Kordon: the deltamethrin treated-sheet termite barrier

Kordon is a treated-sheet termite barrier: a manufactured sheet that combines a physical membrane with a built-in termiticide. Made by Envu (formerly Bayer Environmental Science), it is a polyester webbing carrying deltamethrin, laminated between two UV-stable low-density polyethylene sheets (verified 2026-05-25, Envu Kordon). It is one of the recognised termite barrier systems for Australian construction and sits between a pure physical barrier like TermiMesh or Granitgard and a chemical soil treatment like bifenthrin, because it is both at once.

What it is

Kordon is a pre-fabricated sheet, not a poured or sprayed treatment. Its construction:

A polyester webbing core impregnated with a precise, consistent dose of deltamethrin (a synthetic pyrethroid), at 4 g/kg, equivalent to about 2 g/m2 (verified 2026-05-25, Kordon product label).
The webbing is sealed between two robust, UV-stable, low-density polyethylene sheets, which protect the active and give the sheet its physical strength.

Because the termiticide is locked inside a sealed sheet rather than spread through the soil, Kordon behaves as a combination physical-and-chemical barrier: the laminated sheet is a physical membrane, and the deltamethrin is there as the active backstop.

How it works

A termite cannot pass through the intact laminated sheet, and the deltamethrin layer deters and kills any that try to breach it. As with every compliant barrier, the point is not eradication of the colony but blocking the concealed entry paths and forcing any termite into the open, where its mud tube is visible at inspection. Kordon’s own record is the selling point here: the manufacturer reports no termite penetrations across 120,000-plus Australian installations since 1996 (verified 2026-05-25, Kordon documentation).

As with any sheet or membrane barrier, the protection depends on the sheet being continuous and correctly terminated. The weak points are the joins, the laps, and the penetration collars, not the flat sheet.

Where it is installed

Kordon is fitted during construction at the concealed entry points:

As a perimeter barrier at the slab edge and around the base of the building.
As collars around every service penetration through the slab.
Under or through the slab/wall junctions per the certified detail.

It is installed as the slab and brickwork go up, so it has to be programmed into the build at the right stage, not retrofitted.

Standards and certification

AS 3660.1 and AS 3660.3. Kordon meets AS 3660.1:2014 for new building work and is tested to AS 3660.3:2014 section 5.5 “Treated Sheet”, which is the assessment path for this product type (verified 2026-05-25).
CodeMark. Kordon holds CodeMark certificate GM-10-CM30001, the ABCB product certification, covering 50-plus years durability and resistance to penetration by Mastotermes darwiniensis (verified 2026-05-25, ABCB CodeMark scheme). That Mastotermes coverage is why Kordon is one of the systems accepted in the Northern Territory, where the giant northern termite limits the product list.
State requirements. The certification covers the Queensland 50-year design-life requirement and the NT Mastotermes requirement, so Kordon travels across jurisdictions.

Warranty and who installs it

Kordon carries a 50-year warranty and must be installed by an authorised, accredited installer: installers complete Kordon accreditation and training and are assessed as competent in the physical-termite-barrier installation unit. It is not a builder DIY product, and the installer’s certificate forms part of the building’s termite-management documentation.

Kordon versus the other barriers

	Kordon (treated sheet)	TermiMesh (stainless mesh)	Granitgard (graded stone)	Bifenthrin (chemical soil)
Type	Physical sheet + chemical	Physical, mechanical	Physical, particle	Chemical, soil
Active	Deltamethrin (in sheet)	None	None	Bifenthrin (in soil)
Standard path	AS 3660.3 treated sheet	AS 3660.1 physical	AS 3660.1 physical	AS 3660.1 chemical
Typical life	50-year warranty	Long (alloy-dependent)	50-year warranty	~10-year label
NT Mastotermes	Certified	Physical (resists by aperture)	Physical	Check product
Install by	Accredited installer	Accredited installer	Accredited installer	Licensed pest tech

All four are recognised, compliant systems. Kordon is often described as the volume premium choice for a treated-sheet barrier in the southern states; the choice between it and the alternatives comes down to the build detail, the budget, whether a chemical-free system is wanted, and the installer’s preference.

For a builder

Program the accredited installer in. Kordon goes in as the slab and brickwork are built; book it into the sequence.
Protect the sheet and the collars. The continuity is everything; do not breach a laid sheet or add a penetration after the fact without getting the installer back to detail it.
Use the NT/QLD certification when it matters. In the Northern Territory or Queensland, Kordon’s CodeMark coverage of Mastotermes and 50-year durability is the reason it qualifies; keep the certificate.
Durable notice and inspections still apply. Record the installed system on the durable notice, and remember the home still needs ongoing annual inspections and a clear inspection zone.