Understanding The Difference Between Open-Cell and Closed-Cell Foam For Insulation

Density

The biggest difference between the two types of foam is density. Open-cell foam is less dense than closed-cell foam, meaning it's more porous. This makes it better at absorbing sound and vibration, but it also means it's not as effective at blocking out air and moisture.

Closed cell foam is dense, making it better at blocking out air and moisture. However, this also makes it more expensive and harder to install.

So, which type of foam should you choose for your home? It depends on factors like your needs and budget. Open-cell foam is a good choice if you're looking for an affordable option that will still provide good insulation. If you need the best possible insulation (and are willing to pay for it), closed-cell foam is the way to go.

R-Value

R-value is a measure of resistance to heat flow and is important for determining the energy efficiency of a material. The higher the R-value denotes the material's good insulation and vice-versa.

Open-cell foam has an R-value of about 3.5 per inch, while closed-cell foam has an R-value of around 6.5 per inch. This means the closed-cell foam is better at resisting heat flow than open-cell foam. 

The improved insulation of closed-cell foam can be attributed to its structure. Closed cell foam comprises cells that are completely sealed off each other, while open cell foam has cells that are only partially sealed. This allows the closed-cell foam to trap air better, which increases its ability to resist heat flow.

Cost

Open-cell foam is typically less expensive than closed-cell foam. The main difference between the two types of foam is that open-cell foam is less dense, making it ideal for applications where weight is a concern. 

Open-cell polyurethane spray foam insulation costs an average of $0.44 to $0.65 per square foot. This is about 50% less than the cost of closed-cell spray foam, which averages $1.00 to $1.50 per square foot.

An open cell is more permeable, allowing water and air to pass through it more easily. Closed cell foam is dense and provides a better barrier against moisture and air, making it a better choice for areas with a higher risk of water or air leakage.

Conclusion

When it comes to insulation, there are two main types of foam used: open-cell and closed-cell. It's significant to determine the difference before making a final decision. Open-cell foam is generally less expensive and easier to install, while closed-cell foam offers better insulation and is more durable. Ultimately, the best type of foam for you will depend on your specific needs and circumstances.