Wood – Subfloor rot fix

wood

I'm starting a complete master bath remodel and have gutted everything. I have a small spot (about 4" x 6") where the sub floor has rotted due to water damage from a shower. The sub floor is 3/4" thick so there is a lot of wood still under the rot area. My question is, I'm about to tile over it and I want to fix the wood rot area first, what's best to do this? Considering that I'll be putting down thinset mortar. Was thinking of patching and sanding with something like durham's water putty?? Or should I use something else?? Thanks

Best Answer

Definitely NOT water putty. It'll crumble and turn to dust under the tile. Would much rather see you use thinset mortar, if you aren't going to repair it with wood/cement board. Put some mesh in the mortar, if you have any available. Any kind of mesh, or old window screen.