- 2068 Chaitra · 4 marks
Post construction anti-termite treatment
Short answer
Post-construction anti-termite treatment uses chlorpyrifos or imidacloprid emulsion as per IS 6313 (Part 3). Inside, holes are drilled at wall-floor junctions and the chemical is injected under pressure. Outside, a trench is dug, soil treated, and backfilled. Cracks, voids and wood are also injected, with annual inspections to maintain the barrier.
Explain briefly about post construction antitermite treatment.
Post-construction treatment is done in an already built building to kill termites present and to build a chemical barrier outside and inside, as per IS 6313 (Part 3). It uses the same chemicals (chlorpyrifos or imidacloprid emulsion) as the pre-construction method.
- Inspection: Find the entry points, mud tubes, damaged wood and nests.
- Treatment of the plinth (inside): Drill holes of about 12 mm diameter at 300 mm centres along the junction of wall and floor, in the floor next to the wall; inject the emulsion by pressure (about 7.5 litres per running metre) and seal the holes with cement mortar.
- Outside soil treatment: Dig a trench about 300 mm wide and deep along the external perimeter, treat the soil at about 7.5 litres per running metre of trench, and backfill in layers while sprinkling the emulsion.
- Treatment of cracks and voids: Drill and inject the chemical into wall cracks, expansion joints, and behind skirting.
- Treatment of wood: Spray or inject termiticide into wooden frames, and replace badly damaged members.
- Nests: Destroy visible mounds by digging and pouring the chemical.
- Follow-up: Re-inspect yearly; repair any breaks in the barrier.
✓ Answer checked by Claude Opus 5.5 (high effort)
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