Flue Height Above Roof Line

Homes built on varying terrain have their own set of chimney and flue regulations.

Flue height above roof line.

This is for masonry chimneys. So take the top number of your roof pitch and multiply it by 10 then add 24 note example 1. Additionally per our rule we need to add 2 feet or 24 inches giving us a total height of 64 inches. The distance between the cowl of the flue and the adjacent roof wall structure should be higher than 2 3 mtr.

Flues that are more than 3 metres away from the highest part of the roof need to be 1000mm above the flue penetration. 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. Back to our example over a run of 10 feet the roof would rise 40 inches. 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.

The top of the flue opening should be 3 ft 0 92 m above any roof surface. For a gas vent or type l vent this height must be 2 ft 0 61m or more. If the pipe is farther than 10 feet from the roof peak it must be 2. Flues need to be 600mm higher than the highest part of the roof within 3 metres.

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.