Pete A. wrote:
In either warm or cold areas it is recommended to install insulation between joists or beams in post and beam house design from R-11 to R-25. This will be installed under the sub-floor if the area is uncovered. If it is covered with sheet rock or plaster you can have cellulose insulation blown in.
A wood floor does not need to be insulated. Insulation helps the space be more comfortable to live in. Insulation helps conserve energy that would be used for heating or cooling and would pay for itself over time.
Authentic information. I'm pleased to read this.