Does Loft Insulation catch mouldy? I have contractors surrounded by fitting a bathroom and the insulation in...

I have contractors surrounded by fitting a bathroom and the insulation in one of the walls have discoloured badly but they articulate it doesn't need replaced but i don't want to cover it up if it's mouldy.
Thank you
Answers:    If it is the Yellow roughage glass type, later yes it does loose its colour and go black after some amount of time, near is nothing stopping you from replacing it beside a new and conceivably more efficient publication ( compressed ) but if the contractor say it is not needed then I would move about with that, you come across to have found an honest one, most would exchange it any way to engineer an extra few pounds.
it can...and it usually compacts too.