This summer I had a new gas boiler installation in an airing cupboard near the centre of the first floor. Flue goes into the loft space and across to a gable end. Having just been up into the loft I see that the fitters have disturbed a lot of insulation whilst installing the flue and not bothered to put most of it back properly.
Are there any regulations about how close to gas flue pipes loft insulation can be?
The flue pipe is plastic so presumably gets nothing more than warm.
The only rule regarding flues I'm aware of is they must be separated from (combustible) timber by 75mm of air, or 25mm of incombustible material. I wasn't aware of any requirements where the flue is buried in insulation.
Interesting - I presume the distances from combustible materials were defined for old-fashioned, very hot, metal flues. There would seem to be no point in any separation at all with co-axial flues, where the outer tube carries only ambient air; even less with co-axial flues on condensing boilers, where even the inner, exhaust section is plastic! Either there is something I haven't thought of or the regs are way out of date for modern systems.
SteveW
I'm going by experience in a timber framed house. This document is useful:
I've not had a proper look, but a quick glance seems to suggest 25mm separation and only 10mm for a concentric flue for a boiler.
SteveW
Thanks for the responses. Looks like I can just put it back as best I can without being too fussy about clearances.
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