Overview Quickset Concrete 20Kg is pressure-treated under vacuum/pressure impregnation with CCA preservative to achieve H4 Hazard Class retention levels, meeting the AS/NZS 1604 specification for direct soil contact and freshwater immersion. Consistently sawn to tolerance, these sleepers are used across Victoria for retaining walls, pergola posts, garden stairs, and rail-style edging where the warm timber aesthetic is preferred over concrete. Technical Specifications Species: Radiata Pine (Pinus radiata) or Hardwood - confirm on label Treatment: CCA to H4 (in-ground, freshwater contact) per AS/NZS 1604 Section size: Standard length: 1.8 m, 2.4 m, 3.0 m Moisture content: Green/partially seasoned (allow for on-site drying movement) Structural grade: F5 minimum (retaining wall use - consult engineer for walls > 0.9 m) Compliance: AS/NZS 1604 (preservative treatment), AS 4678 (earth-retaining structures) Best Applications Garden and driveway retaining walls (up to 0.9 m without engineer certification) Raised garden beds and planter boxes Rustic stairway steps and pathway edging Sub-floor stumps and bearer supports Temporary ground-level structures and site hoarding Delivery & Stock Timber sleepers stocked in multiple sizes at BuildBarn, 3 Eastlink Drive, Hallam VIC 3803. 24-48 h Melbourne Metro delivery available. Forklift-unload at your site can be arranged - advise at time of order. Volume and trade pricing available from the Hallam warehouse.