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Terry writes

I have a concrete slab, approx. 12,000 sq ft, with termites under it, coming into building through cracks.

Will we have to drill holes every 10-12", or basically every square foot, to treat, or will drilling around the perimeter suffice

Answer:

If termites are coming up in the middle of a slab through a crack, then you should do two things.  One, you should always treat the exterior of a structure if you want to prevent future infestation by doing an exterior treatment as outlined in our How To Do A Termite Treatment article.  If there are termites in the structure or under the slab then the building probably has not been treated in a while.  Secondly, if you know where the termites are you should always treat them directly in addition to treating the exterior.  In your situation where they are coming through a crack, you should drill alternating holes using a hammer drill 2 to 3 inches off of the crack on either side of the crack every 10 to 12 inches apart for the length of the crack, and inject a termiticide through those holes at a rate of 4 gallons per 10 lineal feet.

Answer last updated on: 03/22/2011

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