Fitting insulation that is at least 250mm thick could cut heat loss by around 30 per cent. Insulation is simply laid over the floor of the loft, between and then over the joists if they are visible.
Protective clothing, gloves and masks should be worn. Care must be taken not to insulate below the cold water tank, if one is present, and not to compress the insulation in tight corners or eaves. Walk boards can then be laid over the joists to provide safe access from the loft hatch to any water tanks (if present).
Loft insulation can be carried out as a DIY task or by a professional installer. There are grants and offers available to help you pay for loft insulation.