| Re: Mattress Sponge as sound insulation and absorption?
I guess cotton can be as good if not better than fibreglass. There are few manufacturers of recycled cotton insulation.
I guess the factor you would have to consider with using raw mattress foam or untreated cotton is it's flammability. Your studio, if it ever caught on fire, could become a death trap that burns to the ground in a matter of minutes. Most North American products have to pass certain standards so that if the building ever did catch fire, the people would have enough time to get out.
You could use cotton and spray it with Borax and water to make it less flammable.
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