Loft Insulation

loft insulation

As everyone knows, heat rises. In an uninsulated home, a quarter of heat is lost through the roof. Insulating your roof space is a simple and effective way to reduce heat loss and reduce your heating bills.

Loft insulation is effective for at least 42 years and it should pay for itself many times over.

How much you can save?

Below are tables of Loft Insulation saving figures for England, Scotland and Wales.

Loft insulation (0 to 270mm)DetachedSemi-detachedMid-terraceBungalow
Fuel bill savings (£/year)£240£140£135£200
Typical installation cost£395£300£285£375
Carbon dioxide savings (kgC02/year)990 kg580 kg550 kg820 kg

Loft insulation top up (120 to 270mm)DetachedSemi-detachedMid-terraceBungalow
Fuel bill savings (£/year)£25£15£15£20
Typical installation cost£310£250£240£295
Carbon dioxide savings (kgC02/year)95 kg55 kg50 kg80 kg

These are estimated figures based on insulating a gas-heated home with either a totally uninsulated loft, or topping up existing insulation from 120mm to 270mm. (The recommended depth for mineral wool insulation is 270mm but other materials need different depths). Average unsubsidised professional installation costs, although these will vary. Figures are provided by Energy Saving Trust.

If your loft is easy to access and has no damp or condensation problems it should be easy to insulate.

To insulate a roof space, mineral wool insulation is laid across the joists. The first layer is laid between the joists – the horizontal beams that make up the floor of the loft – then another layer is laid at right angles to cover the joists and make the insulation up to the required depth and reduce the chance of warm air escaping between any gaps in the insulation.

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