When comparing roof insulation materials, make sure you look at the R-value (the number that indicates the insulating value) and other important properties. For example, consider how much the material will cost and whether it’s suitable for the climate where you live. It’s also important to check the material’s resistance to moisture as humidity can affect its performance and durability.

Most people think of fiberglass when they think of roof insulation, and for good reason — it’s the most common and least expensive option. It is available as blanket (batts and rolls) and loose-fill insulation, which can be easily installed by homeowners.

Discovering the Best Roof Insulation Materials for Your Needs

Mineral wool is another eco-friendly choice that’s made from recycled materials, such as rock and slag, with no added chemicals. It’s fire-resistant, durable and has a high R-value. It’s also available as a blanket (batts and rolls) or as loose-fill insulation, but it doesn’t offer the R-value of fiberglass or other rigid materials.

Spray foam is becoming increasingly popular as it has a higher R-value than many other rigid insulation materials. It is partially composed of polyurethane, which is moisture-resistant and effectively seals cracks. It’s available in open and closed-cell sprays and is generally more expensive than other insulation options, but it also has a high energy-saving potential and can help with air quality issues by eliminating moisture.

Structural insulated panels, or SIPs, are flat panels that feature an insulating foam or polystyrene sandwiched between plywood. They’re a strong thermal insulator and provide extra structural support for the home. However, they are difficult to install and more costly than other roof insulation models.