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Plumber to solve the clogging issue - might be solved by simple snaking, or might take pulling the toilet off the flange and checking the pipe visually.


You shouldhave gotten a plumber on this issue after the first overflow, because the more water you get in the subfllor the more rot you will have. As far as the water damage from the overflow, if this was mopped up immediately after the overflow, have the plumber check the wood he can see if he pulls the toilet, to see if you have wet or rotted framing in the floor. If not pulling toilet, then you can use a fiber optic inspection viewer to look in from the downstairs ceiling, or cut a small hole in the drywall to inspect for wetness or rot in the subfloor. IF rotted or heavy mold, need repair. If just wet, then you can put a shop vac hose in there taped to holdin place (or hung by string from floor joists) and let it run until area is totally dry to the eey - will take several moves around in the area to get all areas. Works FAR better on blowing mode then on vacuum mode.


IF you have delaminated subflooring or heavy mold or any noticeable rot or fungal growth, then you need a general Contractor or a Smoke and Water damage remediation contractor to do some selective demolition and repair of the flooring and subfloor.


Other than blowing it out to dry it and stop rotting, I would not do anything about the flooring until you are sure the plumbing issue is fixed.