Your project requires chemical termite treatment around the foundation. In Hawaii, what is the minimum soil treatment depth required?
Correct Answer
A) To the bottom of the footing
Hawaii termite treatment requirements specify treatment to the bottom of the footing to create a complete chemical barrier against subterranean termites.
Why This Is the Correct Answer
Treatment to the bottom of the footing is required by Hawaii code for chemical soil termite treatment. This ensures a complete, unbroken chemical barrier around the entire foundation perimeter. If treatment stops short of the footing bottom, subterranean termites can exploit the untreated soil beneath the footing to gain access to wood structural members above.
Why the Other Options Are Wrong
Option B: 12 inches below grade
12 inches below grade is a fixed depth that may or may not reach the bottom of the footing, depending on footing depth. Hawaii's requirement is performance-based (reaching the footing bottom) rather than a fixed depth, ensuring the barrier is complete regardless of footing depth variation.
Option C: 6 inches below grade
6 inches below grade is insufficient and would leave the soil beneath deeper footings untreated, creating a gap in the chemical barrier through which termites could access the structure.
Option D: 18 inches below grade
18 inches below grade is also a fixed depth that does not account for footing depth variation. While it might be sufficient for shallow footings, it could also be excessive or inadequate depending on actual footing depth, and is not the Hawaii code standard.
Memory Technique
Think of it as 'closing the door completely' — if you treat only to a fixed depth but the footing goes deeper, you've left the door open at the bottom for termites. Hawaii requires you to close that door all the way to the footing bottom.
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