I plan to build a storage room and home theater out of our rec room in the basement, but I have a couple of questions about this. I am planning to lay a Platon floor with chipboard over it.

1. What should I do first? Lay the floor or build the partition wall? It's easiest to lay the floor first, but I heard it might be unwise to build a wall on top of a floating floor. How do you attach the wall to the floor without making holes in the Platon membrane?

2. How do you best build a soundproof basement wall so that it doesn't absorb moisture from the side walls?

Hope someone here can steer me in the right direction.

/Magnus
 
Not there yet, but my interior walls in the basement are intended to be made of 9cm masonry leca. Don't know how the sound insulation will be, but it should be tight at least. And in my case, wall first.
 
It depends a bit on how you plan to build, but if you have a concrete ceiling, you can attach the wall firmly there.
Since you mention Platon, I assume you have a slab on grade or other moisture coming in. It is then better not to build the wall on the slab since moisture can then travel up into the wall.
I would rather build the wall on the floating floor...
 
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