Termites exploit imperfect slab to grade joints so slab edge retreatment is essential after construction.

When retreating slab edges post construction, start by performing a thorough inspection along the entire slab perimeter looking for gaps, voids, soft concrete, mud tubes and signs of moisture intrusion. For a trench and treat, dig a narrow trench about two to four inches wide and six to eight inches deep along the slab edge to expose the slab to grade interface, remove loose debris and apply a labeled liquid termiticide uniformly to the trench so it contacts both soil and slab. For injection around slab to wall joints use a low pressure injection wand and inject through grout holes or predrilled ports spaced every six to twelve inches targeting voids and cracks; keep records of hole locations and depths and seal ports after product set where required. Where access allows consider installing a corrosion resistant physical mesh under new concrete or at repair interfaces, anchored to the slab and extending into the treated soil to create a durable barrier; describe mesh placement to the contractor and ensure overlap and continuity at corners. For exterior porches and slabs where the soil is inaccessible lift edge capstones or remove small sections of paving and apply termiticide under the slab or within voids, then replace coverings and restore compacted soil to maintain drainage away from the foundation. Always follow label directions for application rates, personal protective equipment and reentry intervals and document treatments with sketches, dates, product names and concentrations for future inspections.

Common problems include missing voids behind grade beams where mud tubes remain hidden, so probe with a screwdriver and perform targeted injections or small openings to expose and treat those channels. Another frequent issue is improper liquid distribution when trench depth is too shallow or product is applied in a single spot, so maintain consistent trench depth and move along the perimeter applying measured volumes per linear foot. A third concern is recontamination from poor drainage causing soil movement and gaps at the slab edge, so correct grading, repair gutters and downspouts and backfill with compacted granular material after treatment to keep soil stable.

Our site BigHomeProjects dot com connects homeowners with local contractors and resources focused on home exterior and foundation issues including termite retreatment options. We host a discussion community where we and other members share experiences, ask questions and find contractors for specific slab edge and post construction treatment work.

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