We had a customer who had cold floors and frozen pipe issues in the past.
We removed the plywood, and existing fiberglass insulation under the floor in the area below the kitchen and the bathroom. We air-sealed all penetrations and gaps. We insulated under the open floor joist. We installed plywood over the open joists and then dense-packed it with TruSoft insulation.
The result was a warmer floor and no frozen pipes all winter!
Before the insulation project was started
The old fiberglass insulation removed
Air sealing the gaps
Holes drilled to allow dense packing with TruSoft insulation
Showing the air sealing of the gaps
Another angle of the sealing performed
Fully insulated with plywood
The finished product! Happy customer and warmer floors