Anti-Termite Treatment in Construction India — IS 6313 Complete Guide for Engineers and Contractors (2026)

Subterranean termites are the single most destructive pest threatening Indian buildings. They operate silently — tunnelling through soil, entering structures through cracks as narrow as 0.5 mm, and consuming wood, paper, textiles, and even cable insulation from the inside out. By the time visible signs appear — hollow-sounding door frames, mud tubes on walls, winged swarmers after the first monsoon rains — the damage is already extensive.

India's tropical and subtropical climate creates ideal conditions for termite activity across most of the country. The Indian construction industry estimates termite damage costs of approximately Rs 35,000 crore annually, affecting residential buildings, commercial offices, industrial facilities, and heritage structures alike. Yet anti-termite treatment remains one of the most poorly understood and inconsistently executed aspects of Indian construction practice.

This guide covers the IS code framework governing anti-termite treatment, the approved chemicals and their specifications, step-by-step procedures for both pre-construction and post-construction treatment, foundation-type-specific requirements, cost benchmarks, warranty obligations, and RERA implications — everything an Indian engineer, architect, contractor, or developer needs to execute or supervise anti-termite treatment correctly.

IS 6313 — the governing standard

Anti-termite treatment in Indian construction is governed by IS 6313, published by the Bureau of Indian Standards (BIS). The standard is divided into three parts:

Revision history of Part 2

IS 6313 Part 2 is the most frequently updated part because it tracks changes in approved chemicals:

• 1971 — Original publication (referenced Aldrin, Chlordane, Heptachlor)
• 1981 — First revision (same chemicals, updated procedures)
• 2001 — Second revision (Chlorpyrifos 20 EC and Lindane 20 EC at 1.0% concentration)
• 2013 — Third revision (dropped Lindane after it was listed as a Persistent Organic Pollutant under the Stockholm Convention in 2009; added Imidacloprid and Bifenthrin)
• 2022 — Fourth revision (current edition; references IS 8944 for Chlorpyrifos, IS 16131 for Imidacloprid, IS 15936 for Bifenthrin)

Why IS 6313 matters for every project

IS 6313 compliance is not optional for most formal construction in India:

• CPWD (Central Public Works Department) mandates IS 6313 compliance for all government buildings
• State PWDs reference IS 6313 in their standard specifications (though some are dangerously outdated — more on this below)
• NBC/NBCS 2026 references IS 6313 for termite protection in building construction
• RERA-registered projects are expected to follow BIS standards, and anti-termite treatment falls under the 5-year defect liability period
• Housing finance institutions and insurance companies may require IS 6313 compliance certificates

Approved chemicals and their specifications

IS 6313 Part 2:2022 approves three chemicals for pre-construction soil treatment. Each chemical has a separate BIS specification standard:

Chlorpyrifos — still legal in India

There is widespread confusion about whether chlorpyrifos is banned in India. Here is the factual position as of June 2026:

• Chlorpyrifos is NOT fully banned in India. It is restricted only for three agricultural crops — Ber, Citrus, and Tobacco — per Government of India notification S.O. 4294(E) dated 3 October 2023.
• It remains fully legal for anti-termite treatment in construction.
• At the Stockholm Convention COP-12 (Geneva, April-May 2025), chlorpyrifos was listed under Annex A (elimination) but India secured a five-year specific exemption explicitly covering "wood preservation against borers and termites in construction."
• The exemption runs through approximately 2031, after which India will need to seek renewal or transition to alternatives.
• The legacy organochlorines — Aldrin, Chlordane, and Heptachlor — are completely banned in India for manufacture, import, and use.

Practical implication: Chlorpyrifos 20 EC remains the most widely used and cheapest anti-termite chemical in India. However, its long-term regulatory future is uncertain. New projects with 10+ year timelines should consider specifying Imidacloprid or Bifenthrin as the primary chemical to avoid re-treatment complications if chlorpyrifos is eventually phased out.

Imidacloprid — the modern alternative

Imidacloprid is a neonicotinoid insecticide with two critical advantages over chlorpyrifos for termite treatment:

1. Non-repellent: Termites cannot detect Imidacloprid in treated soil, so they pass through the barrier and pick up a lethal dose. Chlorpyrifos is a repellent — termites avoid treated soil but may find untreated gaps.
2. Transfer effect: Termites exposed to Imidacloprid carry it back to the colony, spreading it through grooming and trophallaxis (food sharing). This colony elimination effect provides longer-lasting protection.

The leading Imidacloprid product in India is Premise (Imidacloprid 30.5% SC) by Envu (formerly Bayer Environmental Science). In March 2025, Envu launched India's first certified 10-year termite warranty for pre-construction treatment using Premise, requiring IS 6313 compliance and application by certified EPEA (Envu Pest Expert Alliance) members.

Bifenthrin — the pyrethroid option

Bifenthrin 2.5 EC is a synthetic pyrethroid that works as both a contact and stomach poison. It binds strongly to soil particles, giving it good residual activity. It is generally positioned between Chlorpyrifos (cheapest) and Imidacloprid (most effective) in the Indian market.

Chemical comparison summary

Pre-construction treatment procedure (IS 6313 Part 2)

Pre-construction chemical treatment creates a continuous chemical barrier in the soil beneath and around the building foundation. The treatment must be carried out before concrete is poured or flooring is laid — retro-fitting a soil barrier after construction is far less effective.

Step-by-step procedure

Step 1: Site preparation

• Remove all tree stumps, roots, and cellulosic debris (wood, paper, cardboard) from the site before treatment
• Level and compact the earth surface where treatment is to be applied
• Ensure the soil is neither waterlogged nor bone-dry — slight moisture aids chemical absorption

Step 2: Treatment of excavation bottom and sides (masonry foundations)

For masonry foundations (stone, brick, or block foundations):

• Treat the bottom surface of the excavation at 5 litres/sq.m of chemical emulsion
• Treat the sides of the excavation up to a height of 300 mm at 5 litres/sq.m
• Apply the emulsion uniformly using a low-pressure spray (garden sprayer or hand pump)

Step 3: Treatment of backfill surfaces (masonry foundations)

When refilling the excavation around the foundation:

• Treat the backfill in contact with foundation vertical surfaces at 7.5 litres/sq.m on each side
• Apply in stages as the backfill is placed — not all at once on top

Step 4: Treatment around RCC foundations

For RCC (Reinforced Cement Concrete) foundations — isolated footings, combined footings, or raft foundations:

• Treatment starts at 500 mm below ground level (not from the excavation bottom)
• The rationale: dense 1:2:4 concrete is too dense for termite penetration, so the portion of the foundation below 500 mm depth does not require chemical protection
• Treat the vertical surfaces at 7.5 litres/sq.m from 500 mm below ground level upward

Step 5: Treatment of plinth filling

The plinth fill area is the horizontal surface inside the foundation walls:

• After the plinth is filled and consolidated (compacted), treat the top surface at 5 litres/sq.m
• This treatment must be done before the sand bed, sub-grade, or flooring is laid
• Ensure the chemical emulsion soaks into the compacted earth — do not allow ponding

Step 6: Treatment at wall-floor junctions

• Treat a band of at least 300 mm width along all internal wall-floor junctions at 5 litres/sq.m
• These junctions are critical because micro-cracks between walls and floors are the most common termite entry points

Step 7: Treatment around pipes and conduits

• Any pipe, conduit, or cable duct that passes through the floor or foundation creates a potential termite entry point
• Treat the soil around these penetrations thoroughly — typically the annular space plus a 150 mm radius

Step 8: Treatment at expansion joints

• Expansion joints in masonry and concrete floors are termite highways
• Treat the full length and depth of each expansion joint with chemical emulsion

Dosage rate summary table

Emulsion preparation

Chemical emulsions are prepared on site by diluting the concentrate with water:

For Chlorpyrifos 20 EC at 1.0% concentration:

• Mix 50 ml of Chlorpyrifos 20 EC per litre of water
• This gives 1.0% active ingredient concentration (20% × 50/1000 = 1.0%)
• Prepare only the quantity needed for the day's work — emulsion should not be stored overnight

For Imidacloprid and Bifenthrin:

• Follow the manufacturer's recommended dilution rates as specified on the product label
• Imidacloprid 30.5 SC is typically diluted to 0.05-0.075% active ingredient concentration
• Bifenthrin 2.5 EC is typically diluted to 0.05-0.1% active ingredient concentration

Treatment around pile foundations

Pile foundations present a unique challenge because the soil around each pile cannot be easily treated during driving or boring. The recommended approach:

• Treat the pile cap surfaces using the RCC foundation method (from 500 mm below GL)
• Treat the ground beams connecting pile caps at their vertical surfaces
• Treat the plinth fill over the pile cap/ground beam system at 5 litres/sq.m
• For bored cast-in-situ piles, treat the soil around the pile head after casting

Post-construction treatment (IS 6313 Part 3)

Post-construction treatment is remedial — applied to existing buildings that show signs of termite activity or as a preventive measure in buildings that were not treated during construction. It is inherently less effective than pre-construction treatment because the soil barrier cannot be made continuous under a completed building.

External perimeter treatment

The primary method for post-construction treatment involves creating a chemical barrier along the building's external walls:

1. Excavate a shallow channel (150-200 mm wide, 300 mm deep) along the external foundation wall
2. Insert 12 mm diameter mild steel (MS) rods at 150 mm intervals into the channel soil — this helps the chemical emulsion penetrate deeper and more uniformly
3. Apply chemical emulsion at 7.5 litres/sq.m on the exposed vertical surface
4. Backfill the channel with treated soil

Floor drilling method

For treating soil below existing floors (where termite tubes or damage are found):

1. Drill 12 mm diameter holes through the floor at 300 mm intervals along the affected area
2. Drill deep enough to reach the soil below the flooring
3. Inject chemical emulsion at 2.25 litres per linear metre through the holes
4. Maximum 1 litre per hole — overfilling can cause emulsion to seep through cracks and damage finishes
5. Seal the holes with cement mortar after treatment

Treatment at wall-floor junctions (existing buildings)

1. Drill 12 mm holes at 300 mm intervals along the wall-floor junction on the inside
2. Angle the drill slightly toward the wall to reach the soil-wall interface
3. Inject emulsion at the standard rate
4. Seal holes after treatment

Physical barriers and non-chemical methods

IS 6313 Part 1 covers non-chemical approaches to termite management. While chemical soil treatment remains the primary method in India, physical barriers are gaining adoption in high-value and environmentally sensitive projects.

Termite shields

A termite shield is a continuous sheet of non-corrodible metal (typically galvanised iron or stainless steel) installed between the foundation and the superstructure. The shield does not kill termites — it forces them to build visible mud tubes around the shield edge, making their presence detectable during routine inspection.

Key specifications:

• Material: 0.9 mm galvanised iron or 0.5 mm stainless steel
• Projection: minimum 50 mm beyond both faces of the wall
• Bend: 45-degree downward bend at the projecting edges
• Joints: soldered or sealed — any gap defeats the purpose

Stainless steel mesh barriers (Termi-Mesh)

Stainless steel mesh barriers use finely woven mesh (aperture size smaller than the head width of a termite worker — typically 0.66 mm × 0.45 mm) to physically prevent termite passage. The mesh is laid under slabs, around pipe penetrations, and at construction joints.

Advantages:

• No chemicals — suitable for organic/green building certifications
• No degradation — lasts the life of the building
• No re-treatment needed

Limitations:

• Higher initial cost (Rs 80-150/sq.ft vs Rs 3-8/sq.ft for chemical treatment)
• Requires trained installation — a single tear or improperly sealed overlap negates the barrier
• Limited availability of certified installers in India

Particle barriers

Crushed granite or basalt particles graded to a specific size range (1.7-2.4 mm) can function as a physical termite barrier. Termites cannot move particles larger than their body size and cannot tunnel through the compacted layer. This method is used in Australia and is referenced in some international building codes but has very limited adoption in India.

Baiting systems

Termite baiting systems use cellulose-based bait stations placed in the soil around a building. The bait contains a slow-acting insect growth regulator (IGR) or chitin synthesis inhibitor (typically hexaflumuron or diflubenzuron) that disrupts the termite moulting process, gradually eliminating the colony.

How baiting works:

1. Monitoring stations with untreated wood are placed at 3-4 metre intervals around the building perimeter
2. Stations are inspected monthly — when termite activity is detected, the monitoring wood is replaced with toxic bait
3. Termites feed on the bait and share it with the colony through trophallaxis
4. Colony elimination typically takes 3-12 months depending on colony size

Leading baiting systems in India:

• Sentricon (Corteva) — hexaflumuron-based; originally developed by Dow AgroSciences
• Exterra — uses Requiem (chlorfluazuron) as the active bait ingredient
• Nemesis — diflubenzuron-based system

Limitations in India:

• Requires ongoing monitoring and professional servicing (annual contracts of Rs 15,000-30,000 for a residential building)
• Slower colony elimination compared to soil treatment
• Not a substitute for pre-construction soil treatment in new buildings — best used as a supplementary measure or for existing buildings where drilling is impractical
• IS 6313 does not currently cover baiting systems in detail

Treatment by building type

Residential buildings (individual houses and low-rise apartments)

• Pre-construction treatment is mandatory for all RERA-registered residential projects
• Standard IS 6313 Part 2 procedure applies
• Pay special attention to: external toilets, kitchen waste pipe penetrations, garden/plinth interface, steps, and verandah foundations
• Warranty: minimum 5 years; 10 years available with Imidacloprid (Premise) through Envu EPEA network

High-rise buildings (G+5 and above)

• RCC raft foundations and pile foundations are common — follow the RCC-specific treatment procedure
• The basement retaining wall and waterproofing membrane interface requires careful treatment — the membrane can trap moisture and create ideal conditions for termites
• Lift pits, sump pits, and service trenches are high-risk areas
• Treatment of plinth fill above raft is critical — this is the primary horizontal barrier

Commercial and industrial buildings

• Larger floor areas mean higher chemical quantities — procurement and mixing must be planned carefully
• Warehouse and factory buildings with direct-to-ground floors need complete sub-floor treatment
• Server rooms, record storage rooms, and cable trenches need extra attention
• Many commercial projects specify Imidacloprid over Chlorpyrifos due to lower odour and better corporate HSE compliance

CPWD and PWD specifications

CPWD specification

The Central Public Works Department (CPWD) is India's largest construction agency, and its specifications serve as the benchmark for government construction nationwide:

• CPWD specifications mandate IS 6313 compliance for all buildings
• CPWD updated its specifications in 2009 to delete Aldrin and other banned chemicals
• Approved chemicals match IS 6313 Part 2: Chlorpyrifos, Imidacloprid, and Bifenthrin
• CPWD requires the anti-termite treatment contractor to provide a 10-year warranty in writing
• The warranty must be backed by a separate guarantee from the specialised pest control agency

State PWD specifications — a compliance danger zone

A critical finding from our research: several state PWD specifications are dangerously outdated, still referencing chemicals that have been banned for decades.

UP PWD (Uttar Pradesh Public Works Department):

• The published specification still references Aldrin, Heptachlor, and Chlordane — all three banned since 1996
• The specification references IS 6313 Part II 1981 edition — four revisions behind the current 2022 edition
• Despite being uploaded on the official UP PWD website circa 2017, no deprecation notice or update has been issued

BHEL specification:

• Lists Chlorpyrifos (correct), but also Heptachlor and Chlordane (both banned)
• However, BHEL's specification does include a strong 10-year service guarantee requirement matching CPWD norms

What this means for contractors:

• Do NOT blindly follow state PWD specifications without cross-checking against current IS 6313:2022
• Use only the three chemicals approved in IS 6313 Part 2:2022 — Chlorpyrifos, Imidacloprid, or Bifenthrin
• If a tender references banned chemicals, flag it to the client/engineer — using banned chemicals is a criminal offence under the Insecticides Act, 1968

Cost of anti-termite treatment in India (2026)

Anti-termite treatment cost varies by chemical type, city, building type, and contractor. The following are representative market rates for 2026:

Pre-construction treatment cost per sq.ft.

Post-construction treatment cost per sq.ft.

Post-construction treatment is typically 2-3x more expensive than pre-construction because of the drilling, injection, and repair work involved:

Typical project cost examples

Note: These costs cover chemical and labour for soil treatment only. Physical barriers (termite shields, mesh barriers) are additional. Baiting system contracts are priced annually, not per sq.ft.

Warranty and RERA implications

Standard warranty periods

RERA Section 14(3) — defect liability

Under the Real Estate (Regulation and Development) Act, 2016, Section 14(3) imposes a 5-year defect liability period on the promoter from the date of possession:

"In case any structural defect or any other defect in workmanship, quality or provision of services or any other obligations of the promoter as per the agreement for sale... is brought to the notice of the promoter within a period of five years... it shall be the duty of the promoter to rectify such defects without further charge."

How this applies to anti-termite treatment:

• Termite damage to structural wood (door frames, window frames, roof trusses) caused by absent or ineffective anti-termite treatment is a defect in workmanship under RERA
• Homebuyers can file complaints with the state RERA authority if termite damage occurs within 5 years of possession
• The promoter must bear the cost of treatment and repair — they cannot pass it to the buyer
• Multiple RERA orders have held promoters liable for termite damage as a construction defect

Practical implication for developers:

• Always obtain a warranty certificate from the anti-termite treatment contractor
• The warranty period should be at least 5 years to match the RERA defect liability period
• Retain treatment records (chemical used, dosage, date, area treated, applicator details) as evidence of compliance
• Consider Imidacloprid with 10-year warranty for premium projects to provide a buffer beyond RERA's 5-year period

Wood preservative treatment (IS 4101 and IS 6313 Part 1)

Soil chemical barriers prevent termites from entering the building from below, but they do not protect timber that may be attacked by dry-wood termites or timber borers that enter through above-ground routes.

IS 4101 — code of practice for wood preservation

IS 4101 specifies preservative treatment of timber for use in buildings:

• CCA (Chromated Copper Arsenate) — the most widely used wood preservative in India, applied through pressure impregnation
• CCB (Copper Chrome Boron) — an alternative to CCA with lower toxicity
• Creosote — used for heavy timber and railway sleepers; strong odour limits indoor use

Surface treatment of timber

For timber components that cannot be pressure-treated (door frames, window frames installed on site):

• Apply two coats of preservative oil (CCA, CCB, or proprietary formulations) on all surfaces, especially cut ends and joinery
• Ensure the preservative penetrates at least 5-10 mm into the wood surface
• Allow adequate drying time between coats
• Treatment should be done before painting or polishing

Alternative to timber

The most reliable anti-termite strategy for structural timber is to eliminate it:

• Use UPVC or aluminium door and window frames instead of wood
• Use steel sections for roof trusses and structural members
• Use WPC (Wood Polymer Composite) or fibre cement boards for non-structural applications
• Where wood is used for aesthetic reasons (e.g., panelling, furniture), use termite-resistant species like teak, sal, or rosewood, and ensure preservative treatment

Common treatment failures and how to prevent them

Top 10 reasons anti-termite treatment fails

1. Incomplete coverage — Gaps in the soil barrier, especially at pipe penetrations, expansion joints, and where the plinth wall meets the floor. Even a 5 mm untreated gap is sufficient for termite entry.

2. Wrong concentration — Diluting the chemical too much to save cost. Chlorpyrifos at 0.5% instead of the IS-specified 1.0% has roughly half the effective life.

3. Insufficient dosage — Applying 2-3 litres/sq.m instead of the IS-specified 5 litres/sq.m. Inadequate saturation means the chemical barrier is too thin to be effective.

4. Treatment on wet soil — Applying chemical emulsion on waterlogged soil or during rain. The water dilutes the chemical and carries it away from the intended treatment zone.

5. Premature construction — Pouring concrete or laying flooring before the chemical emulsion has been absorbed by the soil. Allow at least 24 hours for absorption before placing any material on treated soil.

6. Backfill without treatment — Forgetting to treat the backfill soil around foundations. The backfill is often loose soil — perfect for termite tunnelling.

7. Untreated external grade — Not treating the soil at the building-to-garden interface. Termites in garden soil can enter through cracks in the plinth wall.

8. Post-construction disturbance — Digging trenches for drainage, plumbing, or electrical cables after anti-termite treatment, breaking the chemical barrier without re-treatment.

9. Chemical degradation — Using expired or improperly stored chemical concentrates. Emulsifiable concentrates have a shelf life of 2-3 years and must be stored away from extreme heat.

10. Unqualified applicators — Using unskilled labour instead of trained pest control technicians. Anti-termite treatment is not a labourer's task — it requires understanding of termite behaviour, chemical handling, and safety protocols.

Prevention checklist

• Verify the chemical is IS-certified and within its shelf life
• Check the applicator's training credentials and past project references
• Supervise mixing to verify concentration matches IS specifications
• Ensure treatment of ALL areas specified in IS 6313 — not just the obvious ones
• Photograph each treatment stage for documentation
• Allow adequate absorption time before next construction activity
• Re-treat any area disturbed by subsequent construction work
• Obtain a written warranty certificate with clear terms

Environmental and health safety

Safety during application

IS 6313 explicitly warns: "The chemicals described in this code are insecticides with a persistent action and are to be regarded as highly poisonous. These chemicals can have an adverse effect upon health when absorbed through the skin, inhaled as vapours or spray-mists or swallowed."

Mandatory safety precautions:

• Workers must wear rubber gloves, boots, face masks/respirators, and full-sleeve clothing
• Provide soap and clean water for immediate washing in case of skin contact
• Keep chemical mixing and storage area away from food, water, and living quarters
• Do not smoke, eat, or drink during or immediately after handling chemicals
• Dispose of empty containers by crushing and burying — never reuse for any purpose
• Keep chemicals away from wells, water tanks, and water supply lines

Environmental considerations

• Chlorpyrifos has the highest environmental concern — toxic to aquatic organisms, can contaminate groundwater in sandy/permeable soils
• Imidacloprid is toxic to bees and other pollinators — handle runoff carefully near gardens
• Bifenthrin binds strongly to soil particles, limiting groundwater migration, but is highly toxic to fish

For projects near water bodies, wetlands, or ecologically sensitive areas, consider physical barriers (termite shields, mesh) instead of chemical treatment.

Leading pest control companies in India

For professional anti-termite treatment, work with established companies that have trained technicians, IS 6313 expertise, and the ability to provide meaningful warranties:

When selecting a contractor:

• Verify they use IS-certified chemicals from authorised manufacturers
• Ask for their EPEA or equivalent certification (for Imidacloprid application)
• Request references from recent projects of similar scale
• Insist on a written warranty — verbal promises have no legal value
• Verify their insurance coverage for chemical application work

How SiteSetu helps

Managing anti-termite treatment across multiple construction projects requires more than just IS code knowledge — it requires systematic tracking of treatment dates, chemical records, warranty certificates, and compliance documentation.

SiteSetu helps construction professionals:

• Track compliance — Record anti-termite treatment as a milestone in your project schedule, linked to the specific building/block
• Store documentation — Upload treatment certificates, warranty letters, and chemical test reports in the project document library
• Monitor warranties — Set reminders for warranty expiry dates and scheduled re-inspections
• Audit trail — Maintain a complete record of who treated what, when, and with which chemical — critical for RERA compliance

Frequently asked questions

Is anti-termite treatment mandatory for all buildings in India?

There is no single national law mandating anti-termite treatment for all buildings. However, it is effectively mandatory for: (a) all government/CPWD buildings through CPWD specifications, (b) all RERA-registered residential projects because termite damage falls under the 5-year defect liability, (c) all buildings constructed under state PWD contracts that reference IS 6313, and (d) all buildings in areas where municipal building bylaws or NBC/NBCS 2026 compliance is enforced. For private unregistered construction, it is technically optional but strongly recommended.

Can I do anti-termite treatment myself or do I need a professional?

For pre-construction treatment, you technically can do it yourself if you source IS-certified chemicals and follow IS 6313 procedures exactly. However, professional treatment is strongly recommended because: (a) warranty validity requires professional application, (b) chemical handling requires safety training, (c) incomplete application is the number one cause of treatment failure, and (d) professionals carry liability insurance. For post-construction drilling and injection, professional equipment is essential.

What is the difference between pre-construction and post-construction treatment?

Pre-construction treatment creates a continuous chemical barrier in the soil before the foundation and flooring are placed. Post-construction treatment attempts to create a barrier by drilling through existing floors and injecting chemicals into the soil below, plus treating the external perimeter. Pre-construction treatment is significantly more effective because it allows complete, uninterrupted coverage of the entire sub-floor area. Post-construction treatment typically costs 2-3x more and provides shorter protection.

How long does anti-termite treatment last?

With Chlorpyrifos: 5-8 years for pre-construction treatment, 3-5 years for post-construction. With Imidacloprid: 8-12 years for pre-construction (10-year certified warranty available). With Bifenthrin: 5-7 years. Actual duration depends on soil type, moisture conditions, chemical concentration, and completeness of application. Sandy, well-drained soils have shorter effective life than clayey soils.

Is chlorpyrifos safe to use inside buildings?

Chlorpyrifos is applied to the soil beneath the building, not inside the living space. When correctly applied during pre-construction (before flooring), human exposure is minimal. The IS code specifies it is "highly poisonous" and mandates protective equipment during application. After application and absorption into soil, the treated zone is sealed under concrete/flooring. Imidacloprid is considered safer for occupied building contexts due to its lower mammalian toxicity and reduced odour.

What should I check in an anti-termite treatment certificate?

A valid anti-termite treatment certificate should include: (a) name and address of the pest control company with licence number, (b) chemical used with IS specification number, batch number, and concentration, (c) date of treatment for each area, (d) total area treated in sq.m/sq.ft, (e) dosage rates applied, (f) warranty period and terms, (g) signature and seal of the supervising technician and company representative. Keep this certificate with your RERA documentation.

Can termites damage RCC structures?

Termites cannot eat concrete, steel, or stone. However, they can damage: timber door and window frames, wooden flooring, plywood and particle board furniture, paper files and books, electrical cable insulation (PVC), and fabric/carpet. In severe infestations, termites build mud tubes on the surface of concrete columns and beams to reach timber elements at higher levels. The structural concrete itself is not at risk, but the timber components embedded in or attached to it are vulnerable.

What happens if I find termites after the warranty period?

You will need to engage a pest control company for post-construction treatment at your own cost. Options include: (a) targeted drilling and injection at Rs 5-25/sq.ft depending on chemical and extent, (b) external perimeter treatment, (c) baiting system installation for ongoing colony management, or (d) combination of drilling plus baiting. If the building is a RERA-registered apartment, check whether the original treatment warranty has expired — if not, the developer is responsible for re-treatment at no cost to you.

Why do some buildings get termites despite treatment?

The most common reasons are: incomplete soil barrier (gaps at pipe penetrations, expansion joints, untreated backfill), subsequent construction activity that broke the chemical barrier (trenching for drainage, plumbing, cable laying), chemical degradation due to high soil moisture or alkaline soil conditions, substandard chemical concentration, and — in some cases — completely fraudulent treatment where the contractor sprayed water instead of chemical emulsion. This is why photographic documentation and third-party supervision are important.

Which IS code should I specify in my tender for anti-termite treatment?

Specify IS 6313 Part 2:2022 for pre-construction treatment and IS 6313 Part 3:2001 for post-construction treatment. Also reference the chemical specification standard: IS 8944 for Chlorpyrifos, IS 16131 for Imidacloprid, or IS 15936 for Bifenthrin. Include the dosage rates (5 l/sq.m horizontal, 7.5 l/sq.m vertical) explicitly in your BOQ to prevent under-application.