If the pipes under your kitchen sink are exposed you may not want to fill the gaps around them with spray foam which isn t the most attractive material in the world.
How to floor under sink.
Then trace a cutting line about 3 in.
In from all four edges.
Repair any leaks under the sink immediately to prevent damages to the flooring and cabinetry.
Then cut out the middle section of the swollen sink base with a jigsaw.
Water leaks are a common occurrence under kitchen sinks.
Use a dehumidifier in the room or a cabinet dryer if plumbing repairs don t address the problem of.
Plywood to the interior size of the sink base.
Protects the wood and easy to take out dry the wood under it and put back if a leak occurs.
If left unrepaired the leaks can cause significant damage to the cabinet floor by promoting wood rot warping and mold or mildew growth.
You can protect the floor inside your kitchen sink cabinet with a sheet of vinyl flooring.
Remove the old swollen floor.
The floor inside your kitchen sink cabinet is highly susceptible to damage caused by an occasional water leak or condensation dripping from sweaty pipes.
Remove the drain lines and garbage disposer if there is one to get maneuvering room.
You can use caulk to fill gaps less than about 1 2 inch wide and you can fill wider gaps by stuffing them with steel wool and caulking over it.
Over time this can cause the wood under the sink to rot.
Then lay it to fit under the sink and flash cove it up the back and front of the space under the sink where possible.
The space beneath the kitchen sink is exposed to high levels of humidity and may even be exposed to water through leaky plumbing.
Flooring stores can probably give you waste cuts of the vinyl sheet for free.
Protect the floor with a single piece of vinyl sheet flooring.