Open-Cell Spray Foam
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Texture: Soft and spongy
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Cell Structure: Cells are open and not fully encapsulated, which allows air to fill them
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R-Value: Around R-3.5 to R-4 per inch
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Expansion: Expands a lot—up to 100x its size—great for filling hard-to-reach gaps
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Soundproofing: Excellent due to its airy structure
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Cost: Cheaper than closed-cell
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Vapor Barrier: No — it’s breathable, which can be useful in some applications
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Best For: Interior walls, attics, soundproofing projects
Closed-Cell Spray Foam
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Texture: Rigid and dense
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Cell Structure: Cells are closed and packed together, filled with gas that makes it a better insulator
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R-Value: Around R-6 to R-7 per inch — much higher
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Expansion: Expands less than open-cell
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Structural Strength: Adds rigidity and strength to walls or surfaces
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Cost: More expensive
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Vapor Barrier: Yes — blocks moisture completely
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Best For: Exterior walls, basements, crawl spaces, metal buildings, and areas with high moisture or weather exposure