to stronger draft there is a point where the system can become too long and over drafting might occur. 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. 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. 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. These rules helps ensure draft is not spoiled by wind induced turbulence.

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. Flues need to be 600mm higher than the highest part of the roof within 3 metres. The 10 foot rule explains the clearance you need. If the top of the chimney is within 600mm 60cm of the ridge it should finish 60cm higher than the ridge.

Two things determine chimney draft. Flues that are more than 3 metres away from the highest part of the roof need to be 1000mm above the flue penetration. We also have the 2 3m rule. The chimney must extend at least 3 above the highest point where it passes through a roof.

Look at the top of your chimney where the smoke comes out. They intend to make sure that the chimney draws properly and that a fire hazard does not occur. Other factors can influence the necessary height of the chimney such as house stack effect and high altitude. Degrees the height of flue or chimney stack will need to be at least 1800mm above the roof when not close to the ridge.

And at least 2 higher than any portion of a building within 10. Taller chimneys make more draft but chimneys exposed to outside cold don t. If the pipe is farther than 10 feet from the roof.