Does the vinyl really absorb sound?
You'll notice that Eric specifically said 'mass loaded
vinyl'; this is something else I'd not heard of before (I've learnt a lot from this thread!), but, courtesy of Mr Google, there's now no question in my mind that mass loaded vinyl is the 'lead substitute' material in my layered foam soundproofing that I mentioned earlier.
He said to use mass loaded vinyl for the floor. For the walls he said to use upholstery foam with cloth or vinyl over it. I'm fairly certain he meant upholstery vinyl for the walls.
My question is would upholstery vinyl really help absorb sound?