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There are several types of foam, including extruded, closed cell and open cell. The closed cell and extruded foams are usually water resistant or water proof, and the open cell allows water to pass through.Yes. Is Styrofoam similar? It looks like “pockets” under the microscope.
From my memory of “that bathroom foam”, it was cushy, squishy (I understand why it is used for sound insulation), but surprisingly, it poorly absorbed water. For my purpose, it was OK (no wet floor in the bathroom). If you splash water on it, most stays on the surface. Am I right?
If I am right, then there may be one more negative quality of it; when burning, material that poorly absorbs water is not good. Imagine something burning inside but water stays on the surface.
Styrofoam is closed cell and extruded, and is waterproof. It is stronger than other foams.
Styrofoam - Wikipedia
We don't know what was used on the nightclub ceiling in Crans-Montana.
Open vs. Closed Cell Foam: Understanding Permeability
Open and closed cell foam are suitable barriers, but differ in structure and permeability. Read more to find out which foam is best for your project.