To stop sleepers (or landscape timbers) from moving, anchor them firmly to the ground and interlock them. Dig a shallow trench, lay a compacted gravel or concrete base for drainage, drive steel rebar or timber stakes deep into the soil, and secure the layers using heavy-duty timber screws or brackets.
You can use timber screws to secure fixing plates across timber lengths, and brackets to reinforce corner joints. Using timber dowel to peg through sleeper lengths provides additional strength and a traditional look. We recommend using dowel alongside timber screws to ensure the sleepers are really secure.
In conclusion, while you can lay railway sleepers directly on soil, it's important to take steps to prevent rot and ensure stability. With the right preparation—gravel for drainage, weed membranes, and perhaps some wood treatment—your sleepers will last much longer and remain an attractive feature in your garden.
Tips to Stop Sleepers from Rotting
You won't always need to cement sleepers in place. Flat or low edging usually sits on a compacted stone/sand base and is pinned with spikes or rebar. For upright sleepers, tall runs or retaining structures, concrete footings or post-set concrete are recommended for safety and longevity.
Laying sleepers directly on the ground gives way to rising moisture. This can cause further damage if water can't drain from under the wood, causing sleepers to warp or rot. Adding a layer of gravel or sand before placing wooden sleepers on top will help with drainage.
As a rule, hardwood oak sleepers tend to last the longest naturally with an expected lifespan of around 100 years. An untreated softwood will last for between three and five years if it sits on the ground, whilst treated softwoods can last between 20 and 30 years if they are maintained correctly.
Using wooden posts, metal stakes or railway sleepers are a common way of fixing railway sleepers together. 1) In really low level projects you will find that 50mm x 50mm wooden stakes are really useful in holding your railway sleepers in place. Simply knock them into the ground and screw the railway sleeper to them.
Clear Wood Oil or Decking Oil: These products are ideal for those who want their sleepers to age naturally to a grey or silver colour while still being protected from the elements. A clear oil will nourish the wood, making it supple and water-resistant, which helps protect it from water and frost damage.
Disadvantages of Wood sleeper
Reduce Soil Contact: Where sleepers must be placed in or near soil, line them with heavy-duty plastic sheeting. This moisture barrier helps keep damp earth away from the timber.
Warping and Splitting: Weather fluctuations can cause sleepers to warp or split, compromising the wall's integrity. Pest Damage: Timber can attract pests like termites, which may weaken the structure.
Flat Joining Brackets: Flat brackets are perfect for joining sleepers end-to-end in a straight line. This type of bracket is commonly used for long planter beds or pathways, where sleepers are laid in a continuous line.
Proven Joining Techniques
Pilot Holes: Mark two points at least 50mm from the edge of the first sleeper. Drill through the first timber and slightly into the second. Fixing: Drive 250mm structural screws through the face of the first sleeper into the end grain of the second.
New Oak Railway Sleepers will split and shake over time, especially so if placed in varying temperatures. If you are looking to make furniture that is free from this, then you need to purchase higher quality Kiln Dried material - this is something that TimberClick can also supply.
Consider using straps, metal tongs, trolleys, suction pads, wheelbarrows, skateboards etc.. So saying, sometimes you have to accept that some railway sleepers are simply TOO HEAVY to be safely manually carried down the garden.
Motor oil repels water and deters insects, effectively slowing down rot in outdoor wood, such as fence posts or barns. However, it is an unregulated, environmentally hazardous practice. It never fully dries, leaches into the soil, emits a strong odor, and poses toxicity risks.
Wood Preserver
It is best to apply a wood preservative before installation of your sleeper, so that you can paint all sides. It is also important that you add a thicker coat of the preservative to any sawn ends.
Reclaimed railway sleepers are likely to last for decades above ground if left untreated. This said, applying a wood preservative or wood oil will help to protect the timber for longer. Reproduction railway sleepers are usually made from Oak or Pine. They can be bought untreated and pre-preserved.
If you're placing your sleepers onto a hard surface, such as concrete or patio, they can just go straight on top, but if they're going onto the lawn or soil, you'll need to dig a shallow trench for the first sleeper to sit in.
A deadman anchor is a structural component buried in the soil behind a retaining wall and connected to it via a tieback (like a cable, threaded rod, or timber tie). It uses passive soil pressure and dead weight to resist the outward pressure of retained dirt, preventing the wall from bowing or leaning over.
How Long Will a Sleeper Retaining Wall Last? Estimated lifespans: Treated softwood sleepers: 8–15 years. Oak sleepers: 20–30+ years.
Pine sleepers that have been treated are made to withstand termite attacks, but in a few exceptional cases, termites may still invade if the level of treatment is not up to par or has diminished over the years.
Does Pressure-Treated Wood Rot in the Ground? Yes, it does. The preservatives slow decay, but constant soil contact and moisture eventually break down the wood. Posts last longer when installed with gravel bases or protective products like sleeves and post guards.
Installing sleepers vertically
Each of these sleepers needs to be treated as if it's a fence post and concrete separately into a hole at least 1/3 of the total heigh of the sleeper being installed, i.e. 1500mm sleeper would need to be buried 500mm into the ground.