Stumped - Indoor flooring/Acoustic problems

Hi I am a new DIY and I am looking for a surface to put over indoor asphalt. I have looked all over for some info but can't locate any info on indoor asphalt.
Here's the problem:
The surface is indoors - an old shed that was converted by the previous owners into an aviary which I would now like to turn into a music rehersal space.
The floor is asphalt and gets very damp especially in the summer. At first I had an indoor/outdoor carpet over the asphalt and used the space this way ....uintil the mod grew. Got rid of the rugs and now am down to asphalt.
The room is damp and also very reflective so sound is bouncing all over the place.
I was thinking of laying Dri-Core over the asphalt and then laying rugs over top the dri-core for sound absorption.
My question; Can dri-core be used over asphalt in this manner? Becasue of the moisture in the asphalt, do I need a moisture barrier first?
If not Dri-Core, is there anything that *can* be used over indoor asphalt to finish the flooring so that I can lay come carpeting down.
Thanks for any advice. Joanne
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<< The floor is asphalt and gets very damp especially in the summer. >>
Before you do anything else, find and fix that problem. Gutters, downspouts, drainage, whatever, get and follow some good advice. That will widen your optuions on suitable materials you can use tremendously. Good luck.
Joe
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Put down thick plastic visqueen first , You asked before, i guess nobody knows Dry core. If you cant stop the water it will always mold.
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I believe you can buy asphalt sealer to apply, which I would do, before covering with the plastic moisture vapor barrier suggested.
Then, you should abe able to lay your carpet.
In addition, place something in the corners of the room to avoid 90 degree angles (say, hang tapestries in each corner). This will also make a bi difference.

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