The article says this rotted wood could be used as a building material but isn't the very rotting that makes the piezoelectric effect more efficient also counterproductive to strong building materials?
Layers of subflooring don't all need to be structural, but they do need to tolerate heavy foot traffic, plus occasional heavy items rolling on dollys. The more give it has, the more it has to be able to return to its original state, which rotted wood isnt usually great at.
