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Loft Insulation










Before                                                                                                  After      

Heat rises, and in an uninsulated home, a quarter of heat is lost through the roof. Insulating your loft, attic or flat roof is a simple and effective way to reduce heat loss and reduce your heating bills*. *Energy saving trust

Loft insulation is effective for at least 42 years and it should pay for itself many times over*.*Energy saving trust, (

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

Loft insulation is easy and quick to install using rolls of mineral wool insulation. The first layer is laid between the joists – the horizontal beams that make up the ‘floor’ of the loft – then another layer is cross-laid at right angles to cover the joists and make the insulation up to the required depth.

Pipes, water tank and loft hatch

Insulating between the joists of your loft will keep your house warmer but make the roof space above colder. Pipes and water tanks will be more likely to freeze, so you will need to insulate them. If your water tanks are some distance from the loft hatch, you will also need something to walk on for safe access.

The cooler air in your insulated loft could mean that cold draughts come through the loft hatch. To prevent this fit an insulated loft hatch and put strips of draught-excluding material around the hatch edges.

Storage space

If you plan to use the loft or attic for storage, you will want to lay boards over the joists. Unfortunately, if you only insulate between the joists before doing this, the insulation won't be thick enough. 

To get enough insulation you can do the following:

  • Insulate between the joists with mineral wool and then lay rigid insulation boards on top, with wooden boarding on top of that. You can buy insulation board pre-bonded to floor boarding to make the job easier. Or
  • raise the level of the floor so you can fit enough mineral wool beneath the new floor level. 

Either way, make sure you don't squash the mineral wool when you fit the boards on top as this this will reduce its insulation value *.*Energy saving trust, (

How much you can save

England, Scotland and Wales

Loft insulation (0 to 270mm)

Detached houseSemi detached houseMid terrace houseDetached bungalow
Fuel bill savings (£/year) £240 £140 £135 £200
Typical installation cost* £395 £300 £285 £375
Carbon dioxide savings (kgCO2/year) 990 kg 590 kg 550 kg 820 kg

Loft insulation top up (120 to 270mm)

Detached houseSemi detached houseMid terrace houseDetached bungalow
Fuel bill savings (£/year) £25 £15 £15 £20
Typical installation cost* £310 £250 £240 £295
Carbon dioxide savings (kgCO2/year) 95 kg 55 kg 50 kg 80 kg

Estimates 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*.*Energy saving trust, (


-       Reduces heat loss

-       Reduces your heating bills

-       Keeps your house warmer in the winter and cooler in the summer

-       Competitive prices

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