Pre-construction termite treatment for Long Beach additions, ADUs and new slabs

Most pre-construction work in Southern California uses liquid termiticide applied directly to the soil, because it puts the treated zone exactly where termites approach the slab: underneath. Non-repellent products are common because termites do not detect them and pass through the treated soil, carrying the active ingredient back to the colony.

Some owners prefer to rely on bait stations installed around the finished building. Baits work and avoid broad soil application, but they protect from the outside in, and they require ongoing monitoring visits on a schedule. On a slab that has not been poured yet, treating the soil underneath is usually the stronger first line, and baits can be added later as monitoring if you want both. We explain the tradeoffs for your specific site and let you decide.

Pre-treatment fails most often because of timing, not product. If the vapor barrier is already down, we cannot reach the soil. If the crew re-excavates a footing after treatment, the disturbed soil is no longer protected. A few simple coordination points make the visit work.

• Call us after under-slab plumbing and electrical are in and inspected, before the barrier and rebar
• Keep the pad free of form boards, wood scraps and stakes, which attract termites if buried
• Avoid regrading or trenching the treated area after our visit, or let us know so we can retreat
• Plan a separate trip for framing borate after the roof is on and before insulation
• Keep stucco and siding several inches above finished grade so the slab edge stays visible

Treatment is only part of protecting a new building. Construction details decide how easy it is for termites to get in later and how easy it is for an inspector to spot them. Leave a visible band of foundation between finished grade and the bottom of stucco or siding so mud tubes cannot hide behind it. Use pressure-treated sill plates on concrete. Avoid foam insulation that runs below grade on the exterior, since termites tunnel through it unseen.

On the drywood side, screen attic and soffit vents with fine mesh, prime and paint exposed wood such as rafter tails and fascia promptly, and caulk gaps in trim. Drywood swarmers look for small cracks in bare wood, and fresh lumber on an unfinished ADU is an open invitation during the late summer swarm season.

Many of the ADUs going up in Long Beach sit behind older homes in neighborhoods like Wrigley, Rose Park and Belmont Heights, where the main house often has a long record of termite treatment and the back of the lot holds old fence lines, stumps and buried debris. Those yards are prime subterranean territory, and a new slab dropped into them benefits from treated soil underneath from day one.

In the slab-foundation ranch tracts of Los Altos and Lakewood Village, owners are converting garages and adding family rooms that tie a new slab into a 1950s one. The cold joint between old and new concrete is the spot we treat most carefully. Near Naples and Alamitos Bay, sandy soil drains quickly, which affects how a liquid product spreads, so we adjust the application to the site. Swarm seasons matter too: if new framing will stand open between August and October, we recommend getting the borate on before drywood swarmers start flying.