If you have time.
How to repair particle board floor.
To remove damaged sections of particle board subflooring.
Determine the location of the floor joists using a stud finder or by the seams in the existing.
Affix the broken piece if the piece is still attached to the particle board then dry fit it first to determine how well it will sit.
Wear an approved respirator or dust mask safety glasses and earphones or earplugs before cutting into a.
Use an electric sander equipped with a dust bag to sand large areas.
How to repair water damaged particleboard.
Dry the wet spot by using a hair dryer.
Then fill the glue injector with the wood glue and apply it where the piece broke off as well as on the piece itself.
Wait several minutes for the wood glue to get tacky and press the piece in place.
Using a heat gun may create temperatures that could ignite the particleboard.
Sand the water damaged area with a medium grit sandpaper by hand or by using an electric sander until.