A slab-on-ground (also called slab-on-grade) foundation is one of the most common residential and light commercial construction methods worldwide. The concrete slab sits directly on a prepared soil base, serving as both the structural foundation and the ground floor. While slab-on-ground construction is cost-effective and structurally sound, it presents unique challenges for pest inspectors because it eliminates the accessible subfloor space that would otherwise allow visual detection of termite activity.
Pest Inspection Challenges
With a slab-on-ground foundation, termites can enter a building through concealed pathways that are virtually impossible to detect through routine visual inspection. Common entry points include cracks in the slab, construction joints, expansion joints, gaps around plumbing and electrical penetrations through the slab, and the slab edge where it meets the external walls. Unlike buildings with accessible subfloor spaces, there is no opportunity to visually inspect beneath the floor for termite shelter tubes or activity.
Termite Management Systems for Slabs
To address these risks, various termite management systems are designed specifically for slab-on-ground construction. Physical barriers such as stainless steel mesh or graded granite particles can be installed during construction beneath and around the slab edge. Chemical soil treatments applied before and after the slab is poured create a treated zone that deters termite entry. Reticulation systems allow chemical barriers to be replenished over time through permanently installed piping beneath the slab.
Inspection Requirements
When inspecting slab-on-ground properties, inspectors pay close attention to the slab edge, weep holes, expansion joints, and any visible cracks. They also examine interior skirting boards, architraves, and walls for signs of concealed termite activity. The inspection report should clearly note the limitations imposed by the slab construction and recommend appropriate monitoring strategies.
Managing Slab Properties
Tracking whether a termite management system is installed and when it was last serviced helps businesses provide proactive recommendations to their slab-on-ground clients.