What are the advantages and things to consider when sealing the attic of a house with spray foam insulation? -Mike
The biggest advantage to applying spray foam insulation to the rafters in your attic is that you’ll be creating a more energy efficient envelope around your home, which means you’ll be spending a lot less energy and dollars on heating and cooling.
However, you’ll need to take into consideration:
- Cost: Spray foam insulation isn’t a DIY project and it’s a very expensive upgrade. Unless you plan on being in your home for many years, adding more fiberglass or cellulose insulation may be more cost effective.
- Existing Insulation: Any insulation between the ceiling and the attic will need to be removed when installing spray foam insulation on the rafters.
- Attic Ventilation: Any gable, soffit, louver, or power vents in the attic will need to be removed or sealed shut, since the entire attic area will be turned into conditioned space.
- Windows: A well-insulated and sealed attic will have only minimal effect if you still have leaky, single-pane windows.
Good luck with your project,
- Insulation R-Value (article)
- Foam Insulation Increases Energy Efficiency in Your Home (video)