DIY Network

How to Add Roof Insulation

These step-by-step instructions demonstrate how to install insulation in an attic using a portable insulation blower.

More in Remodeling

installing insulation in attic
  • Time

    1 hour

  • Price Range

    $50 - $100

  • Difficulty

    Easy to Moderate


Step 1: Determine the Amount of Insulation Needed

Before adding any insulation to an attic, figure out how much insulation (R-value) is already there and what is recommended for the area.

After determining how many bags of insulation are needed, two people are needed to complete the task: One person to man the hopper and keep it full, and the other person to man the hose in the attic.

Step 2: Wield the Hose to Apply Insulation

Once the hopper is turned on, keep the hose moving to ensure even distribution. Place a hand over the hose like a baffle to help control the flow of insulation.

apply insulation with hose