Some toilets are sealed with silicone after installation, with some gap
on the back of the toilet, to let seeping water escape, rather than
leak to the lower floor. Does it also serve the purpose of preventing
the water on the floor (e.g. if the tub has overflown) from entering
the under-toilet space?
the toilet. We are first floor, on slab, so I suppose the idea is that
the grout prevents any movement and that caulk might allow slight
movement. As for your question, silicone around the toilet would help
keep water from seeping down to whatever is below....I also caulk around
baseboards for the same reason. In kitchen or bath, there will
eventually be leaks, overflows or spills....keep the water contained as
much as possible.
What happens if the wax seal leaks?
By caulking completely around the toilet there will be no witness
The water will be contained within and leak into the subfloor, framing
and ceiling below.
I personally don't think where a toilet or baseboard meet the floor should
be sealed with anything. Any occasional accidents will dry. Frequent
accidents need to be addressed and not Band-Aided.
Where the tub meets the flooring I do caulk.
It is also to keep nasty looking visible black grunge and/or mold from
getting started in a nearly uncleanable crevice. Males with bad aim and
general bathroom humidity and condensation can get things started even
without a tub overflow or toilet leak.
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