Post construction sub-slab injections target subterranean termite pathways that can bypass perimeter treatments and stop active colonies from entering a structure.

For effective post construction sub-slab injections start with a thorough inspection to locate likely entry points such as plumbing chases, construction joints, and areas with visible mud tubes. Use a slab drilling pattern based on soil type and slab thickness rather than arbitrary spacing; for sandy soils place holes every three to five feet and for heavier clays extend spacing to five to seven feet, always adjust for observed termite activity. Choose between a non-repellent liquid termiticide and bait cartridges based on site goals; non-repellents penetrate and transfer through worker movement while baits attract foraging individuals and can reduce colony vigor over time. When injecting liquids use low pressure and slow application so the product moves into voids and surrounding soil and avoid surface runoff by monitoring return flow at each hole. For bait cartridges install them in drilled holes or existing access points and check them on a monthly basis until feeding declines, then switch to quarterly monitoring. After application seal and patch each drill hole with a compatible mortar or epoxy and create a clear map of every injection and bait location with distances to fixed structure points for compliance and future retreatment planning.

Common mistakes include drilling with inconsistent spacing which leads to untreated corridors; avoid that by preplanning a grid based on soil and known pathways and mark each location before drilling. Another issue is overreliance on surface observation which misses under-slab activity; use probing tools and borescopes to confirm beneath the slab before choosing injection points. A third problem is failing to document work which complicates follow up and liability; record exact locations, products used, volumes per hole, and dates so future technicians can replicate or supplement the treatment accurately.

We run BigHomeProjects.com to help homeowners find trusted local contractors for treatments like sub-slab injections and to help contractors find work and connect with clients. We also host an active discussion community where homeowners and professionals share experiences, ask technical questions, and compare practical approaches.

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