Products

Timber Protection

Wood preservation is what Preschem was founded on. Decades of CSIRO-rooted formulation, field-trialled across every Australian climate zone, going where rot, fungi and insect attack start — inside the timber.

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Which timber preservative do I need?

Different problems need different products. The two questions that sort most of it: are you protecting sound timber or fixing timber that's already rotting, and can you reach the affected wood? Two safety checks first, then find your product.

Stop 1 — structural timber

Is the affected timber structural or load-bearing? Veranda posts, bearers, joists, rafters.

No product can restore rotted timber's strength. If it's structural, a qualified professional — a registered builder, building surveyor or structural engineer — decides whether it can be treated or has to be replaced.

It stops decay spreading. It doesn't put back what's gone.

Stop 2 — active termites

Live termites, or mud tunnelling in the structure?

Several of these products control termites in the timber they treat — but a treatment is localised to the timber it's applied to. None of them stops a colony or protects a whole structure.

An active infestation needs a licensed pest controller to deal with the nest.

Which product

Assuming both stops are clear

Build-in protection · the spots that rot first

No-Rot Rods

Protecting timber before it rots — especially the joints and end grain where it starts. Solid rods you drill in and leave, releasing slowly for years from the inside. Also the answer for rot you can't reach — a post set in concrete, or decay sealed inside a section.

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Fixes existing rot · paintable

No-Rot Gel

Above-ground timber that's already rotting, where you can reach the decay and will paint over it. A gel that diffuses into damp wood — works on wet and flood-affected timber. Not for ground contact — that's In-Ground Paste.

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The everyday preservative

Timber Preserver

General above-ground exterior timber — the everyday choice. A lighter copper preservative that soaks into the wood. Decks, fences, landscape timber. Leaves a green tint that browns off. Step down in cost from Heavy Oil.

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Clear · the borer answer

Clear Wood Preservative

Borer, and anywhere you can't have a green tint. Stays clear — no copper staining — so it suits finished or visible timber. The go-to for borer in sealed or external timber.

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Heavy-duty · trade

Heavy Oil Preservative

Weather-exposed structural timber people won't handle. A heavier oil that stays on the surface as a film — more waterproof and longer-lasting. Stays oily and stains skin, so it's for posts and bearers out in the weather, not handrails.

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For the groundline · 10+ years

In-Ground Paste

Timber at or below the groundline, set in soil. The highest copper load in the range, in a water-based paste — the only product here for ground contact. Field-tested to protect for over 10 years, the longest-lasting in the range.

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Deep protection · injectable

No-Rot Inject

Deep protection inside large structural timbers. A high-strength ready-to-use gel in a cartridge — spread it, inject it into pre-drilled holes or bandage it. Wall studs, bearers around wet areas, joinery. Formerly No-Rot Gel Industrial / Injection Grade.

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Polesaver Rods

Heavy-duty · poles & big posts

Polesaver Rods

Standing power poles, and large-section posts needing a bigger rod. Groundline decay control for poles in service — and the heavy-duty option when a standard rod isn't sized for the job.

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