Insulate your loft

Job description:

Insulating your loft has never been so important. It is an effective way to save energy and money. The recommended minimum thickness of 270mm can cut your heating cost by 15%. Lagging pipes at the same time can add even more savings. If you are after a 'cold roof' insulation you will lay the material at joist level. A 'warm roof' is insulated between and under the rafters of the roof. According to the Energy Saving Trust if everyone in the UK topped up their loft insulation to 270mm, £380 million would be saved; that's enough money to pay for the annual fuel bill of over 400,000 families.

Skill level: 2 – Intermediate  

Materials required:

  • Measuring Tape
  • Drill
  • Hammer
  • Adhesive foil tape
  • Loft lamp
  • Scissors
  • Dust mask, goggles and gloves
  • Loft insulation materials

Step by step guide to insulating your loft:

1. Check whether you already have any loft insulation and how much. Please note that if you insulate up to 270mm, the joists in your loft will be covered-up, making it hazardous to walk around in the loft therafter. You can't store anything heavy in the loft either, unless you put in special raised boards.Putting items on insulation weighs it down and will reduce its effectiveness.

2. Clean the floor of all debris and all the boards before starting the work. Make sure that any electrical cables are placed above your insulating material.

3. Check the attic ceiling for signs of water marks or woodworm. If you do spot anything that concerns you, call in a professional before you start the work.

4. Unroll the insulation starting at the eaves, leave a gap along the eaves of around 50mm so that air can circulate within the loft and not create any condensation problems .

5. Cut the insulation to length when required and place it against the next piece. Continue until the loft space is covered with the insulation.

6. Repeat for every joist space, making sure the blanket insulation is tucked under any electric wiring to avoid the risk of overheating.

7. To increase depth, you can run a second layer of insulation at right angles to the first.

8. Use custom made pipe insulation for all your pipes using tapes to keep it in position.

9. Cut lengths of blanket to insulate the join of the rafters and floor joists.

10. Lay the first board across the joists in placing it against the rafters. Use screw to fix the board to the joist.

11. Glue the board edges with wood adhesive and then fit the boards using their tongue-and-groove system.

12. If you are converting the attic into a living space, there are regulations on the amount of insulation needed. If the depth of the rafters is an issue you will have to add wood to their undersides. You will need to insulate the dry wall as well.

13. If you have any water tanks you should insulate them with insulation jackets.But don't lay insulation under the tank as the heat rising from below will help to avoid freezing.

Loft insulation is generally effective for at least 40 years. The better insulated your home, the less energy you need to keep it warm, saving you money on your energy bills and reducing your impact on the environment. While loft insulation is important, you should not neglect to think about making your home greener. Go Greena Ltd can advise you on all the energy savings options like solar panels, cavity wall insulation to replacement boilers

Unless you are good at DIY, you might want to contact a local insulation tradesman.

The information provided in this guide is to be used strictly for guidance only. We recommend you always read the manufacturer's instructions.