Mar 06, 2013 - 07:51 AM
The rate of application on almost all termiticides is 4 gallons per 10 linear feet per foot of depth. What this means is that once the chemical (which comes concentrated) is mixed with water, the finished mix is then applied at this rate.
When treating a foundation with more than 1 linear foot of depth, and without using any high pressure rodding or sub soil injection tools, in other words "pouring" the mix into the trench, I would recommend to use the highest amount of water possible so that the mix reaches as far down into the soil as possible. Using a low amount of water and a high amount of concentrate is fine for treating shallow trenches and small areas, but for areas like what you are describing, up to 5 feet deep, you need as much water as possible.
A trick that could help is to use an auger and create holes that penetrate down along the foundation as deep as you can get them. Using a piece of thick rebar steel and hammering it into the soil every foot or so can also help. Remember, you are trying to saturate the entire 5 feet of soil with mix.
With that said, I can also tell you that most pest control companies will not treat the entire 5 feet of soil. Most will only treat 1-2 feet at the most. This is done to save time, chemical cost and also because they just don't do it. I understand what the chemical label says, but if you call around and talk to several pest control companies, and really quiz them on this, you will find what I am saying is true.
Be sure to treat the outer perimeter and then also at least "spot" treat where the termites are active indoors.
My best recommendation as far as chemicals go is either Termidor or Taurus. I would not recommend Dominion for this application.
Here is the link to Termidor - http://www.epestsupply.com/product/BA...
Here is the link to Taurus - http://www.epestsupply.com/product/72...
Taurus has the exact same ingredient "fipronyl" at 9.1% as Termidor as is a little less expensive.
Hope this helps.