The use of concrete sleepers has seen a surge in construction and gardening projects because they are robust, slender, and adaptable. They are traditionally used to make retaining walls, garden edgings, and stairs, and they add a further and novel touch to outside areas. The usual query residents have during installation, however, is—must concrete sleepers be installed straight onto the earth, or should they have supporting groundwork underneath them?
The Concrete Sleeper Installation Manual
Proper earth work and proper equipment are crucial to the successful installation of quality concrete sleepers for Bendigo. Though such sleepers are designed to be long-lasting, on which bedrock they’re installed is to some extent responsible for their longevity over time. Trench digger, bubble level, and soil compactor are just some of the equipment needed, as is the foundation and backfill material.
Typically, the procedure involves site preparation through clearing of rubbish and levelling the surface. A trench is dug for laying the sleepers horizontally in place. Alignment is critical because a faulty base will result in instability or unevenness, particularly when the sleepers experience pressure from load or weathering conditions.
Can Concrete Sleepers Be Laid Directly on the Ground?
Yes, in some cases, concrete sleepers may be placed directly onto the ground. The advantage of this is that it is simple—it avoids the expense and time of groundwork, so is best suited to small or non-loading applications like garden edging.
But placing concrete sleepers directly on the ground also has its own disadvantages. Eventually, soil shift due to water absorption, erosion, or settlement of the ground may cause uneven settling or sinking of the sleepers, particularly on loose or unfirm soils. That could compromise your project’s durability and aesthetic appeal.
Also, placing the sleepers on the ground directly leads to poor drainage, in which water damage or pooling can ensue below the building. The activity is best where the ground is firm and draining. Even in this case, preventive actions like compacting soil or introducing a thin course of coarse sand will improve stability and prevent any issues.
Alternatives for Fitting Concrete Sleepers
For a longer and more lasting fitting, use other means that have a prepared base. One of the most common practices is using a concrete base. By casting a concrete strip on which you are going to set the sleepers, you get a solid and level base which is resistant both to earth movement and to the vagaries of weather. Though more work and expense up front, this will extend the lifespan of the structure considerably.
Another alternative is a gravel or sand base. Place a level thickness of sand or gravel down in the trench once it has been graded. This gives a less rough surface to the sleepers and offers better drainage, reducing problems associated with ground contact. Sand and gravel bases offer an excellent compromise between cost and performance, and are thus a popular choice with homeowners.
In comparison, concrete foundations have maximum strength at maximum cost, and sand and gravel offer compromise of stability at cost. Sleepers on the ground is the least expensive method, but better suited for short-term or low-stress use than to permanence or to bearing load.
Choosing the Best Solution for Your Project
Laying concrete sleepers on the ground is more a function of project size, soil class, and your priorities for long-term performance. For small garden borders or for ornamental purposes, direct laying can be very successful with minimal problem. For walls such as retaining walls, where stability is critical, it’s well worth going to the extra trouble and creating a suitably prepared base—concrete or gravel.