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Mark from Bryson City, Nc writes

Treating around perforated tiled and white rocked perimeter.

As we were building our house about 3 years ago, the inspector suggested that we add a second perforated tile (there was already a French Drain 7-8ft deeper at the walk-out basement floor height) right next to the foundation just below the surface (4-12") and fill the whole area with white rock. I really don't want to dig all of this up to apply the Termidor. Can I just trench down into the white rock a few inches and apply the Termidor next to the foundation as usual or do I need to get all the way down to the dirt? If the Termidor worked it way into the perf tile, would it still be effective? The construction is 12" filled block on a mono-slab and there is about 8" of block exposed before any wood, so I think I would see any tunnels if termites were in the area.


Termidor SC is made to bind to soil molecules. When Termidor SC is put in the ground as a soil treatment, it will last for at least 10 years. Although, it is a little different when it is applied to porous surfaces such as rocks. Porous surfaces will actually absorbe the active ingredient meaning that it would only last a few months. Therefore, we would recommend that you remove the rocks and be sure to treat the soil below according to the label instructions.

Answer last updated on: 09/22/2014

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