flue clearance question

[nick60]

afternoon all, when a flue disharges above a flat roof I understand it should have a minimum vertical clearance of 300mm but what about if it disharges close to a flat roof but not directly above it? In this particular case the flue is about 600m horizontally from a flat roof. I'm guessing that the 300mm vertical clearance still needs to be met - is that correct? TIA

 

[sooey]

The 300 mm above a flat roof is to prevent the flue becoming blocked by a build up of snow or leaves, so if it's not above the roof you shouldn't have to worry about that. Your installer will be best to advise you.

 

[nick60]

thanks sooey but it's a long story this one. The flue is my neighbour's and it's already in position. I extended a flat roof (with full planning permission/building regs etc) so there is now a flat roof below the flue. The 300mm clearance requirement is not met so there is a problem. Before I get into further discussions with my neighbour I'm trying to work out if the flue was incorrectly positioned even before I extended the roof. Before I did this work my neighbour told me that on their annual British Gas service visits the engineer always made a note that the flue position was not to regs. If this was the case it helps with my argument that my flat roof extension has not created a problem, it's simply exacerbated a problem that was already there.

 

[kirkgas]

before we comment on the flue we need to know the boiler make and model so we know if it is room sealed or open,

 

[nick60]

kirkgas, it's an Ideal Classic NF60. 18 years old so perhaps it will blow up soon and they'll have to replace it, with the flue properly positioned.