[markdown]

> stopping termites from entering the building.

Do the termites in your location not fly? In Fiji we have termite swarms once a year. Millions of them will show up at every light they can get to in the evenings. Everyone is advised to turn off their lights for a few hours and light a fire outside so as to get the termites to kamikazi. These are the Asian Subterranean Termites that arrived here via Australia.

Pesticide in a ditch around a house isn't going to stop these buggers.

[Gibbon1]

The idea is the poison kills them if they set up a nest next to the foundation.

[basicplus2]

Termites only fly when a colony has reached a limit on number, and pairs fly off to start new colonies.

unless they start a new colony inside the barrier, the barrier is still effective.

[markdown]

The barrier is only affective against burrowing, but termites don't start new colonies by burrowing. They swarm (usually once annually)... fly off and build new colonies. If only the method described here actually worked, we'd save billions of dollars a year in damage.

[dd36]

Subterranean termites.