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Termite barrier

A termite barrier protects Class 1 and Class 10 builds from termite ingress. AS 3660.1:2014 categories, durable notice rule, and 50-year design life explained.

By Chalkline. Last updated 14 May 2026. Verified 14 May 2026.

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A termite barrier is a permanent system installed during construction to prevent subterranean termite ingress into a building. The NCC requires one on every Class 1 (dwelling) and attached Class 10 (carport, garage) build in a termite-prone area, unless every primary structural element is non-susceptible material per AS 3660.1 Appendix C.

The governing rules sit in NCC 2022 Volume Two clause H1D3 and ABCB Housing Provisions Part 3.4. AS 3660.1:2014 (Amendment 1, September 2017) is the referenced standard.

Three categories under AS 3660.1:

  • Physical barriers: stainless-steel mesh (TermiMesh), graded stone particles (Granitgard), or impregnated polymer sheeting (Homeguard, Kordon). Termites cannot pass through; ingress is forced to a visible inspection zone.
  • Chemical barriers: reticulated soil treatment or perimeter spray using a registered termiticide (Termidor fipronil, Biflex bifenthrin). Applied by a licensed pest management technician.
  • Combined systems: physical at the slab perimeter plus chemical for service penetrations, or membrane plus reticulated re-treatment.

50-year design life rule. A barrier must have a design life of at least 50 years, unless it is readily accessible for replenishment or replacement. Chemical reticulated systems satisfy this by allowing re-treatment through a fixed pipework grid; one-shot soil treatments do not.

Durable notice. ABCB Housing Provisions clause 3.4.3 requires a permanent notice fixed in a prominent location (typically the electrical meter box) stating the system installed, install date, chemical life (where applicable), and inspection schedule. Without the notice, the system is non-compliant even if correctly installed.

The most common failure mode is bridging: soil, mulch, paving, or render placed above the barrier creates a concealed termite route around it. Builder, landscaper, and homeowner all need to know the barrier line so it stays uncovered.

Also known as: termite management system, TMS, termite protection system.

Category: Compliance / site preparation / pest management.

See also

Last updated: 2026-05-14. Verified: 2026-05-14.

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