9 Best Foam Board Insulation 2025 in the United States

The Owens Corning 703 Rigid Fiberglass Board is a solid choice for both construction and industrial insulation needs. It has an R-Value of 4.3, which means it provides good heat resistance and can help lower energy costs. Measuring 1 inch thick, the boards are not too bulky but still provide effective insulation. They also have a respectable Noise Reduction Coefficient (NRC) of 0.7, making them suitable for soundproofing in applications like professional studios or DIY projects.

A significant advantage is its fire rating; it meets Class A or Class 1 per ASTM E84 standards, making it a safe option in terms of fire resistance. The boards are also eco-friendly, containing about 53% recycled glass content, which is a plus if you're looking for sustainable options. However, one area where it could be improved is its moisture resistance. Being fiberglass, it isn’t as moisture-resistant as some foam boards, which might be a consideration in very humid environments.

Additionally, while it offers good compressive strength, it's not as robust as some other materials like extruded polystyrene. Therefore, it might not be the best choice for areas with very high load demands. Despite these drawbacks, its sound absorption capabilities and fire safety features make it a versatile and reliable product for a range of insulation needs.

The Owens Corning 703 Semi Rigid Fiberglass Board offers significant advantages in foam-board insulation, particularly with its high R-Value of 8.7, which effectively reduces heat transfer, making it a strong option for thermal insulation.

The material type being fiberglass ensures good sound absorption, highlighted by its Noise Reduction Coefficient (NRC) of 1.0, which is ideal for both professional studios and DIY acoustic projects. With a thickness of 2 inches, it provides substantial insulation while remaining manageable to install. The product also boasts a high fire rating of Class A or Class 1 per ASTM E84 standards, ensuring safety in various applications.

Additionally, the use of 53% recycled glass content is a positive aspect from an environmental standpoint, making it a more sustainable option. This insulation board is highly effective for both thermal and acoustic insulation with strong environmental credentials and fire safety.

The Johns Manville Duct Insulation is a fiberglass-based product designed primarily for thermal insulation. It boasts an R-value of 4.2, which indicates decent thermal resistance, making it effective for maintaining temperature control. The material is fiberglass, known for its good insulating properties, though it can be irritating to handle without proper protection. The thickness is 1.5 inches, providing a good balance between insulation and space efficiency.

The product comes in a substantial roll covering 100 square feet, which can be practical for large projects. It features a foil scrim kraft jacket that adds to its moisture resistance, although fiberglass can still be vulnerable to moisture over time if not properly sealed. The fire rating meets several standards (ASTM, UL, NFPA), ensuring it offers a degree of safety against fire hazards.

The environmental impact of fiberglass may be a concern due to its production process and recyclability. The fiberglass generally provides moderate compressive strength, suitable for duct insulation purposes.