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hoosier inspector

Evidence of treatment?

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Recent inspection had what I can only guess is filled holes from termite treatment in the CMU foundation. I've never seen drilling in between the blocks, only in the hollow cores. Could this be anything else?

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Standard practice is drilling through the hollow void in the CMU blocks. The purpose of which is to inject termiticide under the slab, and into the block voids. Current rules call for drilling each hole a minimum of 12" apart.

If the blocks have been poured with concrete, then of course there would be no void so there is no harm in the drill locations that you see.

If the treatment was done prior to 1995, the standard was to drill one hole every 18" (which could also be an indicator of why the drill marks are in the mortor joints in your picture).

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