insulating a floor involves adding an insulating material beneath the floorboards, thereby reducing heat escaping through the floor into the ground. Approximately 15% of heat is lost through a house via this route. Insulation also acts to prevent draughts coming up through the floorboards. In addition the household should also consider insulating the gaps between the skirting boards and the floor, which also helps in reducing draughts.
Floor insulation is most commonly done when putting a new floor in place, but most floors can be retrofitted with insulating material, and this will make a large saving to your overall heating bill.