The majority of suspended floors in our new-build and some original floors have been insulated with celotex. I installed a considerable proportion of this myself (using the ubiquitous bread knife!!), following the correct procedures to allow for air-flow, etc. However, over the last year or so, after the addition of a utility room, an intermittent unpleasant seweragey smell wafts around in the kitchen next to the utility area. I have eliminated the majority of possibilities (dead buffalo under floorboards, leaking soil pipes, fluctuating weather conditions, etc.) but these theories are not consistently/logically viable. I thought I would follow up one of my more obscure theories that certain conditions might cause celotex/kingspan to emit odours (dependent on the type of chemicals involved in their processing) and my limited research thus far has discovered several other people making the same enquiry!! Surely, this cannot be coincidence. Naturally, the last people I would approach at this juncture would be the companies themselves ('look out-litigation' alarm bells would be set off!) so, could I ask anyone who has any personal, or anecdotal hearsay evidence on the matter of unusual smells possibly related to the installation of kingspan/celotex to please respond asap! Thanks