Open vs. Closed-Cell Spray Foam Insulation & Benefits of Each
Most spray foam insulation comes in two kinds: open cell and closed cell. Natural-Therm comes in both of those types, plus one more: hybrid cell—or zero cell. When choosing which type of spray foam insulation would be good for your project, there are several things to consider. We’ve tried to make that decision as easy as possible with the breakdown below. Compare open-cell vs. closed-cell spray foam, open-cell vs. zero cell and closed-cell vs. zero cell as they pertain to R-value, strength, cost and more, with help from the spray foam technicians and developers at Natural Polymers, LLC.
OPEN-CELL VS. CLOSED-CELL SPRAY FOAM
CLOSED-CELL FOAM
OPEN-CELL FOAM
OPEN-CELL VS. ZERO-CELL SPRAY FOAM
CLOSED-CELL VS. ZERO-CELL SPRAY FOAM
USING CLOSED-CELL, OPEN-CELL & ZERO-CELL INSULATION
Closed-Cell
Spray Foam Insulation
• Higher R-value per inch, better for tighter spaces
• Better for basements, crawlspaces, and exterior spaces
• Rejects large amounts of water, ideal for flood zones and leaks
• Adds strength to wall racking
• Less permeable for air, pests, moisture, heat
• Strongest structure

Open-Cell
Spray Foam Insulation
• Lower cost than closed-cell
• Better for interior spaces like walls and attics
• Ideal for filling large voids
• Stands up better to movement such as seasonal shifting
• Hydrophobic structure

Zero-Cell
Spray Foam Insulation
• More suitable for application where a harder foam is desired
• Hydrophobic structure
• Considered a low GWP product
