Blackwood Concrete Under-Fence Plinth 50mm

The Blackwood concrete under-fence plinth (2340×200×50mm) closes the gap beneath Colorbond and timber fences in a deep dark finish — keeping pets and soil in, weeds and erosion out, and protecting fences on reactive clay sites. Australian-made, delivered Australia-wide by Retaining Walls Direct.

Written and product-checked by the Retaining Walls Direct team — supplying concrete retaining wall and fencing products across Australia. Last updated: June 2026.

Blackwood under-fence plinth 50mm

An under-fence plinth is a slim concrete strip that seals the gap at the base of a fence (or tops a low retaining wall). The dark Blackwood finish suits black Colorbond and modern fence lines, and is especially useful on reactive clay where ground movement opens gaps under fences.

Specifications

Why use an under-fence plinth?

• Seals the gap under fences — contains pets, soil and mulch.
• Stops weeds, erosion and washout along the fence line.
• Protects timber/Colorbond fences from ground moisture.
• Concrete — won't rot, warp or attract termites like timber.

Complete the job

Browse brackets & fixings, concrete sleepers and steel posts for the full system.

Buying with confidence

• Australia-wide delivery with a same-day freight quote.
• Google-reviewed service and trade support.
• Returns: no change-of-mind on made-to-order heavy goods; cancellations before dispatch refunded within 5 business days; faulty/incorrect always rectified — see our returns & delivery policy.

Send your postcode and quantities for a freight quote, or contact the team.

Frequently asked questions

What's an under-fence plinth for?
It closes the gap between the bottom of a fence and the ground.

What size and colour?
2340×200×50mm in dark Blackwood.

Can you deliver to me?
We deliver across most of Australia. Send your postcode and quantities for a freight estimate.