Primary entity: Termite prevention · Parent: Structural pest prevention
Published · Updated
Termites need four things to attack your home: moisture, wood-to-soil contact, an unmonitored path in, and time. Take away any one and the risk collapses. Take away all four and the house is functionally termite-proof.
Each pillar shuts down one of the biological requirements. All four in place = effectively zero risk.
Pillar 1
Removes the water termites need
Grade soil to slope away from the foundation; direct downspouts at least 4 feet away; fix any plumbing leak within a week; ventilate crawlspaces to keep RH below 65%.
A single unfixed AC condensate line into the crawlspace is enough to sustain an active subterranean termite colony indefinitely.
Pillar 2
Removes the direct path from colony to structure
Maintain at least 6 inches between exterior wood siding/trim and finished soil; use concrete or metal for anything embedded in the ground.
Deck posts sunk directly into soil are a top-three termite entry point in single-family homes.
Pillar 3
Removes concealment and staging
Keep mulch under 3 inches deep; hold mulch and dense plantings at least 12 inches from the foundation; avoid stacking firewood against the house.
Firewood stacked against a foundation is a colony transportation vector — treat wood as if it already contains termites.
Pillar 4
Removes the 'time' variable
Professional inspection every 12 months for high-risk regions, every 24 months elsewhere. Personal quarterly foundation walk-around to spot mud tubes.
A colony detected in year one is a $400 treatment; a colony detected in year four is often $3,000+ plus repair.
Score your home honestly on each factor before assuming you are low-risk.
Region and soil type
criticalFormosan termites in the Gulf Coast and drywood termites in coastal California triple risk regardless of other factors.
What to do: In high-pressure regions, annual professional inspection is non-negotiable regardless of other controls.
Slab-on-grade vs raised foundation
highSlab foundations concentrate termite entry at plumbing penetrations; raised foundations spread risk across many piers.
What to do: Have all slab plumbing penetrations sealed and inspected annually.
Age of home (30+ years)
highOlder homes have accumulated moisture events, soil settling, and cracks that create new entry paths.
What to do: Comprehensive termite inspection with moisture meter at year 30 and every 3 years after.
Landscape mulch against foundation
highMulch retains moisture and provides pathway. Cypress and cedar mulch resist termites; hardwood mulch attracts them.
What to do: Switch to gravel or rubber mulch within 12 inches of foundation.
Wooden fencing attached to house
moderateFence connects to soil at multiple points and to house via bracket — creates a bridge.
What to do: Use metal brackets and pressure-treated wood; inspect fence-to-house connection annually.
Prior termite history at address or on street
moderateColonies persist in soil for decades — a prior treatment does not eliminate regional pressure.
What to do: Any home within 300 feet of a documented termite treatment should carry active monitoring.
Walk the full exterior looking at the top 12 inches of foundation for mud tubes.
Mud tubes are the most reliable early sign — pencil-thick soil smears bridging concrete to wood.
Tap accessible sill plates and trim with a screwdriver handle listening for hollow sounds.
Hollow-sounding wood is a late sign but confirms an active colony.
Check for peeling paint or blistering on siding at ground level.
Termites eat wood from inside, leaving a paper-thin painted shell that lifts and blisters.
Look for swarmer wings on windowsills after warm spring rain.
Discarded wings are the earliest possible interior signal of a mature colony.
Inspect crawlspace beams and joists with a flashlight for surface mud or galleries.
Subterranean colonies expand upward — crawlspace inspection catches them years before visible interior damage.
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Yes — bonds combine bait/barrier treatment with annual inspection and repair guarantees. For homes in high-pressure regions the annual cost is less than a single reactive treatment.
Yes for moisture control, wood-soil separation, and landscape — no for the annual inspection. Termite inspection requires moisture meters, thermal imaging, and species-specific training.
Modern non-repellent termiticides last 8–12 years; bait systems require annual station monitoring but last as long as the contract is maintained. See termite treatment cost breakdown for method-by-method economics.
Pressure-treated lumber and steel framing resist attack but every home contains untreated wood inside — cabinets, subfloor decking, trim. Prevention still applies.
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