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There are also constructive measures to lower the risk of termites.
Make sure the wood isn't in direct contact with the soil, but rather on some kind of concrete foundation. This also makes it easier to spot the typical tunnels the termites build, and you can train the inhabitants how to spot and destry them (but they most likely know already). See a picture of these tunnels here: http://www.masseyservices.com/wp-content/uploads/2009/06/mud-tunnels1.jpg
In addition a simple "termite shield" out of GI sheet metal is easy to do and can help a lot (as it makes it very difficult for the termites to build their tunnels). See here: http://buildingadvisor.com/wp-content/uploads/2014/05/Figure1-3-copy-1.jpg
Last but not least, make sure the wood is installed in a way that it can quickly dry, which no deep creases where moisture gets stuck. This is more a general thing to prevent moulding of wood, but it probably also discourages termites.