- Yes, plumbers may be able to replace the subfloor.
- But more suitable professionals are handymen, carpenters, or contractors.
- Of course, you can do it yourself.
- Subfloor damage is mostly due to rot, and signs include a musty smell, squeaky floors, cracked tiles, loose fixtures, and sunken floors.
Subsequently, How do you replace a rotten bathroom subfloor? 
How do you fix a rotten floor under a toilet? 
Yet, How long does it take to replace subfloor? How Long Does it Take to Replace Subfloor? An expert will replace a subfloor in no time, especially if the room is small-sized. However, if you choose to do it yourself, it may take up to a week to remove the old subfloor and fix the new one. A small room should not take more than 8 hours to fix for a professional.
How do I know if my subfloor is rotted? How do I know if My Subfloor is Rotten? A water-damaged subfloor feels spongy underfoot. It might bounce or squeak when you walk across the room. Sagging boards, damp spots and unpleasant musty smells are also signs of a rotting subfloor.
How do I know if my subfloor is water damaged?
A water-damaged subfloor feels spongy underfoot. It might bounce or squeak when you walk across the room. Sagging boards, damp spots and unpleasant musty smells are also signs of a rotting subfloor.
What is the best subfloor for a bathroom?
Pressure treated 3/4′′ plywood subfloor is the best subfloor material for bathrooms. Pressure treated plywood is water resistant and will withstand the humid, damp bathroom environment much better than untreated plywood or OSB.
How thick should a bathroom subfloor be?
Make Sure Your Subfloor is Structurally Stable The installation guide for 1/4 inch HardieBacker recommends having wood subfloors made of 5/8 inch exterior grade plywood or OSB (oriented strand board) that is 23/32 inches thick.
How do you replace a subfloor in a bathroom?
How do you fix a rotten bathroom floor?
Here are the steps to replace a rotted bathroom floor:
- Close the water valves.
- Prepare the room.
- Inspect the areas that need replacement.
- Remove the flooring.
- Inspect the subfloor.
- Inspect the joists.
- Replace or reinforce joists.
- Replace the subfloor.
Can I replace my own subfloor?
If your subfloor is in need of replacement, the damaged portion will need to be completely cut out. This also requires the removal of all floor covering over the problem area as well as the accompanying underlayment materials. The process for this portion of the job will vary based on the type of flooring you have.
Can I put new subfloor over old subfloor?
Install a layer of at least 1⁄2” or preferably 5/8” ply over the existing planks. This is particularly important if your old sub floor has lumps and bumps in it. If you don’t respect this thickness of ply, then you’re highly likely to see rises and falls in your new flooring.