How to install roxul insulation

Written by bob white
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How to install roxul insulation
Installing Roxul in your exterior walls can reduce your heat loss. (Thomas Northcut/Photodisc/Getty Images)

Installing Roxul in your home's walls will reduce your heating and cooling bills. Roxul is made from a combination of stone and recycled slag. Its non-directional fibre structure makes it an effective barrier against sound. Because of its stone composition, it won't burn or release toxic gases when heated. It is also a water repellent and won't compress when exposed to moisture. Roxul is simple to install because it is easy to cut and fit into your current wall system.

Skill level:
Moderately Easy

Things you need

  • Bread knife
  • Gloves

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  1. 1

    Choose a Roxul insulation that matches the width of the framing members. For a 2x6 wall, choose Roxul batts which are 5-1/2 inches wide.

  2. 2

    Push the batt in between the wall studs starting at the top of the wall. Make sure there are no gaps and the insulation is flush with the surface of the studs.

  3. 3

    Install the batt below the first batt in the same method, making sure to snugly butt the insulation sections together.

  4. 4

    Cut the insulation with a bread knife to fit around windows, doors and electrical boxes. Do not compress the insulation as this reduces its effectiveness.

  5. 5

    Cut a groove in the insulation with the bread knife to accommodate electrical wires in the wall.

  6. 6

    Cut a notch out of the batt that allows it to slide behind electrical boxes but still firmly meets the three sides of the box.

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