~~~ a floating slab; where subterranean termites (and ants) can easilly enter the structure between the block wall and concrete floor (unseen/undetected signs); climbing up to the roof.

Yearly maintenance and follow-up treatments are less expensive by simply probing into the soil; rather than drilling into the block to get above the footing/below the slab.

A very important factor to consider when shopping for a house.

Drywood termites are a completely different story; they do not need any contact with the soil...

(We don't have the freeze to knock down colonies)

Just another case where some slabs are better than others...