Things You'll Need

    Rubber gloves
    Drill with hole saw
    Stud finder
    Plastic straws
    Safety glasses
    Protective mask
    Slow-rise spray foam kit for existing wall insulation
    Foam saw

    Instructions
    Unpack your slow-rise spray foam kit for existing wall insulation and read the directions thoroughly to understand how to set up and use the product.

    Locate the stud in your wall with a stud finder. Drill holes between the studs equal to the size of tubing you will be using. Use a drill to make holes in the wall at the 3- and 6-foot level and 8 inches from the top of wall using a drill with a bit, or hole saw depending on the wall's internal or external surface.

    Follow the directions that came with your foam insulation kit regarding how much foam to use and how long it will take to fill the wall. Insert the tube in the lowest hole in the wall and start the flow of foam insulation. Check the level of foam inside the wall by inserting a plastic straw in the holes above to see if the foam has reached that level. When the foam comes near the next hole up, remove the tube and insert it in the next hole drilled in the wall. Repeat this until the wall is insulated.

    Scrape away the excess foam on interior and exterior walls with a foam saw. Excess foam insulation can be washed off with a hose on outside areas.

    Patch the holes with proper substances for the wall surface you are working with. Paint or replace grout, vinyl siding, or stucco to finish the project.