Hi. I have what I presume to be a soil vent pipe in the corner of my kitchen ('bout 40mm diameter, metal (got a nice ring to it!), runs from under my floor up through my ceiling, the flat above and vents outside the tiling on the roof). I'm just been putting new plasterboard up on the ceiling complete with insulation. The cavity that the soil vent pipe runs in is quite big - about 12 cm depth by 15cm wide. My question is can I insulate this? I can't see why not, as the odours etc presumably run through the pipe and not outside it, otherwise it wouldn't be doing it's job, however I've no idea what regs etc say. I'd quite like to stuff insulation in there as I could be losing a fair bit of heat through a cavity that size.
Thanks
Tom
Thanks
Tom