Lar
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assuming you mean for subterranean termites..what you can do to help would be make sure they aren't coming in from a faulty grade where the soil around the home is higher than the bottom of the veneer. Other than that, when you have it treated insist they use a product called Termidor. Stay away from the baits, way too much money for no more the results.
DrDontheTermiteGuy
The methods differ between termite types and a host of other factors. They're sneaky little critters and it often takes a deal of knowledge to avoid making a right mess of things. The general answer is baiting for subterraneans and fumigation for drywoods (http://drdons.net/termite-control-methods ) but that mightn't be right for you. Find a competent inspector (http://drdons.net/content/choose ) and get a timber pest inspection done first. Then you'll know what your dealing with and have a good idea of the best/cheapest way to proceed.
Anonymous
Call a pro to do it. Termites can do a lot of damage if not treated correctly. If you do it your self use bait stations.
http://durmebugs.tripod.com/gettingridofpests/id53.html
mountainriley
An exterminator. This isn't something you want to go cheap on. Your investment is too great.