It's easy to find natural or recycled insulation for large areas like lofts and cavity walls. But what about smaller gaps like an inch or so between radiator pipes and floorboards? Wool might be attractive to moths so I'm not sure about that.
Also for gaps even smaller than that, basically crevices, what are the alternatives to things like silicone and caulk?
This is to stop draughts and also ingress of pests during the autumn and winter.