I previously asked here about replacing exterior wall structural
members after a termite infestation (http://tinyurl.com/kwndug) and
I've finally gotten around to actually doing the work.

Although the termites were probably attracted to damp/wet wood resulting
from "tub" leaks somewhere, you still have to find out where they gained
access to the structure. From the shoddy build method used, I wouldn't be
surprised if the outside stucco extends DOWN below grade (into the
soil/backfill). Ideally, there should be up to 6" of visible concrete
foundation below the bottom edge of the stucco. That way, termites would
have to build 'tubes' creeping up the concrete to get to the wood structure.
If the stucco and paper is below grade, they have ready access to your
walls.

I've seen properly built walls with the foundation "reveal" be
backfilled/covered by landscapers to a depth where the soil/mulch is then
lying against the stucco.

Looking at the "inside" pictures, I can't guess what there is outside at
ground level but I'm guessing NO concrete ?

BTW, In the development where I built in 1998 (AZ ground infested with
termites), I sprayed all the lower 4 feet of the 2X6 framing and OSB
sheathing, in & out prior to application of the construction
paper/foam/wire/stucco with TIMBOR solution. After the initial commercial
termite application (DURSBAN 1%-several hundred gallons used) I bought
DURSBAN from the local builders supply and every two years or so, would
spray 1% all along the outer foundation, with a heavier application where I
knew there were foundation penetrations. After 5 years, I had no termite
problems. The neighbors (frame) home next door (I watched a shoddy termite
pre-treat done) had termite "tubes" up & into the walls before the house was
even finished and they persisted, even up to the roof structure needing
remedial work every year for the "5". Another neighbor with a CBS home had
the termites eat their way up the inside of the sheetrock "paper" and even
came thru the walls into/ and 'ate' picture framing hanging on the walls. I
would guess that had a lousy termite Pre-treat there too.

BTW2, I think TIMBOR is still available but DURSBAN had been 'banned"