7 Installation Errors to Avoid with Post and Rail Fencing
Introduction
Post and rail fencing is a popular choice for properties in both rural and semi-rural settings. Known for its straightforward design, open visibility, and cost-effectiveness, it’s commonly used to define boundaries, keep livestock secure, or simply enhance the look of a garden or field. But despite its simplicity, improper installation can lead to structural issues, reduced lifespan, and unnecessary costs.
At Fast Fix Fencing Swanley, we’ve seen firsthand how cutting corners during installation leads to avoidable problems for homeowners and landowners across Swanley and the wider Kent area. Here are seven common post and rail fencing errors you should avoid to ensure a secure, long-lasting result.
1. Inadequate Post Depth
A frequent mistake is not setting posts deep enough into the ground. Shallow posts are more likely to wobble, tilt, or be pushed over by strong wind or pressure. Posts should typically be buried at least a third of their height, depending on soil conditions and fence purpose.
What to do instead: Dig post holes deep enough for stability and backfill with concrete or compacted earth to secure them properly.
2. Using Untreated Timber
Post and rail fencing is constantly exposed to the elements, and using untreated wood leads to rapid rot, especially at ground level. This dramatically reduces the fence’s life expectancy.
What to do instead: Always use pressure-treated timber designed for outdoor use to prevent decay and insect damage over time.
3. Uneven Spacing Between Posts
Inconsistent spacing between fence posts can cause rails to sag or leave unsightly gaps. Posts that are too far apart will also reduce the overall strength of the fence.
What to do instead: Maintain consistent spacing—typically between 1.8m and 2.4m—depending on the style and materials of the fence.
4. Ignoring Ground Level Variations
If the ground isn’t levelled or considered during installation, the fence will look uneven or leave gaps that can let animals escape. Uneven posts also affect the appearance and performance of the entire structure.
What to do instead: Adjust post height based on the terrain and use string lines to maintain visual consistency, even on sloped land.
5. Incorrect Rail Fixing Techniques
Poor rail attachment—such as nails that are too short or incorrectly placed—can lead to rails loosening or breaking away from posts. Over time, this creates structural instability and an unattractive finish.
What to do instead: Use galvanised screws or strong nails that are weather-resistant and ensure rails are securely fastened into the face of each post.
6. No Consideration for Ground Conditions
Wet, sandy, or clay-heavy ground requires different installation techniques. Installing posts without accounting for local soil conditions can result in early leaning or failure of the fence.
What to do instead: Assess the soil type and use appropriate methods for setting posts, including deeper holes or additional drainage where necessary.
7. Failing to Plan for Expansion and Contraction
Timber expands and contracts with temperature and moisture changes. Failing to allow for natural movement can lead to split rails or warped posts.
What to do instead: Leave small expansion gaps and avoid overtightening fixings. This helps accommodate natural movement and increases the longevity of the fence.
Conclusion
Post and rail fencing is effective, durable, and attractive—but only when installed with care and experience. Avoiding these seven common mistakes ensures a fence that stands up to the elements, looks professional, and lasts for years to come.
At Fast Fix Fencing Swanley, we take pride in delivering quality workmanship that adds real value to your property. If you’re planning a new fence in Swanley or anywhere in Kent, get in touch with our team today for expert advice and a flawless installation from start to finish.
Call us on: 01322 952 295
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