Pre-Construction Treatment Calculator

Pre-construction termiticide treatment is calculated in two separate zones, matching how EPA-labeled liquid termiticides like Termidor SC, Premise 75, and Altriset are actually applied: a horizontal barrier under the whole slab (1 gallon of diluted solution per 10 square feet of foundation) and, optionally, a vertical trench barrier around the perimeter (4 gallons per 10 linear feet, per foot of trench depth) — the standard label rate this calculator is built around. Trench depth is derived from slab thickness plus a fixed 6 inches below it, since the barrier needs to extend past the slab edge into undisturbed soil. Soil type adjusts total volume through a retention multiplier: sandy soil drains faster and holds less product, so it gets 25% more solution than the baseline loam rate, while clay retains moisture and chemical better, needing 15% less.

Once total diluted gallons are known, the calculator converts to fluid ounces of concentrate using each product's label mixing rate (Termidor at 0.8 fl oz/gal, Premise at 1.0, Altriset at 0.5) and prices it against each product's approximate per-ounce cost — Altriset is the most expensive per ounce but used at the lowest concentration. Labor assumes pre-construction access is faster than a retrofit (roughly 1 hour per 500 sqft plus 1 hour per 100 linear feet of trench), and a flat $150 covers pump and hose equipment. This estimates material volume and rough cost for planning — actual application rates must always follow the specific product's EPA label and local building code requirements, which can vary by jurisdiction and termite pressure.