First things first! I highly recommend doing this...
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Two layers of 1/8" closed cell foam over top of the deadener on the floor. 2x 1/8 will fit better than one layer of 1/4".
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Do the inside of the outer doorskins the same as this...
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Then 3/8" closed cell on the back wall over the sound deadener.
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Make sure it all gets rolled down after each step.
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