If you are doing a
termite barrier treatment (6 inch x 6 inch trench against the structure) with a termiticide such as
Taurus SC around the entire pertimeter of the home, you will not need to drill those exterior walls. The trench will provide your protection. We highly suggest this method as opposed to just "spot treating" areas of the foundation. If you are not doing a
termite barrier trench treatment, you will need treat those two exterior walls as you would that interior wall. Drill 1/2 inch holes 2-3 inches off the foundation wall every 10-12 inches along the entire length of the wall. Pour 4 gallons of mixed solution in the holes for every 10 linear feet along the exterior wall (3.2 ounces/4 gallons of water) Each hole will hold 1/2 gallon of solution.