Quick Answer
Spray foam insulation and rigid foam insulation are ideal choices for underground homes due to their high R-values, moisture resistance, and ability to withstand pressure.
Choosing the Right Insulation for Underground Homes
When it comes to insulating underground homes, the primary goal is to create a barrier that can withstand the pressure and moisture of the soil while maintaining a comfortable indoor temperature. Spray foam insulation and rigid foam insulation are top contenders for this task, thanks to their exceptional R-values and moisture-resistant properties.
Spray Foam Insulation: A Popular Choice
Spray foam insulation offers an impressive R-value of R-6 to R-7 per inch, making it an ideal choice for underground homes. Its ability to expand to fit tight spaces and its resistance to moisture and pests make it a popular choice among builders. When used in conjunction with a vapor barrier, spray foam can provide a reliable and effective insulation solution for underground homes. It’s recommended to use a 1-inch to 2-inch thick layer of spray foam insulation in underground walls.
Rigid Foam Insulation: A Cost-Effective Alternative
Rigid foam insulation, also known as extruded polystyrene foam (XPS), offers an R-value of R-5 to R-6 per inch, making it a cost-effective alternative to spray foam. Its density and rigidity make it resistant to compression and deformation, ensuring consistent performance over time. Rigid foam insulation is also easy to install and can be cut to fit tight spaces. When used in conjunction with a vapor barrier and a drainage plane, rigid foam insulation can provide a reliable insulation solution for underground homes. It’s recommended to use a 1-inch to 2-inch thick layer of rigid foam insulation in underground walls.
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