Over time this can cause the wood under the sink to rot.
How to fix cabinet floor under sink.
In from all four edges.
Damp rotten particleboard holds water which promotes mold and mildew.
If you have a particle board floor underneath your sink that is showing signs of water damage you can tear it out and replace it to prevent the growth of mold.
Remove the old swollen floor.
Then cut out the middle section of the swollen sink base with a jigsaw.
Next cut a piece of 1 2 in.
The space beneath the kitchen sink is exposed to high levels of humidity and may even be exposed to water through leaky plumbing.
Plywood to the interior size of the sink base.
Moisture destroys the particleboard most cabinets use for the floor below a kitchen sink.
Remove the drain lines and garbage disposer if there is one to get maneuvering room.
Then trace a cutting line about 3 in.