{"product_id":"treated-pine-sleeper-75mm","title":"Treated Pine Timber Sleeper H4 CCA 75mm","description":"\u003cp\u003eAfter 50 years building retaining walls across Australia, I've seen timber sleepers done right and done wrong. H4 CCA treated pine at 75mm is a legitimate, cost-effective choice for garden walls, low-level embankments, and landscaping applications — provided you understand what it can and can't do, and you install it correctly.\u003c\/p\u003e\n\u003cp\u003eThese sleepers are kiln-dried and pressure-impregnated with CCA (Copper Chrome Arsenate) to H4 hazard level — the Australian standard for in-ground contact. That means they're rated for direct soil contact, resistant to termites, rot, and fungal decay, and compliant with \u003ca rel=\"noopener noreferrer\" href=\"https:\/\/www.standards.org.au\/standards-catalogue\/sa-snz\/building\/bd-002\/as--1604-dot-1-2005\" target=\"_blank\"\u003eAS 1604.1\u003c\/a\u003e for preservative treatment of timber.\u003c\/p\u003e\n\u003ch2\u003eWhat 75mm Treated Pine Sleepers Are Best For\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eGarden retaining walls up to 600mm finished height\u003c\/li\u003e\n\u003cli\u003eRaised garden beds and planter boxes\u003c\/li\u003e\n\u003cli\u003eLow-level embankment stabilisation\u003c\/li\u003e\n\u003cli\u003eLandscaping borders and edging\u003c\/li\u003e\n\u003cli\u003eSteps and terracing in residential gardens\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eImportant:\u003c\/strong\u003e For walls over 600mm, or walls near boundaries, structures, or with any surcharge load (driveway, vehicle, stored materials), you should be looking at \u003ca href=\"\/collections\/concrete-sleepers\"\u003econcrete sleepers with galvanised steel posts\u003c\/a\u003e. Timber at 75mm is not the right specification for structural retaining walls under load. I've rebuilt too many failed timber walls to recommend otherwise.\u003c\/p\u003e\n\u003ch2\u003eProduct Specifications\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eThickness:\u003c\/strong\u003e 75mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWidth:\u003c\/strong\u003e 200mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLengths available:\u003c\/strong\u003e 1.8m, 2.4m, 3.0m\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTreatment:\u003c\/strong\u003e H4 CCA pressure-impregnated — rated for in-ground contact\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStandard:\u003c\/strong\u003e AS 1604.1 compliant\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFinish:\u003c\/strong\u003e Rough-sawn, natural pine\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eColour:\u003c\/strong\u003e Natural green-brown (treatment colour fades to grey over time)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eInstallation Notes — From the Field\u003c\/h2\u003e\n\u003cp\u003eTimber sleepers are forgiving to work with — they cut easily, accept screws and bolts, and don't require specialist equipment. But the basics still apply:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDrainage is non-negotiable.\u003c\/strong\u003e Even for low garden walls, water build-up behind the sleepers accelerates rot at the base and causes premature failure. Install \u003ca href=\"\/collections\/drainage-kits-ag-pipe-weep-holes\"\u003eag pipe and drainage aggregate\u003c\/a\u003e behind the wall.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePost embedment matters.\u003c\/strong\u003e If you're using timber posts or steel posts with timber sleepers, the in-ground portion should be at least one-third of the total post length.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDon't skimp on fixings.\u003c\/strong\u003e Use hot-dip galvanised or stainless steel bolts and brackets — standard zinc-plated fixings will corrode in contact with CCA-treated timber. See our \u003ca href=\"\/collections\/hardware-brackets-cleats-rwd\"\u003eretaining wall hardware range\u003c\/a\u003e.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCheck your council rules.\u003c\/strong\u003e In most Australian states, walls over 1.0m require approval. Some councils have lower thresholds. See our \u003ca href=\"\/blogs\/news\/retaining-wall-height-limits-council-approval-australia\"\u003eguide to retaining wall height limits and council approval\u003c\/a\u003e.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eTimber vs Concrete — Honest Advice\u003c\/h2\u003e\n\u003cp\u003eTreated pine sleepers at H4 will last 10–15 years in most Australian conditions — less in wet climates, heavy clay soils, or coastal environments. Concrete sleepers with galvanised steel posts will last 50+ years. For a garden bed or low landscaping wall where aesthetics and budget are the priority, timber is a reasonable choice. For anything structural, anything over 600mm, or anything you don't want to rebuild in a decade, concrete is the right call.\u003c\/p\u003e\n\u003cp\u003eCompare your options: \u003ca href=\"\/blogs\/news\/concrete-sleepers-vs-timber-sleepers\"\u003eConcrete sleepers vs timber sleepers — which is better?\u003c\/a\u003e\u003c\/p\u003e\n\u003ch2\u003eDelivery\u003c\/h2\u003e\n\u003cp\u003eWe deliver treated pine timber sleepers to job sites across Australia. Sleepers are heavy — please ensure site access is suitable for delivery vehicles. Contact us to confirm delivery lead times and freight costs for your location.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"\/pages\/contact-retaining-wall-direct\"\u003eGet a delivery quote for your area\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eCompliance \u0026amp; Standards\u003c\/h2\u003e\n\u003cp\u003eThese sleepers are treated to \u003ca rel=\"noopener noreferrer\" href=\"https:\/\/www.standards.org.au\" target=\"_blank\"\u003eAS 1604.1\u003c\/a\u003e H4 hazard level — the Australian standard for timber in direct ground contact. For retaining wall design and construction, refer to \u003ca rel=\"noopener noreferrer\" href=\"https:\/\/www.standards.org.au\/standards-catalogue\/sa-snz\/building\/bd-002\/as--4678-2002\" target=\"_blank\"\u003eAS 4678-2002 Earth-Retaining Structures\u003c\/a\u003e. For walls requiring council approval, engineering certification from a licensed structural engineer is typically required.\u003c\/p\u003e","brand":"RetainingWallsDirect","offers":[{"title":"1800mm","offer_id":52125643342104,"sku":"TPIN-75-1800mm","price":25.23,"currency_code":"AUD","in_stock":true},{"title":"2400mm","offer_id":52125643374872,"sku":"TPIN-75-2400mm","price":33.0,"currency_code":"AUD","in_stock":true},{"title":"3000mm","offer_id":52125643407640,"sku":"TPIN-75-3000mm","price":42.05,"currency_code":"AUD","in_stock":true}],"url":"https:\/\/www.retainingwallsdirect.com.au\/products\/treated-pine-sleeper-75mm","provider":"Retaining Walls Direct","version":"1.0","type":"link"}