Frequently Asked Questions
Have questions about insulation? There are so many questions homeowners have about insulating, air sealing, and energy efficiency. Here are some of the most common questions and answers. Have other questions? Please contact our office.
- Can new insulation be added on top of existing insulation?
New insulation can be added on top of existing. If the existing insulation is wet, it is best for it to be removed prior to adding new insulation. If insulation is wet and doesn’t dry properly, it can lead to mold, mildew, or even rotting of your ceiling roof rafters. Don’t forget if your attic has a leak, contact a roofing contractor to have it repaired.
- I’m adding fiberglass insulation to my attic. Do I need to air seal?
Fiberglass insulation is not an air barrier. It provides a thermal blanket, but does not prevent conditioned air inside the home from escaping through penetrations in the attic (e.g., chimney chases, venting, etc.). This air loss can result in increased energy use. Air sealing stops the escape of air from the home.
- What is the difference between fiberglass insulation and cellulose insulation?
Fiberglass is made from melted sand which is spun much like cotton candy. It comes in batt form that can be cut and fit into wall cavities and in loose form that can be blown into attics. Cellulose is a loose product that can be blown into attics and dense packed into closed cavities. It is made of newspaper and treated to be fire retardant.
- Can spray foam insulation be installed in an existing home?
In most cases, spray foam insulation can be installed in an existing home. Since each home is different we recommend scheduling a free estimate with one of our team members so we can provide detailed options about where spray foam can be used to improve your home’s thermal performance and comfort level.
- What is the difference between open cell and closed cell foam?
Closed cell spray foam insulation is made up of cells that are closed and packed tightly together. They are filled with gas that helps the foam rise and expand. Closed cell foam is a greater insulator due to its denser properties. Open cell spray foam insulation is made up of cells that are not completely closed. The cells are broken and air fills all the “open” space inside the material.