This type of sprung floor has three layers.
The squares are about three inches square. And are glued to the
plywood. A tongue and groove edging on the ply means zero screws. Either
it runs to the wall or has blocks (like mini-ramps) on the sides to hold it
together.
The floor can be permanently installed or used as a portable surface. Good
sound, the Tapper's love it. The Good News is that it is wonderful for
dancing on!
Left Corner
Floor with cushion support