Sleeper and Landscaping Installation Guide
How to Choose the Right Sleepers
Railway sleepers are available in different sizes, treatments and finishes, and the best option depends on the project. This guide explains the main sleeper types and what to consider for raised beds, edging, steps, retaining walls and other garden features.
In this guide
- Before You Choose
- New Timber Sleepers
- Eco Sleepers and Smaller Landscaping Sleepers
- Reclaimed-Style Sleepers
- Choosing the Right Sleeper Size
- Raised Beds and Planters
- Garden Edging and Paths
- Retaining Walls and Level Changes
- Steps, Seating and Decorative Features
- Treatment, Colour and Appearance
- Fixings and Installation Requirements
- Common Choosing Mistakes
- Final Checks Before Ordering
Before You Choose
Start by deciding exactly what you want to build.
Timber sleepers can be used for:
- Raised beds
- Garden planters
- Lawn and path edging
- Steps
- Seating
- Decorative features
- Low retaining walls
- Dividing different garden areas
- Supporting changes in ground level
Before choosing a sleeper, consider:
- Finished project dimensions
- Required height
- Ground conditions
- Whether the timber will contact soil
- Whether the project will retain soil
- Preferred appearance
- Sleeper weight
- Access to the installation area
- Required fixings
- Future maintenance
Measure the full area and prepare a simple plan before ordering.
This will help calculate the sleeper lengths, number of courses and required brackets, screws or support posts.
New Timber Sleepers
New timber sleepers provide a clean and consistent option for most garden projects.
They normally offer:
- Regular dimensions
- Straight edges
- A more predictable appearance
- Easier cutting and fixing
- Pressure-treated timber options
- A cleaner finish than genuinely reclaimed sleepers
New sleepers are suitable for:
- Raised beds
- Planters
- Garden edging
- Steps
- Seating
- Decorative walls
- Low landscaping structures
Because timber is a natural material, some variation should still be expected.
This may include:
- Knots
- Grain variation
- Small splits
- Surface checking
- Colour differences
- Minor movement as the timber dries
These characteristics do not necessarily mean the timber is unsuitable.
Check each sleeper before installation and position the best visible face towards the finished side of the project.
Eco Sleepers and Smaller Landscaping Sleepers
Eco sleepers and smaller landscaping sleepers offer a lighter, more manageable alternative to full-size railway sleepers.
They can be useful for:
- Small raised beds
- Low planters
- Garden borders
- Path edging
- Children’s gardening areas
- Decorative features
- Dividing gravel, soil and lawn areas
- Projects with restricted access
At Harlow Fencing, our eco sleepers are available in:
- 75mm × 150mm × 600mm
- 75mm × 150mm × 1200mm
- 75mm × 150mm × 2400mm
Their reduced section makes them easier to:
- Carry
- Cut
- Position
- Fix together
- Use in smaller gardens
They may not provide the same mass or structural capacity as larger sleepers, so the intended use and required support should still be considered.
For taller structures or projects retaining substantial amounts of soil, a larger sleeper or more substantial support system may be needed.
Reclaimed-Style Sleepers
Reclaimed-style sleepers are intended to provide an older, more rustic appearance.
They may feature:
- Darker colouring
- Rougher surfaces
- Distressed edges
- Saw marks
- Natural splits
- Greater variation between pieces
This style works well for:
- Traditional gardens
- Rustic raised beds
- Informal landscaping
- Decorative walls
- Garden seating
- Features where a weathered appearance is preferred
Reclaimed-style sleepers should not automatically be confused with genuinely used railway sleepers.
Genuine used railway sleepers may have an uncertain treatment history and may contain creosote or other preservatives. Creosote-treated wood is subject to restrictions, and waste railway sleepers or creosote-treated timber may require specialist disposal rather than normal timber recycling.
For gardens, children’s areas and beds used to grow food, choose new timber sold as suitable for the intended application rather than timber with an unknown treatment history.
Choosing the Right Sleeper Size
The best sleeper size depends on the scale and purpose of the project.
Smaller sleepers
Smaller sections are useful for:
- Garden edging
- Small planters
- Low raised beds
- Decorative borders
- Lightweight projects
- Areas with difficult access
They are easier to handle but may need additional support on longer runs or taller structures.
Full-size sleepers
Larger sleepers provide:
- Greater visual impact
- More weight and stability
- Increased depth for retaining soil
- A substantial appearance
- More material for structural fixings
They are suitable for:
- Larger raised beds
- Seating
- Steps
- Low retaining walls
- Substantial garden features
Choosing the length
Long sleepers reduce the number of joints, but shorter lengths can be:
- Easier to transport
- Easier to carry
- Easier to position
- Better suited to corners and smaller projects
- More practical where access is restricted
Plan the layout around available sleeper lengths to reduce waste and unnecessary cutting.
Raised Beds and Planters
Timber sleepers are commonly used to create raised growing areas and garden planters.
Before choosing the sleepers, decide:
- Overall length and width
- Number of courses
- Finished soil depth
- Whether the bed will be freestanding
- Whether it will sit against a wall or fence
- Required access around the bed
- How the corners will be joined
- Whether internal bracing is needed
- How drainage will be managed
For beds used to grow vegetables, herbs or fruit, use new timber with a known treatment specification that the supplier confirms is suitable for the intended use.
Avoid using timber of uncertain origin or old creosote-treated railway sleepers around edible crops.
Raised beds should also be positioned so that:
- Water can drain
- Timber is not left in standing water
- Paths remain accessible
- Soil pressure does not push the sides outward
- Long sides are supported where required
A membrane may be used inside some projects to separate soil from the timber, but it should not trap water against the sleeper.
Garden Edging and Paths
Sleepers can form a strong edge between:
- Lawn and flower beds
- Gravel and paving
- Paths and planted areas
- Different ground levels
- Soil and decorative aggregates
For low edging, sleepers may be:
- Laid flat
- Installed on edge
- Partly recessed into the ground
- Fixed to timber or metal pins
- Joined with screws or brackets
Before installation, prepare a firm and level base.
Check:
- Finished edging height
- Path width
- Drainage
- Trip hazards
- Changes in ground level
- Mower access
- Required curves or corners
Smaller sleepers are particularly useful for low borders where a full-size sleeper would appear too bulky.
Retaining Walls and Level Changes
A retaining wall must resist pressure from the soil behind it.
The load increases with:
- Wall height
- Ground slope
- Wet soil
- Poor drainage
- Heavy material above the wall
- Vehicle or building loads nearby
Low decorative walls can often be built using sleepers fixed to suitable posts or supports.
Taller or heavily loaded retaining walls may require:
- Substantial posts
- Deeper foundations
- Drainage behind the wall
- Reinforcement
- Ground anchors
- Engineering advice
Do not assume that sleeper weight alone will hold back the soil.
Water trapped behind a wall can create significant additional pressure, so drainage must be considered before construction.
Where the wall is tall, supports a building or driveway, or could cause injury if it failed, obtain appropriate professional advice before starting.
Steps, Seating and Decorative Features
Sleepers can also be used to build:
- Garden steps
- Bench seating
- Borders
- Raised platforms
- Fire-pit surrounds
- Display areas
- Decorative walls
- Dividing features
For steps, consider:
- Consistent tread depth
- Consistent step height
- Secure foundations
- Slip resistance
- Drainage
- Firm fixing
- Safe access
For seating, choose sleepers with:
- A suitable visible face
- Minimal sharp edges
- No loose splinters
- A suitable treatment
- Secure supports
- Comfortable finished height
Sand or finish exposed surfaces where necessary.
Do not use treated timber where it will be exposed to excessive heat or direct flame, and never burn treated or preserved timber because it can release harmful pollutants.
Treatment, Colour and Appearance
Timber sleepers may be available with different treatments and finishes.
Pressure-treated sleepers
Pressure treatment helps protect the timber against decay and insect attack.
The initial colour may vary and generally changes as the timber is exposed to sunlight and weather.
Green-treated timber
Green-treated sleepers often have a natural green or light brown appearance when new.
The colour normally becomes more muted as the timber weathers.
Brown-treated timber
Brown treatment provides a darker initial appearance that may suit traditional garden projects.
Colour will still change over time.
Additional finishes
Sleepers can sometimes be finished with a suitable exterior:
- Wood stain
- Preservative
- Oil
- Paint
- Water-repellent coating
Make sure any additional product is compatible with the existing timber treatment and suitable for the intended application.
Freshly treated timber may need time to dry before being painted or stained.
Fixings and Installation Requirements
Choose fixings according to the sleeper size, layout and required strength.
Common options include:
- Timber-lock screws
- Sleeper screws
- Exterior coach screws
- Coach bolts
- Corner brackets
- Flat joining plates
- Straight sleeper pins
- Corner sleeper pins
- Timber support posts
- Reinforcing stakes
Horizontal sleepers
Sleepers laid horizontally can be joined using:
- Internal corner brackets
- Long timber screws
- Flat joining plates
- Overlapping corner joints
- Timber posts
Sleepers installed on edge
Sleepers installed vertically or on edge may require:
- Ground pins
- Support posts
- Concrete foundations
- External brackets
- Additional bracing
Use exterior-grade fixings compatible with treated timber.
Pilot holes may be needed near the ends of sleepers or when using larger fixings to reduce the risk of splitting.
Any freshly cut ends should be treated with an appropriate end-grain preservative.
Common Choosing Mistakes
Avoid these common problems:
- Ordering before measuring the project
- Choosing sleepers only by appearance
- Failing to consider sleeper weight
- Buying lengths that create unnecessary waste
- Using small sleepers for an unsuitable retaining structure
- Failing to support long sides of raised beds
- Ignoring drainage
- Allowing timber to sit in standing water
- Using genuine reclaimed railway sleepers without knowing their treatment history
- Using unsuitable timber around edible crops
- Forgetting brackets, screws and supports
- Failing to treat cut ends
- Assuming all sleepers have identical dimensions
- Building a tall wall without professional advice
- Failing to check access for delivery and installation
- Underestimating the amount of soil required for a raised bed
Final Check Before Ordering
Before ordering sleepers, confirm:
- Project type
- Finished length
- Finished width
- Finished height
- Sleeper section
- Required sleeper lengths
- Number of courses
- Number of sleepers
- Corner arrangement
- Required brackets
- Required screws
- Support posts or pins
- Drainage materials
- Membrane requirements
- Timber treatment
- Preferred colour
- Cutting requirements
- Delivery access
- Manual-handling requirements
- Whether professional design advice is required
Allow for a small amount of additional material where cuts, joints or site conditions may alter the final layout.
Prepare a sketch showing each sleeper length and joint before placing the order.
Need Help Choosing Sleepers?
Bring your measurements, photographs and project plan into our Harlow store. Our team can help you choose suitable sleepers, brackets, screws, pins and landscaping materials.
Before You Start
- Decide what you are building
- Measure the finished area
- Check the required height
- Consider ground contact
- Decide on the preferred appearance
- Check access for long or heavy sleepers
- Plan the fixings and support
Need Help with Your Measurements?
Bring your measurements, photographs and a simple sketch into our Harlow store. Our team can help calculate the panels, posts, gravel boards and fixings required.