Best thing to do as already said is check the joist if its ok treat with a wet dry rot solution just to be on the safe side another thing you can do is place some 18mm ply under the bath legs and over the missing boards whilst not being a proper repair is commonly used.
Does brytons fix rotton bathroom floors.
But if your floor is severely rotted say more than an inch beyond the flange you re stuck replacing the flooring around the toilet.
Fill the void with the filler.
Mix up two part automotive filler.
Dig out any rotten wood.
How to repair damaged wood.
It didn t take much to dig up some of the flooring plywood underlayment and the 3 4 in.
How to replace a rotten floor in front of a bathtub.
Here s how we did a recent subfloor repair.
Not to leave out the tile floor above all.
See even more great ideas at www cam.
Get fair costs for your specific project requirements.
Around the toilet the floor may get flooded from overflowing.
The worst of the subfloor damage was found with a foot going through the floor.
It goes under the flange and transfers the load of the flange and toilet and you out onto more solid surrounding wood.
My toilet is in my slideout which rotted the entire floor under the toilet on the slideout the floor is 1 layer of 7 16 osb over a layer of 1 8 luan glued and screwed to and aluminum subframe.
If only the area directly below the flange is rotted you can install a two piece steel closet flange support.
Shiplap that served as the subfloor.
Pick a time to do it when the bathroom traffic will be lighter like during the summer months when people are outside more if possible and get started.
First of all you must fix the problem that created the rotten wood to start with.
Sure it will take you some work but the end result is well worth the effort.
You may not think of your floor as vulnerable but in the bathroom it is.
So do the radical surgery and put it back together better than new.
Subfloor damage in the bathroom usually comes from a leaking toilet but it can also be the result of a persistent sink drain leak or even a drip behind.
See professionally prepared estimates for subfloor repair work.
If you find that your bathroom floor has rotted through you will need to replace it.
The cost to repair a subfloor starts at 36 89 56 75 per square foot but can vary significantly with site conditions and options.
How to repair a rotted bathroom subfloor.