Spray foam can be either open-cell or closed-cell foam insulation.
While both materials create an air seal, there are some differences between them that can make a difference in your project.
Here are some information about Open Cell:
Open cell spray foam insulation is spray-applied to open cavities in any structure. Open cell creates an air seal and continuous insulation in the existing home, new home, or pole barn. This spray foam insulation is light, pliable, and can expand up to 100 times to fill every nook and cranny where it is installed.
The structure of open-cell spray foam makes it great for use in homes on roofs or floors as it’s a breathable product and prevents timbers from rotting. Open-cell spray foam is soft and flexible foam, expanding 100x its original size and covering those hard-to-reach areas so there’s no heat loss or air leaking into your home. Another benefit to open-cell spray foam insulation is that it helps add a layer of sound insulation to your home.
And about close cell:
Due to its rigid and dense construction, closed-cell spray foam insulation is best used on metal structures. Closed-cell spray foam helps prevent air and water leaks, but it’s not great for timbers as it doesn’t allow them to breathe as open-cell foam insulation does.
Due to its high density, closed-cell insulation adds support to the structure of buildings, and its rigid density means it can resist air and water leaks. It expands to 30-50mm when applied.
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