Open-Cell vs. Closed-Cell Spray Foam: What Works Best for Michigan Homes?

Choosing between open-cell and closed-cell spray foam insulation isn’t just about cost—it’s about performance, climate and long-term comfort. At Mid Michigan Spray Foam, we help homeowners across the region select the right product for their home’s structure, energy goals and environmental exposure. 

What’s the difference between open-cell and closed-cell spray foam?  

Open-cell spray foam is lighter, softer and more flexible. Its open structure allows some air and vapor permeability, making it a great option for interior walls and soundproofing. Closed-cell foam, on the other hand, is denser, more rigid and moisture-resistant. Its tightly packed structure gives it higher R-values and adds structural integrity. 

Which insulation is better for Michigan's climate?  

Closed-cell spray foam typically performs better in Michigan due to its moisture resistance and higher R-value per inch. Our cold winters and humid summers make vapor control and insulation performance a top priority—and closed-cell excels in both. That said, open-cell can be a smart, cost-effective option for above-grade interior walls or rooms needing soundproofing. 

Where should each type be used? 

• Closed-cell: Ideal for basements, crawl spaces, attics and exterior walls. It provides an air barrier and acts as a vapor barrier. 

• Open-cell: Best for interior partition walls, ceilings and some attics where moisture control is less critical. 

Does cost matter? Open-cell foam is generally more affordable, but may require greater thickness to match the insulation values of closed-cell. While closed-cell is a larger upfront investment, it delivers long-term value through energy savings, durability and moisture protection. 

Still unsure? Let us help. At Mid Michigan Spray Foam, we assess every property individually. Our team will help you choose the right spray foam based on your home’s needs and budget—without compromise.