Spray Polyurethane Foam (SPF) insulation is a highly effective material for enhancing building energy efficiency and comfort. Understanding the distinctions between its two primary forms – open-cell and closed-cell – is crucial for making the optimal choice for any construction project. As a dedicated polyurethane foam insulation manufacturer, we provide clarity on these differences to help our clients make informed purchasing decisions.

Both open-cell and closed-cell SPF are created through a chemical reaction of two liquid components. However, the resulting cellular structure and properties vary significantly, leading to distinct applications and performance characteristics.

Open-Cell SPF Insulation:

  • Structure and Density: Characterized by a soft, flexible, and spongy texture. The cellular walls are broken, allowing air to fill the cells. This results in a lower density, typically around 0.5 lbs/ft³.
  • R-value: Offers an R-value of approximately R-3.5 per inch, providing good thermal insulation.
  • Moisture Permeability: It is permeable to moisture and air, which can be advantageous in certain wall systems to allow for drying. However, it is not recommended for areas exposed to bulk water or high humidity without additional vapor barriers.
  • Acoustics: Excellent sound dampening properties make it ideal for interior applications where noise reduction is a priority.
  • Cost: Generally more affordable than closed-cell foam, making it a cost-effective solution for many projects. When you buy polyurethane spray foam insulation of this type, you often achieve significant savings.

Closed-Cell SPF Insulation:

  • Structure and Density: Features a rigid and dense structure with intact, sealed cells. These cells are filled with a blowing agent that contributes to its high insulating value and density, typically ranging from 1.75 to 2.25 lbs/ft³.
  • R-value: Delivers a higher R-value, usually R-6 to R-8 per inch, offering superior thermal resistance in a thinner profile.
  • Moisture and Vapor Barrier: Acts as an effective moisture and vapor barrier due to its impermeable nature, preventing water and air infiltration. This makes it ideal for foundations, basements, and roofs.
  • Strength and Rigidity: Provides structural integrity and can increase the racking strength of walls.
  • Cost: Typically more expensive than open-cell foam, but its enhanced performance in critical applications often justifies the higher polyurethane insulation price.

Choosing Your SPF Solution:

The choice between open-cell and closed-cell SPF depends on specific project requirements, budget, and environmental conditions. For applications prioritizing soundproofing and cost-effectiveness, open-cell is often suitable. For areas requiring robust moisture resistance, higher thermal performance, and structural support, closed-cell is the preferred choice. As a leading polyurethane spray foam supplier in China, we offer both types of high-quality SPF. We encourage you to contact us to discuss your project needs and to obtain a quote. Partner with a reliable manufacturer to ensure your insulation investment delivers maximum value and performance.