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Any chimney should terminate at least 600mm above the ridge height. This is a minimum to comply with building regs. This is measured to the top of the pot. If the terminal is coming out of the "slope" of the roof and not the ridge, then at least 2.3m measured horizontally from the roof surface. These are to meet the minimum requrement of building control but in reality can differ with each installation. Things like neighbouring buildings, tall trees and locallity can all affect the working of the chimney, as can the internal size of the flueway and where it is located on the house itself. If the chimney is internally built, there is good insulation from the building itself to keep the flue gasses warm. If the chimney is on a gable end with only 4" of brickwork between it and the outside, then the movement of the flue gases will be slower due to them cooilng down. I would like to say that you should be confident in the advice given by getting a tradesperson that has the relevant certificates to do the job in question. but you would be better contacting the governing body in question (HETAS or GASafe for example) and getting the list of recommended installers.

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Q: How high should a chimney stack be above the roofdoes the height include chimney pot?
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