To create a successful sound barrier, you’ll want to use a dense material that can deaden sound, preventing it from entering or leaving a room or building. The denser the material is, the more effective it will be because the sound is generally transmitted via the air. Compared to spray foam insulation and regular foam insulation materials, something denser simply contains less air.
With these two materials, mineral wool is denser than fiberglass, but there are other considerations you should factor into your decision as well.
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