Freight is calculated based on your location and order size.We'll contact you with a freight cost within 1 business day before processing payment.
Heavy-duty treated pine timber sleepers (200×100mm, H4 CCA, in-ground rated) are a budget-friendly, natural-timber option for garden retaining walls up to about 1.0m in well-drained ground — with extra thickness for added strength. Available 1800, 2400 and 3000mm. Delivered Australia-wide by Retaining Walls Direct.
Written and product-checked by the Retaining Walls Direct team — supplying retaining wall materials across Australia. Last updated: June 2026.
The 100mm heavy-duty profile adds thickness over the standard 75mm timber sleeper for stronger low garden walls and edging. H4 CCA treatment makes them suitable for in-ground contact, resisting decay and termites better than untreated timber.
| Material | Treated pine, H4 CCA (in-ground rated) |
|---|---|
| Profile | 200mm × 100mm (heavy duty) |
| Lengths | 1800 · 2400 · 3000mm |
| Wall height | Up to ~1.0m in well-drained ground (confirm by site/engineering) |
| Brand | Retaining Walls Direct |
Timber is cheaper upfront and natural, but shorter-lived in ground contact. For a permanent or taller wall, our concrete sleepers last far longer with no maintenance — worth comparing before you buy.
Built with timber or galvanised steel posts set in concrete, with drainage behind the wall — see how to build a retaining wall and the drainage guide. Walls over 1.0m generally need engineering and approval (engineered walls over 1 metre).
Send your postcode and quantities for a freight quote, or contact the team.
Why choose 100mm over 75mm timber?
The thicker section adds strength for low garden walls and a more substantial look.
What does H4 mean?
H4 CCA rates the timber for in-ground contact, resisting decay and termites.
What sizes?
200×100mm, in 1800/2400/3000mm.
Can you deliver to me?
We deliver across most of Australia. Send your postcode and quantities for a freight estimate.
