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. 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.

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

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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

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Zero-Cell
Spray Foam Insulation

• Higher R-value to typical open cell foam
• More suitable for application where a harder foam is desired
• Hydrophobic structure
• Considered a low GWP product
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