How to insulate walls

How to install insulation in walls

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How to install insulation in walls

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Project 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 segments to size and install them between the joists in your wall cavity.
Continue to step-by-step instructions

Step by Step Instructions

1 Install insulation segments in the wall cavity
2 Trim the insulation to fill small gaps in the wall cavity

  • Step 1. Install insulation segments 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 segments between the wall studs. Make sure you fill every gap in the cavity of your wall.
    Previous Step Next Step
    Woman installing insulation batts

  • Step 2. Trim 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 segment to size using a knife and a straight edge. Cut the segment 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.
    Previous Step Next Step
    Woman filling small gaps with insulation

Tools and Materials

Tools

  • Dust mask
  • Gloves
  • Ladder
  • Measuring tape
  • Safety glasses
  • Straight edge
  • Trimming knife

Materials

  • Insulation batts

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