Installing loft insulation of adequate thickness can reduce your heating bills and your carbon footprint. Indeed if you have loft insulation of a thickness less than 10″ or no loft insulation at all, anything up to 20% of the heat energy from your heating system may be disappearing through the roof of your home. Loft insulation materials are very poor thermal conductors and act as a blanket preventing the movement of heat into the loft space from the house below. Loft insulation also has a cooling effect during the summer months stopping heat from sunshine on the roof from penetrating into your home. Loft installation is straightforward to install – within the scope of a competent DIY enthusiast in many cases – but may also be available free of charge or subsidised depending upon your personal circumstances and location.

Loft insulation is typically supplied as rolls of mineral fibre or fibreglass that can simply be laid on the floor of the loft space, between and over the joists, or as “loose fill” mineral wool or cellulose fibres that are blown into the loft space. Heat loss from joists is typically greater than from other areas of a loft so loft insulation should be laid across them; obscuring loft joists in this way is potentially hazardous so a walkway of boards or similar may be necessary from a safety point of view. In addition, loft insulation materials work by trapping air in their fibres and should therefore not be stretched or compressed to any large degree.

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