How to install underfloor insulation batts

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How to install underfloor insulation batts

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Project Overview

Insulating your floor makes your home more comfortable and reduces your heating and cooling costs. We show you how to install the insulation batts yourself. You will learn how to put the batts in between the floor joists and trim them to size. We also show you how to install support strapping under the batts to stop them from sagging.
Continue to step-by-step instructions

Step by Step Instructions

1 Install strapping to support the glass wool floor insulation
2 Install the glass wool insulation in the floor
  • Step 1. Install strapping to support the glass wool floor insulation

    Staple the strapping across the gap under your floor joists. Pull the strapping tight across the gap before stapling it in place. The manufacturer’s instructions recommend installing at least three straps under each batt, but it is easier to simply lay a line of strapping every 200mm across the whole floor.
  • Step 2. Install the glass wool insulation in the floor

    Open the packets of batts one at a time and let the contents expand before you install them. Fluff each batt up and install it between the joists in your subfloor. To get the best results, keep the batts snugly together. If you have any small gaps left, trim the batt to size with you scissors.

Tools and Materials

Tools

  • Gloves
  • Scissors
  • Staple gun
  • Tape measure
  • Trimming knife

Materials

  • Floor insulation strapping
  • Glass wool floor batts
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