Homes with Basements that are un-finished are treated by making a direct application to the sill-plate and adjacent areas (above the foundation wall). Crawl Space constructed homes will be treated using a ULV machine to "fog" the crawl area below, or dusted using a boric acid or borate dust as mentioned above. NOTE: Should the homeowner choose to have a more thorough treatment rendered to the crawl area (e.g. a direct application on the sill-plate and adjacent areas), this can be done for an additional fee. Factors include the absence or presence of sub-floor insulation (if insulation is present it will need to be trimmed or folded back); the overall accessibility of the crawl area, etc. SUB-NOTE: If it has been over a year since your crawl area was last inspected, you may with to consider having a "Full Inspection" of this area performed. Benefits include peace of mind in knowing if other problems are present (e.g. Rot, Termites, Leaks or other conditions conducive to pests).