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How to insulate walls

A person tucking an insulation batt behind a noggin on a stud a wall

Overview

Insulation in your walls reduces heating and cooling costs, and helps stop sound travelling between rooms. We'll teach you how to trim insulation batts to size and install them between the joists in your wall cavity.

Tools and materials

Tools

Materials

Steps

1Install insulation batts in the wall cavity

Before you start, switch off the electricity and make sure all your electrical cables are safely out of the way. Then push the batts between the wall studs. Make sure you fill every gap in the cavity of your wall.
A person inserting an insulation batt between studs on a wall

2Trim the insulation to fill small gaps in the wall cavity

When you are insulating smaller spaces, measure the gap between the studs then trim your batt to size using a knife and a straight edge. Cut the batt slightly larger than the gap so it sits snugly in place. When the whole wall cavity is filled, you're ready to put your wall up.
A person tucking an insulation batt behind a noggin on a stud a wall

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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. You can also use a simple test kit from Bunnings to indicate the presence of lead-based paint.