Loft insulation reduces heat loss by the materials used for insulation preventing the movement of the heated air particles , this is done by the fibres not letting the warm air escape. The energy is transferred by a conductor being the ceiling , into the loft. Without loft insulation a convection current takes place where the warm air moves through the roof space after the air at the base of the loft warms up leaving the air to escape through the roof (tiles). When the loft is insulated it is considered as a blanket trapping rising heat in the house. The convection current does not allow the uninsulated lofts to move the air in the insulation. Heat energy in the loft is transferred by the convection currents to the roof tiles. It has trapped air which is a poor insulator as warm particles are less dense. There are four basic types of insulating materials used are matting,loose-fill,blown insulation is made of fire and rigid insulating boards.
The thickness of the material plays a big part for the loft insulation this is because in order to reduce the amount of heat loss ,the insulation has