Monthly Archives: September 2026

Retaining Wall Sleeper Posts: Matching Timber Size to the Right Steel Column

Stacked treated pine H4 retaining wall sleepers at Lifetime Pine's Cochranes Rd yard

Which steel post do you need for a sleeper retaining wall? It depends on the timber: 50mm sleepers pair with an economy column, 75mm with a 100UC, and 100mm with a 150UC. Here’s how to match them, plus spacing, and when Victoria requires a permit or an engineer.