Open Cell vs Closed Cell Foams: A Complete Guide

Foam insulation is a fantastic way to boost your property’s comfort and energy efficiency. It helps keep your indoor environment cozy, reduces energy bills, and improves air quality. That’s why choosing the right type of foam insulation is crucial to getting these benefits. 

This article covers the differences between open and closed cell foams so you can make an informed decision and maximize your insulation. Keep reading to find out which foam might be best for your needs.

What is Open Cell Foam?

Open cell foam is spray foam insulation with intentionally left open cells. This feature makes the foam less dense and more flexible. It is ideal for residential settings where soundproofing and cost are essential factors. Some benefits include:

  • Effective soundproofing
  • Cost-effective
  • Greater air movement, reducing pressure on walls
  • Environmentally friendly options available

What is Closed Cell Foam?

On the other hand, closed-cell foam has completely closed cells. This makes it denser and more rigid. It’s often used when moisture resistance and higher insulation values are necessary. Some benefits include: 

  • Superior moisture resistance
  • Higher R-value for better insulation
  • Adds structural strength to walls
  • Acts as a vapor barrier
  • Long-lasting durability

Key Differences to Consider

Open-cell foam and closed-cell foam have several key differences that make them suitable for different applications. These include:


The main difference between these materials is their density. Open-cell foam is less dense, making it lighter and more flexible. Closed-cell foam is denser, providing rigidity and added structural support.


R-value is a measure of insulation’s ability to resist heat flow. Open-cell foam has a lower R-value, offering less insulation per inch. Closed-cell foam has a higher R-value, delivering superior insulation.

Moisture Resistance

Open-cell foam allows some moisture to pass through, which can help with moisture control in certain conditions. Closed-cell foam acts as a strong moisture barrier, preventing water and vapor from getting through.


Due to its simpler manufacturing process, open-cell foam is generally more cost-effective than closed-cell foam. However, the long-term benefits, such as energy savings and durability, may outweigh the initial difference.

Which Foam Is Right For You?

Open and closed cell foams have unique benefits, so choosing the right one depends on your needs and foundation. Here are some recommendations:

  • Consider your local climate and how much insulation you need.
  • Be mindful of your budget, as costs can vary.
  • Think about whether your property is prone to moisture problems.
  • Determine if you need flexibility or rigidity in the insulation area.
  • Check for eco-friendly options that meet your sustainability goals.

Make the Right Choice for Your Insulation Needs with Foam Expert Group

Choosing between open-cell and closed-cell foam can be confusing, especially when dealing with moisture issues and high energy bills. Nobody deserves to feel overwhelmed by these challenges. 

At Foam Expert Group, we understand your concerns and are here to assist you. We’ve helped dozens of clients in similar situations find the perfect insulation solution- let us do the same for you! Ready to make your home more comfortable and efficient? Reach out to us today!


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