Can Cellulose Insulation Be Installed In Existing Walls?

Installing Cellulose Insulation in Existing Walls

Cellulose insulation can be blown into existing walls, but it’s essential to follow specific guidelines to avoid damage to the walls or the insulation itself. Before installing, ensure that the walls are free from obstructions such as wiring, plumbing, or insulation already in place.

Preparing the Walls for Cellulose Insulation

To prepare the walls, drill 1-inch diameter holes spaced 16 inches on center to allow the cellulose insulation to enter. Use a drill bit with a screwdriver tip to create a pilot hole, then enlarge the hole using a hole saw or a reciprocating saw with a metal blade. Remove any existing insulation, dust, or debris from the hole and surrounding area.

Blowing in Cellulose Insulation

Use a cellulose insulation blower to inject the insulation into the walls through the drilled holes. Start by blowing insulation into the top section of the wall, working your way down to prevent settling or sagging. The insulation should fill the walls to the recommended R-value, typically R-19 to R-30 for most applications. Use a vacuum hose to remove any excess insulation and clean up any spills or mess.