Flutter Echo
As something of a technical aside, this stage of the construction is very useful for demonstrating (and then fixing) a very annoying problem in acoustics. This problem is known as Flutter Echo, and if you are not aware of what conditions cause this problem, then its appearance and solution will be a mystery to you.
Take a look at the following picture showing the insulation applied to the inner walls. Notice where there is no insulation. None has yet been applied to the ceiling and obviously, none will be applied to the floor.
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