The major advantage of using foam insulation to deaden unwanted exterior sound in your home is its easy installation. It can be installed in your existing walls without demolishing or damaging your drywall. Installers can remove a siding panel, drilling a hole in the stud cavity. They can then inject the foam. By skillfully moving the hose from top to bottom, your installation team can be sure that the cavities are full of foam. Then the crew members close up the hole and replace the siding panel. Injection foam is used successfully in both external and internal room walls. When used between the drywall, it can lower the noise level from one room to another significantly. Spray foam insulation is a good choice for dampening sound through a ceiling if you have an attic in your home. The attic roof deck is usually insulated, yet that does not guarantee that the attic floor cannot be insulated as a choice. Your final decision will be dependent on what you are using the attic for. It will be based on what you use the attic for today and whether you wish to have it sealed off from the remainder of your home.