re: DIY Termite Treatment

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How often should this and trenching be done?

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I assuming you live in Louisiana, if that's the case, inspect every year, walk around your house and look for dirt tunnels that lead from the ground to where the slab and structure meet. Ants also make tunnels, you can tell them apart by scratching them, termite tunnels are hard, ants are like an at bed, it will crumble when scratched. Make sure that you don't disturb the soil where the trench is, if you dig the dirt from around the edge of yoir house, you will need to retreat that area. If you find no tunnel during inspection, you're good for 5 years here in Louisiana, they like the warm humid climate of the south, further north you can wait up to 10 years if inspections are clear. Make sure you check the inside of your house as well, anywhere plumbing comes through the concrete. If you're on a pier and beam foundation, you need to check your crawl space.

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Should I drill and treat a few feet from that?

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That's probably a little overkill but it wouldn't hurt if it gives you peace of mind. We would drill about 6 inches from the edge of the concrete so you don't chip a piece off. Inject chemical until you see it come up around thr expansion joint where the driveway and house meet.

Hope this helped, let me know if you have any more questions.