Concrete Sleepers Brisbane is Queensland's premier supplier of high-strength concrete sleepers and galvanised steel posts for residential and commercial retaining wall projects. Our sleepers are manufactured to 55–60MPa — well above Australian standards — with a 60-year design life. We deliver QLD-wide and offer trade pricing for repeat customers. Quality you can build on.Concrete Sleepers Brisbane is Queensland's premier supplier of high-strength concrete sleepers and galvanised steel posts for residential and commercial retaining wall projects. Our sleepers are manufactured to 55–60MPa — well above Australian standards — with a 60-year design life. We deliver QLD-wide and offer trade pricing for repeat customers. Quality you can build on.