What is Injection Foam?

Injection foam is slightly different from the spray foam normally used in new homes. New homes that use spray foam insulation usually have SPF insulation sprayed onto the interior wall , directly applied in the cavity between 2x4's, replacing traditional fiberglass batting insulation. Excess is removed so that drywall can lay flat on top of the foam.

Many older homes that never had insulation in exterior walls, basements, or attics choose spray foam for its many benefits, including water resistance, ability to fill tight nooks and crannies, and the excellent R-value SPF can provide. Installing spray foam into older homes requires a different approach to installation in order to avoid having to remove plaster or drywall to fill wall cavities. This type of process and materials is called "Injection Foam".

Injection foam provides a convenient alternative to traditionally installed spray foam, especially for historical homes. With injection foam, a homeowner can enjoy the many benefits of a well insulated home without repairing or replacing drywall, plaster, expensive trim or the need to repaint. Injection foam also allows the homeowner to continue living in your existing home, undisturbed by the mess of construction and the disruptions of moving furniture.

Spraying injection foam into an older home requires much more precision and calculations to be sure the proper amount of foam has been put in place. This requires specialized equipment and training, so be sure to select a qualified injection foam contractor.

Your injection foam contractor will drill small holes in the exterior of your home (from the outside), inject the SPF into the wall, and repair the drilled hole. Most homes that are sided will have the siding temporarily removed in a small section before drilling the hole. When the siding is replaced, there will be no visible traces of the job. For homes with brick exteriors, the small holes are drilled between bricks, into the mortar. The mortar is quickly and easily patched once the spray foam has been injected.

Once the foam has been injected, it will expand vertically into the existing wall cavity and around any plumbing, electrical work, or windows. Your plaster or drywall will not be disturbed.