Termites play an essential role in nature. The only problem is that they can't be distinguish between a dead tree and a floor joist.
PHOTO: OSF/J. COOKE/ANIMALS ANIMALS
Colonies can have a quarter-million members. There is almost a ton of termites per person on earth.
DONALD SPECKER/ANIMALS ANIMALS
Diagram 2: Foundation insulation.
Diagram 1: Slab penetration.