Here’s a simple comparison of common insulation types:
Fiberglass Insulation: R-Value: 3.2 per inch | Efficiency: 32% | Example: 3.5 inches in a wall gives about R-11.2
Note: Can collect moisture, reducing effectiveness.
Open-Cell Foam Insulation: R-Value: 4 per inch | Efficiency: 44% | Example: 3.5 inches in a wall gives about R-13.7
Note: Can collect moisture, reducing effectiveness.
Closed-Cell Foam Insulation: R-Value: 7 per inch | Efficiency: 92% | Example: 1 inch in a wall gives about R-20.1, and 3.5 inches gives about R-63.7
Note: Does not collect moisture, making it highly effective.
Injection Foam Insulation: R-Value: Similar to open-cell or closed-cell options | Efficiency: Varies, typically around 40-60% | Example: Fills existing walls, improving insulation without major renovations
Note: Effective for retrofitting but varies based on foam type used.
Mineral Wool Insulation: R-Value: About 3.7 per inch | Efficiency: Generally high | Example: 3.5 inches in a wall gives around R-12.95
Note: Fire-resistant and does not collect moisture, but can be more expensive.
Closed-cell foam offers the highest R-value and efficiency with no moisture issues, while injection foam is great for upgrading insulation in existing walls. Mineral wool provides solid performance and fire resistance.