Important Things About Blown-In Insulation

Applying insulation to the walls is a bit more difficult than installing it in the attic because the insulation is hidden in the wall between the interior and exterior siding. Removing wall cladding to insulate wall cavities is simply not economical. 

It's cheaper and easier to drill small holes in the wall so the insulation can blow off. For this reason, blown insulation is usually the preferred choice when you need to re-insulate a finished wall. You can also get information about best blown in insulation through

Blown-In Insulation Services

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Insulating a completed wall with an insulation blower is easy:

  • Use the nail finder to find all the horizontal studs and blocks that are at or near the center of the wall height; Then mark each center and horizontal block with a blue ribbon.

  • Use a drill and drill saw to make a penetration (half between each pair of nails) in the top of the cavity, about six inches below the ceiling.

  • Save the slices of siding material that are removed from the hole saw. When the project is complete, you (or the contractor) can use it to repair the holes.

  • If the wall has horizontal or diagonal barriers, make an additional (second) penetration (midway between each pair of nails) per centimeter or slightly below the joist.

  • Since the nails are spaced every 16 inches or so, the holes for adding insulation must be equally spaced to fill one cavity at a time.

  • Remove the old sealed insulation with a vacuum.