Evaluating Termite Treatment Quality: Barriers and Bait Systems

A homeowner (Jo) questioned a termite treatment where holes were drilled 18" apart without trenching. The company claimed chemicals spread underground to form a barrier.

Standard Termite Treatment Methods

Liquid Barrier Treatment (Traditional)

• Trenching: 6"x6" trench along foundation; treat soil
• Drilling: 12-18" apart through slabs/porches
• Roding: Inject to footer depth at intervals
• Goal: Continuous chemical curtain

Baiting Systems (Modern Alternative)

• Stations: Perimeter every 10-15'
• Monitoring: Quarterly inspections
• Active ingredient: IGR (novaluron, diflubenzuron) or slow-acting toxicant
• Colony elimination: Workers share bait → queen dies

Evaluating This Treatment

Concerns with 18"-Only Drilling

• Gaps in barrier: 18" spacing may leave untreated zones
• No trenching: Foundation wall base untreated
• Soil type matters: Clay = poor lateral movement; sand = better
• Product matters: Non-repellents (Termidor) move better than repellents

Termidor (Fipronil) — The Gold Standard

• Non-repellent: Termites don't detect; forage through treated zone
• Transfer effect: Contaminated termites share with colony
• Lateral movement: Better soil dispersion than older chemistries
• Label requirement: Trenching + drilling per label directions

Bait Systems: Advance vs. Sentricon vs. Trelona

What This Homeowner Should Do

1. Request treatment report: Product used, concentration, volume, diagram
2. Verify Termidor label compliance: Trenching required per label
3. Demand trenching or written explanation of why omitted
4. Consider bait system ADDITION: Dual protection (barrier + bait)
5. Get second opinion: Different company inspection
6. Check warranty: Retreatment clause; damage repair coverage

Red Flags in Original Treatment

• No trenching (label violation for most products)
• 18" drilling only (insufficient for repellent termiticides)
• Vague "chemicals spread" explanation (unprofessional)
• No bait system discussed (modern standard of care)

Cost Considerations

• Retreatment: Often covered under warranty if active termites found
• Bait add-on: $800-1,500 typically
• Annual renewal: $250-500 for monitoring
• Damage repair: Rarely included; separate bond/insurance

The original answer correctly identified Termidor + Advance baiting as best-in-class. The homeowner's skepticism about "chemicals spreading" was well-founded — proper barrier treatment requires both trenching AND drilling per label.

System	Active	Inspection	Cost Range
Advance	Diflubenzuron	Quarterly	$1,200-1,800 install + $250-400/yr
Sentricon	Noviflumuron	Annual	$1,500-2,500 install + $300-500/yr
Trelona	Noviflumuron	Quarterly	$1,000-1,500 install + $200-350/yr