If you want to save money on your power bills and you know your home needs more insulation, then having spray foam added to your exterior walls and attic might be a good choice. Installing spray foam in your attic is a simple process for the contractor since the foam is just sprayed on from a hose. Installing the foam in existing walls is a little different, especially if you want to avoid tearing open the walls. Here are some things to know about spray foam insulation installation in existing exterior walls.
The Foam Can Be Installed From Either Side
Your contractor may install the spray foam from the outside of your home so there is less disruption to you. However, the foam can be installed in wall cavities from outside and inside the home. In both cases, it's necessary to drill several holes in the wall. There is a hole for each wall cavity. The hole is plugged and covered when the job is complete so the holes become invisible.
When you get your quote for the estimate, you can decide along with your contractor which way you want the spray foam to be installed. Consider how much trouble it would be for you for the crew to work from the inside before making your decision. The contractor can probably install the spray foam from the outside, no matter what type of siding you have on your home.
The Access Holes Are Filled And Hidden
If your home has vinyl or aluminum siding, the contractor may remove a panel along the wall so the siding isn't disturbed during the process. This allows the contractor to reach the wall to drill holes along it. When the foam is installed, the siding panel is put back in place so all the work is hidden.
If you have a brick home, the contractor drills access holes in the mortar. The holes are then filled with new mortar and once the mortar is dry, the holes aren't noticeable. Your contractor makes sure the holes will be nearly invisible or completely invisible when the work is done or they may opt to work from indoors.
Spray Foam Can Often Be Used With Other Insulation
If your exterior walls already have cellulose or fiberglass batt insulation, the contractor might still be able to add spray foam insulation to the wall cavity. If the insulation is packed in too tight, it might not be possible to add spray foam, so the contractor has to look at your individual case. However, if you have an older home with fiberglass batt insulation that might be compressed and ineffective now, then spray foam might be a suitable choice for applying over the top of the old insulation.
For more information about spray foam insulation installation, contact a spray foam installation contractor in your area.