for years the Pesticide industry has not been required to completely treat the foundation and slab of a home. Now all they have to do is treat the lower 3 feet with a borax solution. Trouble is that termites can eat and die a path through it till they reach fresh wood. Moisture helps them stay in the wood without having to return to underground. Water probably leaked all the way down that side. Once a year inspection might have seen it before it got too big but then again having a water leak could void any termite contract.
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