This article is from the Ballet and Modern Dance FAQ, by Tom Parsons twp@panix.com with numerous contributions by others.
First, the reason for this question: A hard, unyielding surface
like concrete is a killer. To avoid injuries, you need a resilient floor.
These floors are termed "sprung floors," because the construction makes
the floor springy.
My own opinion is that this is a job best left to professionals.
But for a discussion of ways to make a sprung floor, look at
http://www.dancers-archive.com/rec-arts-dance/topics/dance-floor-FAQ.txt
which is a collection of e-mail messages discussing various aspects of
making, finishing, and maintaining dance floors.
 
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