Post construction pressure-injection into foundation voids is an effective way to reach and eliminate hidden termite colonies in concrete block cores and other foundation cavities.

When performing pressure-injection for post construction termite treatment start by conducting a thorough inspection to map block cores and voids that could harbor termites. Use a noninvasive probe and a borescope when possible to confirm activity and locate galleries before drilling. Drill ports into the block cores at the joint between the block and the footing or at the cavity crown to access the most likely paths of infestation; keep hole diameter small to preserve structural integrity and to allow neat sealing afterward. Choose between foam and liquid termiticides based on site conditions: foams expand to fill irregular voids and are useful where distribution is obstructed, while liquids provide deeper penetration along vertical and horizontal channels when voids are continuous. Apply pressure gradually and monitor return flow so you do not overpressurize and force material out into unintended gaps; if you see immediate visible expulsion of product back through adjacent joints pause and reassess port placement. After injection plug and seal ports with mortar or compatible patching material and restore finishes as needed, then schedule reinspection of cores on a regular basis to confirm treatment efficacy and to catch reinfestation early.

Common mistakes include drilling ports in the wrong location which can leave galleries untreated, so always locate ports at footing to wall intersections and along suspected flight paths; inaccurate product selection where a foam is used in continuous voids or a liquid where many irregular cavities exist, so evaluate void geometry and choose product accordingly; and inadequate sealing after treatment which allows termite reentry or moisture intrusion, so fill ports flush with compatible mortar and finish surface to original condition. Each of these has a simple fix: map and probe before drilling, match product to void type and follow label application rates, and use appropriate patching material and technique to restore the barrier and keep moisture out.

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