Little leaks are really big problems!
A recent client (just outside of the Wake Forest/Raleigh, NC area) contacted us after they had an inspection done that found some water damage under the hall toilet. It was pretty bad!
We pulled back the vinyl...
...and there was some damage! Both to the lauan and the subfloor. Yuck!
We cut out the subfloor and installed some 2x blocking (not pictured) to keep all the new subfloor level with the existing.
We replaced the subfloor with new (yes, non-rotted!) 3/4" plywood and lauan, and then cut out the hole for the toilet flange. If you look in the flange cut out, you can see the 3" drain line below.
Then we got the vinly flooring back in place, set the trim for nailing in, and installed the new flange. Voila!
(Foot not included in most repairs)
So take care of those "small" leaks before they cost a bundle to repair!