How to repair the sub floor under a leaky toilet.
How to repair floor under toilet.
Clean the flange well or use a new one and install over the drain and new wood.
But if your floor is severely rotted say more than an inch beyond the flange you re stuck replacing the flooring around the toilet.
Peel back the flooring around the fixture and you will.
If only the area directly below the flange is rotted you can install a two piece steel closet flange support.
It goes under the flange and transfers the load of the flange and toilet and you out onto more solid surrounding wood.
How to fix a rotten floor around the toilet.
You may need to scrape the flange with a small putty knife and use a wire brush to get it clean and free of any corrosion or debris.
A spongy floor around the toilet is a strong indication that the subfloor has absorbed water.
Make sure to make your nails flush with the wood.