Take the 2-minute tour ×  I live in Austin, Texas, which is
important in that we don't receive much rain, and it's not very
humid.  I was peeling paint off of the old drywall, and found
what appears to be mold on the bottom of one of the exterior
walls of my room. Some of it is beneath a window, but some is
offset two feet or so on the other side of the same window.
Some of it coincides with what I believe to be old termite
damage. It's clearly been patched, and the infestation is
definitely inactive.  My suspicion is, since it's an old house,
that there is no vapor barrier, and the mold is the result of
condensation. I suppose it could also come from a leak in the
window. The previous homeowner blew in insulation, and my
understand is that without a vapor barrier, that can cause some
condensation problems.  Is it worth it for me to just tear out
the drywall, add a vapor barrier along just the one side of the
room, and then insulate it? Or should I use some bleach to clean
up the mold damage, cover it over w