Drywood Termite Treatment: How to Protect Your Home from Costly Damage in 2026

Drywood termites don’t need soil contact to thrive, they live inside the wood they eat, making them harder to detect than their subterranean cousins. By the time you spot the telltale kick-out holes or piles of frass, they’ve often been chewing through your framing, trim, or furniture for months. Left unchecked, a drywood infestation can cost thousands in structural repairs and professional treatment. The good news? With the right approach, whether DIY spot treatment or whole-structure fumigation, you can eliminate the colony and protect your investment. This guide walks through identification, treatment options, and prevention tactics to help homeowners make informed decisions fast.

What Are Drywood Termites and How Do They Differ from Subterranean Termites?

Drywood termites (Incisitermes and Cryptotermes species) live entirely within the wood they consume. Unlike subterranean termites, they don’t require contact with soil or a moisture source, they extract water from the wood itself and from metabolic processes. This makes them common in attic framing, window sills, door jambs, and even wooden furniture.

Key differences:

• Habitat: Subterranean termites nest in soil and build mud tubes to access above-ground wood. Drywood termites nest directly inside dry wood with no ground contact.
• Colony size: Drywood colonies are smaller (a few thousand individuals) versus subterranean colonies that can number in the hundreds of thousands.
• Moisture needs: Subterranean termites need high moisture: drywood termites thrive in wood with as little as 10–12% moisture content.
• Frass (droppings): Drywood termites produce distinctive pellet-shaped frass that looks like tiny grains of sand or coffee grounds. They kick it out through small holes. Subterranean termites use their waste to build mud tubes.

Drywood termites are most common in warm, coastal climates, California, Florida, the Gulf Coast, and parts of the Southwest. If you’re in these regions, annual inspections are smart preventive maintenance.

Signs Your Home Has a Drywood Termite Infestation

Catching an infestation early limits damage and treatment cost. Here’s what to look for during routine walkthroughs:

• Kick-out holes: Small, circular exit holes (1/16 to 1/8 inch diameter) in wood surfaces where termites expel frass. They’re often found in baseboards, window frames, or exposed beams.
• Piles of frass: Hexagonal pellets accumulating below kick-out holes or inside attics and crawl spaces. The pellets are uniform in size and shape, distinct from sawdust.
• Discarded wings: Swarming reproductives (alates) shed their wings after mating flights, typically in late summer or fall. You’ll find piles near windowsills or door thresholds.
• Blistered or hollow-sounding wood: Tap suspect wood with a screwdriver handle. Infested wood sounds hollow and may crumble under pressure.
• Swarmers indoors: Winged termites emerging inside the home indicate an active colony. Drywood swarmers are tan to dark brown, with equal-length wings.

If you spot multiple signs, especially frass combined with kick-out holes, it’s time to call a licensed pest control operator for a full inspection. Many states require a certified termite report (often called a Wood Destroying Pest Inspection Report) before a home sale. Don’t wait until then.

Professional Drywood Termite Treatment Options

When infestation is widespread, or hidden inside walls and attics, professional treatment is the most reliable route. Two methods dominate the industry:

Fumigation (Tenting)

Whole-structure fumigation is the gold standard for eliminating drywood termites throughout an entire building. The process involves sealing the home under a gas-tight tarp and introducing sulfuryl fluoride (Vikane) or other fumigants that penetrate all wood members, killing termites at every life stage.

What to expect:

1. Preparation: Occupants and pets must vacate for 24–72 hours. Remove or seal all food, medicine, and plants. Landscaping near the foundation may need protection.
2. Tenting: Tarps cover the structure. Fumigant is released and held at lethal concentration for 12–24 hours.
3. Aeration: The home is ventilated and tested for safe re-entry.

Pros: Kills termites in inaccessible areas (inside walls, beneath floors). One treatment covers the entire structure. No drilling or visible damage.

Cons: High cost (typically $1,200–$2,500 for an average single-family home, depending on region and square footage). No residual protection, termites can reinfest if preventive measures aren’t taken. Requires temporary relocation.

Best for: Homes with multiple infestation sites, or when the extent of damage is unknown. Many termite extermination methods include fumigation as the most comprehensive option.

Heat Treatment

Structural heat treatment raises the interior temperature of infested areas to 120–140°F for several hours, killing termites without chemicals. Specialized equipment heats rooms or whole structures using propane heaters and fans.

What to expect:

1. Technicians seal off target areas and introduce heated air.
2. Temperature is monitored with sensors to ensure lethal heat penetrates all wood.
3. Treatment lasts 6–8 hours: no evacuation for days, but occupants typically leave during the process.

Pros: No chemical exposure. Faster re-entry (same day or next day). Effective for localized infestations.

Cons: Requires sufficient access and insulation. Can damage heat-sensitive items (electronics, vinyl, some finishes). Cost is comparable to fumigation. Limited availability in some markets.

Best for: Eco-conscious homeowners, multi-unit buildings where fumigation is impractical, or localized infestations where drilling isn’t an option.

DIY Drywood Termite Treatment Methods

If you’ve caught a small, localized infestation early, say, in a single piece of trim or a windowsill, DIY spot treatment can be effective. Be realistic: if you’re seeing evidence in multiple rooms or can’t access the infested wood, call a pro.

Spot treatment with termiticides:

• Borate-based products (e.g., Bora-Care, Timbor) penetrate wood and kill termites on contact. They also provide residual protection.
• Apply to bare wood: paint or stain blocks absorption. Drill small holes (1/8 inch) into infested wood and inject or brush on the solution.
• Best for exposed framing, attic beams, or furniture. Follow label directions for mixing and application rates.

Liquid nitrogen or CO₂ freezing:

• Handheld cryogenic tools freeze termites in place. Effective for small, accessible colonies in trim or furniture.
• Requires direct contact with infested wood. Not practical for large or hidden infestations.

Orange oil (d-limonene):

• Derived from citrus peels, orange oil dissolves termite exoskeletons. Inject into kick-out holes or apply to exposed wood.
• Effectiveness varies. Works best on small, surface-level colonies. Not a substitute for professional treatment in widespread cases.

Microwave devices:

• Specialty tools heat wood internally using microwave energy, killing termites without chemicals.
• Requires purchase or rental of equipment ($$). Time-consuming for large areas.

Safety & limitations:

• Always wear gloves, goggles, and a respirator when handling termiticides or drilling into infested wood.
• DIY treatments don’t guarantee you’ve reached the entire colony. If frass reappears within a few weeks, the infestation likely extends beyond the treated area.
• Structural damage assessment requires a professional. If you’re seeing frass in load-bearing members, get an inspection before proceeding.

Many homeowners find DIY repair tutorials helpful for learning application techniques, but termite biology is unforgiving, missed pockets mean ongoing damage.

How to Prevent Drywood Termites from Returning

Treatment kills active colonies, but drywood termites can reinfest from neighboring structures or new swarmers. Prevention is ongoing.

Seal entry points:

• Caulk cracks in exterior wood, siding, and stucco. Drywood swarmers are small and can enter through gaps as narrow as 1/32 inch.
• Install fine mesh screens (20-mesh or finer) over attic vents, crawl space vents, and weep holes.

Apply borate wood treatments:

• Treat exposed framing, attic lumber, and subfloors with borate solutions during construction or renovation. Once absorbed, borates remain effective for decades.
• Good for new construction or homes undergoing remodels. Not effective on painted or finished wood.

Replace damaged wood:

• Remove and replace heavily damaged framing, trim, or siding. Termites can reinfest compromised wood if eggs or nymphs remain.
• Use pressure-treated lumber or naturally termite-resistant species (redwood, cedar, cypress) for exterior applications.

Reduce wood-to-ground contact:

• Keep firewood, lumber piles, and mulch at least 12 inches from the foundation. Drywood termites don’t need soil, but reducing harborage helps.
• Trim tree branches and shrubs away from the roofline to limit swarmer access.

Schedule annual inspections:

• Hire a licensed pest control operator to inspect attics, crawl spaces, and exterior wood annually. Early detection = smaller bills.
• Many home improvement cost estimators provide pricing for termite inspections and preventive treatments, which typically run $75–$150 per visit.

Monitor for swarmers:

• Note the timing of swarmer flights in your area (usually late summer to fall). If you see winged termites indoors, inspect immediately.

Prevention isn’t glamorous, but it’s cheaper than fumigation. Treat your home’s wood framing like the investment it is, seal, inspect, and stay vigilant.