Insulation under my bath?

Posted 15th Dec 2016
Hi, live in a small old non cavity wall terrace. Bathroom is by a mile the coldest room in the house. Under the bath I can see floorboard and the bare wall for on end of the bath. Any advice? Want to fill everything ideally, but not with something that might promote damp. Someone said put loft insulation under. Or even fill bin bags with it and stuff them under?
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