A termite sprayer is specialized pest control equipment designed to pump liquid termiticide into soil, trenches, and structural voids around a building’s foundation. These aren’t ordinary garden sprayers. They need to deliver precise volumes (typically 4 gallons per 10 linear feet per foot of depth) at controlled pressure, with components that won’t degrade from chemical exposure. The equipment ranges from small handheld foamers to truck-mounted rigs with 100-gallon tanks, and choosing the right type depends on whether you’re treating soil around a foundation, injecting beneath a concrete slab, or reaching hidden galleries inside walls.
Types of Termite Sprayers
Termite treatment equipment falls into three broad categories, each built for a different part of the job.
Low-pressure tank sprayers are the workhorses of perimeter treatment. These range from 25-gallon ATV-mounted units (like the Chapin 25-gallon 12V spot sprayer) up to larger truck-mounted rigs with electric or gas-powered pumps. They deliver a steady, measured flow along foundations and footings using fan or stream nozzle tips. The goal is even saturation of the soil without blasting termiticide everywhere, so operating pressure stays below 25 PSI for most applications.
Soil injection rods attach to these same sprayer rigs but push termiticide deeper underground. When the treatment needs to reach 30 inches below grade (the standard minimum depth for reaching a footing), a surface pour won’t cut it. Injection rods are hollow metal tubes with a pointed tip that you drive into the soil, then pump liquid through at a calibrated rate. For slab treatments, technicians drill vertical holes along cracks and construction joints at 12-inch intervals, no more than 6 inches from the foundation, and inject termiticide beneath the concrete.
Foaming sprayers handle the places liquid can’t reach: wall voids, plumbing penetrations, spaces between structural wood members, and termite galleries carved into damaged lumber. Units like the B&G VersaFoamer expand termiticide into a dry foam at a ratio of about 30 to 1. That means a small amount of liquid formula becomes a large volume of foam that fills cavities and contacts insects hidden deep inside. One pressurized canister of a common foam product treats roughly 1,000 cubic inches of void space, dispensing at about 0.9 fluid ounces of liquid per four seconds.
Pressure and Flow Rate Standards
Termite sprayers operate at much lower pressures than you might expect. For horizontal soil barriers, labels typically call for nozzle pressure under 25 PSI using a coarse raindrop-style nozzle. Higher pressure creates fine mist that drifts, increases inhalation risk, and doesn’t saturate soil effectively. The standard target flow rate for most termite application rigs is 2 gallons per minute, according to Purdue University’s pesticide calibration guidelines.
Calibration matters because label rates are legally binding. The standard application rate for a vertical barrier along a foundation is 4 gallons of mixed termiticide per 10 linear feet for every foot of depth. A horizontal barrier under a slab requires 1 gallon per 10 square feet. If your sprayer is putting out more or less than 2 gallons per minute, you adjust pump pressure until each attachment hits that mark. Professionals record the operational pressure for every tool on the rig separately, since different hose lengths and nozzle types create different resistance.
Chemical-Resistant Components
Standard sprayer seals and gaskets will break down when exposed to termiticide concentrates. Most professional termite sprayers use Viton seals, a synthetic rubber with excellent resistance to the petroleum-based solvents, chlorinated hydrocarbons, and emulsifiable concentrates found in common termiticide formulations. Teflon components serve a similar purpose in valves and fittings. Chemical-resistant hoses are equally important: a standard garden hose will soften, crack, and fail after repeated exposure to termiticide.
If you’re buying a sprayer for termite work, check that the pump, seals, hoses, and O-rings are all rated for pesticide use. A cheaper agricultural sprayer might handle the pressure and volume just fine but degrade internally within a few uses, contaminating future applications and eventually leaking.
Foam Application for Hidden Infestations
Foaming is the go-to method for above-ground termite activity inside a structure. Liquid termiticide poured along a foundation can’t reach a colony that’s already inside your walls, eating through framing lumber three feet above the slab. Foam can.
Technicians drill small injection holes and insert a foamer tip into galleries in damaged wood, spaces between wooden structural members, junctions between sill plates and foundations, and voids behind drywall. The foam expands to fill irregular spaces that liquid would simply run through. It works in crawlspaces, basements, attics, and exterior structures like decks and fence posts. Carton nests (the muddy, structured nests subterranean termites sometimes build inside wall cavities or trees) are another common foam target.
After pulling the trigger, you hold the application tip firmly against the injection point for a full 5 seconds after releasing. This lets product still in the hose fully expand and enter the void rather than oozing back out the hole.
Safety Gear for Termiticide Spraying
The EPA sets specific protective equipment requirements for anyone mixing, loading, or applying termiticides. At minimum, you need long-sleeved shirt and long pants, socks, closed shoes, and chemical-resistant gloves. Many termiticide labels go further, requiring coveralls worn over clothing, chemical-resistant footwear, and protective eyewear (goggles, a face shield, or safety glasses with brow and temple protection).
Respiratory protection adds another layer. A dust/mist filtering respirator or an organic-vapor cartridge respirator with a pesticide prefilter is required whenever you’re working in a non-ventilated space, which includes crawlspaces, enclosed basements, and any area under a structure. Sub-slab injection and soil rodding also call for protective eyewear even in open-air settings, since pressurized liquid can splash back through drill holes.
Cleaning and Maintaining Your Equipment
Termiticide residue left inside a sprayer corrodes seals, clogs nozzles, and can cross-contaminate if the equipment is ever used for another purpose. A proper post-use cleaning follows a consistent sequence: pre-rinse, dispose of rinsate, deep clean, inspect, and store.
Start by circulating clean water through the entire system, including agitation lines and return lines, then apply that rinse water to a labeled treatment site. Don’t dump it on the ground. For the deep clean, fill the system with a cleaning solution. Emulsifiable concentrates (the formulation type used in many liquid termiticides) leave an oily film that responds well to a fuel oil or kerosene flush followed by a detergent rinse. After flushing, remove nozzles and screens and soak them in cleaning detergent for 24 hours before rinsing and reinstalling.
Inspect all hoses, fittings, and pump components after cleaning. Even on a “clean” sprayer, wear gloves and eye protection during inspection since chemical residue can persist on internal surfaces. Replace cracked hoses, worn seals, or corroded fittings before the next use. If you’re storing the sprayer over winter, drain all water from the pump and lines to prevent freeze damage, and leave valves open so trapped moisture can evaporate.
Choosing the Right Sprayer for the Job
For a full perimeter treatment around a home’s foundation, you need a tank sprayer with enough capacity to mix and apply hundreds of gallons in a single job. A typical 1,500-square-foot house with a 150-linear-foot perimeter and footings 3 feet deep requires roughly 180 gallons of diluted termiticide just for the exterior vertical barrier. A 25-gallon ATV sprayer means constant refilling. Professionals use 100-gallon or larger rigs for this reason.
For localized spot treatments, a smaller backpack or handheld sprayer paired with a foamer covers most situations. If you’re treating a known infestation in a specific wall or a small section of damaged framing, a foaming unit alone may be sufficient. Just keep in mind that spot treatments don’t create the continuous chemical barrier around a foundation that prevents future colonies from entering, so they’re a targeted fix rather than a whole-house solution.