I recently discovered a very slow toilet leak (only when flushing), which has dampened the bathroom floor, and dripped onto the basement ceiling, where there is now a pretty mold spot.
A restoration company gave me a quote to remove the floor in the bathroom, the affected area of the ceiling, and 12 inches (31cm) of drywall along the base of the bathroom floor.
My question is: How important is it to replace all the drywall (both on the bathroom walls, and in the basement ceiling)? The quote was to remove the area with > 13% moisture.
Is this strictly necessary?
I'm concerned about the structural integrity of the wall and ceiling, as well as any possible health implications, since the leak was used toilet water. As the water had to wick into the walls, from the floor, I suspect the water there should be "relatively" clean, but the leak has also been going on for quite some time apparently, so who knows what's been growing in that water.