Closed Cell
Closed cell spray foam is just the opposite, with no air or space in the cells. This rigidity is more robust, firmer, and even helps strengthen the integrity of the structure it’s insulating. That means if you insulate your attic with closed cell, the walls will be stronger and sturdier than that of open cell insulation.
- Very energy-efficient with proven energy savings of up to 50%
- Provides an airtight seal
- It’s water-resistant and deters mold
- Longer lifespan than open cell foam
- Strong enough to provide structural support wherever it is installed
- It has a very high density and weight
- Not very breathable
- Loss shock absorption than noise-reducing open cell
Open Cell
Open cell spray foam is more flexible and softer than closed cell because it has more space between the cells—kind of like air bubbles or gaps. While this type of spray foam can be more susceptible to holding water or moisture, it can be easier to manage and fill spaces since it’s not as rigid as closed cell.
- Ideal for hard-to-reach areas
- It expands almost 100x more than its size when applied
- More flexible than closed cell spray foam
- Noise reduction properties
- It’s very lightweight
- Not ideal for extreme temperatures
- Won’t help with structural support
- It can shrink over time and require re-insulation