How to Install Wall Cavity Insulation

What You'll Need
Protective clothing
Safety glasses
Hole saw
Drywall mud
Wall primer and paint
Electronic stud finder
Mechanical insulation blower
Aerosol expanding foam sealant

Insulating an existing home can be done easily with the use of blown in wall cavity insulation. There is no demolition job that will be required and holes that are drilled into the inside walls can be repaired easily. With the aid of a helper, you will be able to insulate a small sized to average house in one weekend. What is more, you do not have to pay for the astronomical fees that are asked by contractors.

Step 1 - Finding the Wall Studs

Find and mark the studs that are installed along the exterior walls. You can make use of an electronic stud finder in order to find them easily. Mark the edge of each studs around 6 inches away from the ceiling with a pencil you are going to blow the insulation in on the stud bays, which are the areas that are between the wall studs. If there are light fixtures installed on a stud bay or if you have a chimney, do not blow a cavity wall insulation in. When combined with the insulation, the heat from such locations can cause a fire.

Step 2 - Drilling Holes

Locate the center of each stud bay and drill a hole in it. This should be at the middle of every stud that you have marked and about 6 inches from your ceiling. The hole should be around 1/8 inch larger the insulation blower nozzle. Use a hole saw for this task.

Step 3 - Blowing the Insulation In

Place the blower nozzle into a hole on a stud bay. Seal the nozzle to the wall by wrapping a rug around it. The rag will prevent insulation from coming back out of the stud bay hole. Holding the nozzle and rag into place, ask your helper to start the machine to blow the insulation in. once the machine starts sounding like it is making a struggle and insulation is stopped from being blown in, your wall cavity is full. You can have your helper stop the motor.

Step 4 - Insulating the Other Stud Bays

Insulate the rest of the stud bays by repeating step number 3 on each.

Step 5 - Patching the Holes

Patch the holes you drilled by pushing the insulation back into the cavity and away from the hole with your finger. Make a small indentation and fill it up with an expanding foam sealer. Keep it up until the foam forms a mushroom out of the hole.

Step 6 - Flushing the Sealing Foam

Once the sealing foam has dried sufficiently, get a serrated bread knife and use it to saw off the foam mushroom, flushing it with the wall.

Step 7 - Filling the Surface

Use drywall mud to cover the foam with several thin coatings. You can make use of a drywall putty knife to apply it. Use the foam to cover any irregularities and indentations until have a smooth wall surface.

Step 8 - Sanding the Wall

Once the drywall mud has dried out, sand the surface lightly with medium grit sand paper. Prime and paint the holes you have patched.