How to insulate a ceiling

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How to insulate a ceiling

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Project Overview

Good insulation in your ceiling keeps your home warm in winter and cooler in summer. It can also help you save on energy bill. We’ll teach you when is the best time to install insulation, how to cut it to size and some handy hints to make the job easier and safer.

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Ladder safety tip

Ladders are important tools but they need to be used the right way. Falling off a ladder is responsible for more hospital visits than any other accident in the home. The safest way to use a ladder is to open the legs fully and lock the hinges in place. This ensures the ladder won’t collapse and makes it as stable as possible.

Step by Step Instructions

1 Tips before you start insulating your ceiling
2 Measure and cut the insulation
3 Installing the insulation
  • Step 1. Tips before you start insulating your ceiling

    Make sure the power is turned off before you start insulating your home. You should also work well away from any electrical wires in the ceiling space. Keep the insulation away from any lights to prevent it from catching fire. It’s best to install insulation in the morning before it gets too hot in the roof space. Always wear coveralls, gloves, dust mask and safety glasses because some insulation can be irritating to your skin.
  • Step 2. Measure and cut the insulation

    Wearing your safety gear, use your tape measure to measure the distance between the ceiling joists. Remember not all of the distances between the ceiling joists will be the same, so check them all. Using these measurements, cut your first piece of insulation to size with the utility knife and straight edge.
  • Step 3. Installing the insulation

    Standing on your step ladder, feed the first piece of insulation between the ceiling joists until it is laid flat. Make sure to keep it away from any lights. Keep measuring, cutting and installing until all of your roof has been covered. Keep any of the insulation off-cuts until you have finished the job, they can come in handy to fill in small gaps between the joists.

Tools and Materials

Tools

  • Coveralls
  • Dust mask
  • Gloves
  • Ladder
  • Safety glasses
  • Straight edge
  • Tape measure
  • Utility knife

Materials

  • Insulation – the higher the R value the better the insulation
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Health & Safety

Please make sure you use all equipment appropriately and safely when following the advice in these D.I.Y. videos. You need to be familiar with how to use equipment safely and follow the instructions that came with the equipment. If you are unsure, you may feel it is safest to consult an expert, such as the manufacturer or an expert Bunnings Team Member.

Grave health hazards are linked to asbestos, which may be in homes built up to 1990. Health hazards may result from exposure to lead-based paints in older materials and copper chromium arsenic (CCA) treated timber. For information on the dangers of asbestos, lead-based paint and CCA treated timber and tips for dealing with these materials contact your local council's Environmental Health Officer or visit our Health & Safety page. You can also use a simple test kit from Bunnings to indicate the presence of lead-based paint.
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