How to Lay Sleepers for Garden Edging

Garden sleepers are a great way to add form, definition, and a rustic look to your outdoor space. You can use them to edge a flower bed, keep a border tidy, and even separate different areas of the garden. 

In this guide, we will walk you through the process of laying sleepers for garden edging. 

With a little planning and the right approach, you can achieve a smart, robust edging solution for a neat, organised, and character-filled garden. 

Planning and material selection 

Before you start to lay the sleepers for the garden edging, it is worth planning the process. This will help you achieve a neat and long-lasting finish. 

Firstly, you need to ask yourself a few questions: will your edging:

• Mark out flowerbeds? 

• Create a border between a lawn and a path? 

• Build up a raised edge for extra definition?

Once you’ve chosen the position, think about the overall look you want to achieve. 

• Straight sleepers give a clean, structured appearance 

• Gentle curves give a softer, more natural feel 

Choosing your timber: Softwood vs Hardwood sleepers 

Step 1: Preparation and trenching 

Preparing the area first will make the biggest difference to the finish quality and how long it’ll last. 

Firstly, mark out the position of the sleepers using string, stakes or a spray. This guideline will make it easier to follow when you’re laying them out. 

Clear the area of weeds, grass, stones, and debris; this helps ensure the ground is even. 

Once you are ready, you should begin by digging a trench along your guideline. The depth should be only as deep as required for your sleeper to fit firmly and evenly into position, ideally at least partway into the ground.

Tips for creating your trench: 

• A solid base will help to keep everything in place 

• Take your time and make sure it’s even 

• A trench for edging or raised beds only needs to be shallow, between 50 and 100mm, which should be enough

• Check the depth as you go 

• A small layer of compacted gravel can help with drainage and create a more stable base 

Step 2: Laying the first course

Once you’ve created a trench, start laying the first row of sleepers. Take your time, as a wonky first course will only spell disaster later on. 

Insert each sleeper into the trench, one by one, along the line you drew earlier, ensuring each rests securely on the bottom.  

Use a spirit level to ensure each sleeper is level and correctly aligned with the next. If necessary, add or remove soil or gravel under each sleeper to ensure it rests evenly and securely. 

Stand back every so often to check the overall line and stop uneven sections before you move on to the next. If you’re trying curved edging, take care to position each sleeper so the shape looks smooth and natural. 

Once the first course is in place, gently backfill around the base with soil and firm it down to hold the sleepers steady. You want a strong and tidy starting point. 

Step 3: Fixing and joining 

Secure the first set of sleepers and attach edging pieces if needed. This will ensure stability and prevent the sleepers from moving as the ground settles or the timber expands and contracts.

The type of fixing will depend on the edging design and whether you’re laying a single or multiple rows.

Simple garden edging 

Sleepers can be secured with timber stakes, long screws or metal fixing spikes driven into the ground behind the timber. 

Stacking sleepers 

These will need to be joined to create a solid structure. To secure stacked sleepers firmly, use long landscaping screws under 150mm or coach bolts fixed vertically through the top sleeper and into the one beneath. Position them regularly at 400-600 mm apart. For greater stability, stagger the joints as in brickwork and add extra support with steel corner brackets, flat plates, or internal timber stakes. 

Joining sleepers end-to-end 

Ensure that the ends are seated tightly and follow the border as neatly as possible. Not only does this make for a better-looking job, but it also helps to ensure that the edging feels more secure and professional in its construction.

Step 4: Finishing and preservation 

With the sleepers fixed in place, you can move on to the finishing touches. This stage is all about improving the final appearance and helping the timber withstand outdoor conditions. 

Once the edging is secure, backfill around the sleepers with soil and firm it down well to remove gaps and give the border a neat, settled look. 

Give it a final check for: 

• Uneven levels in the soil 

• Fixings 

• Alignment 

• Brush off any loose dirt 

• Tidy the area around it

For extra protection for your timber, you should apply a preservative or other form of wood treatment, provided this hasn’t already been done. This should help to prevent weather damage and other issues. 

For the best long-term results: 

• Make sure you get a preservative designed for outdoor timber 

• Pay particular attention to any cut ends and holes, as these are more vulnerable to moisture damage 

• Don’t rush this part – good preservative work will extend the life of your sleepers 

• Check your fixings and joints to ensure they are secure 

• Tidy the area around it to ensure it is weed-free and debris-free 

• Look for signs of damage

Once everything is finished, you can fill in your bed or border as you like.

Don’t forget that choosing quality sleepers from the outset is also important; well-made timber that’s suited to outdoor use will always give you better long-term performance.

Browse our range of sleepers at B&F Specialist Timber to find the right option for your garden project and get started on creating edging that is built to last.