A Homeowner's Guide to Arris Rails and Closeboard Fencing

When homeowners begin researching fencing options, they often focus on the visible elements such as fence panels, posts and gates. However, some of the most important components of a strong and long-lasting fence are the structural elements hidden behind the finished appearance. One such component is the arris rail. While it may not be the most well-known fencing product, it plays a vital role in the strength and durability of traditional closeboard fencing. 

At Ash Fencing Supplies, we regularly help homeowners, landscapers and contractors choose the right fencing materials for their projects, and understanding the purpose of arris rails is an important part of that process. Read on as we explain what arris rails are, how they work and why they're an important part of a high-quality closeboard fence.

What are Arris Rails?

In short, an arris rail is a horizontal timber rail with a distinctive triangular cross-section. It is designed specifically for use in traditional closeboard fencing systems and provides structural support for the vertical feather edge boards that form the face of the fence. Unlike standard fence rails, the triangular design of arris rails helps improve strength while also allowing water to run off more easily. This reduces moisture retention and helps improve the longevity of the timber.

Typically manufactured from pressure-treated timber, arris rails are installed between fence posts and secured using metal arris rail brackets or mortised concrete posts, depending on the fencing system being used. Although most people may not immediately notice them, arris rails are one of the key components that give closeboard fencing its reputation for strength and durability.

What is Closeboard Fencing?

Closeboard fencing is one of the most popular fencing styles in the UK and is widely recognised for its robust construction and long lifespan.

Rather than using pre-manufactured fence panels, traditional closeboard fencing is built on-site using individual feather-edge boards fixed to horizontal arris rails. These boards overlap slightly, creating a solid and attractive boundary that offers excellent privacy and security.

Closeboard fencing is commonly used in both residential and commercial settings because it can withstand challenging weather conditions while maintaining its appearance for many years.

As fencing specialists, we often recommend closeboard fencing to customers looking for a reliable solution that combines strength, privacy, and traditional aesthetics. To find out more about closeboard fencing, take a read of our blog post “How Closeboard Fence Panels Transform Outdoor Spaces”.

Why are Arris Rails So Important?

Without properly installed arris rails, closeboard fencing would lack the structural support required to withstand daily wear and exposure to the elements.

The rails act as the framework that supports the feather-edge boards. They distribute pressure evenly across the fence and help prevent movement caused by strong winds or ground settlement.

Some of the key benefits of using quality arris rails include:

1. Improved structural strength - The triangular shape of an arris rail provides excellent load-bearing capabilities. This allows the fence to resist bending and movement more effectively than some alternative rail designs.

2. Increased longevity - Because the angled profile encourages water runoff, arris rails are less likely to suffer from standing moisture, helping to extend their lifespan when properly treated and maintained.

3. Better wind resistance - Closeboard fencing is often chosen for exposed locations because of its ability to withstand adverse weather. Arris rails play a significant role in providing the stability required for these conditions.

4. Support for larger fencing projects - Whether you're installing a small garden boundary or a long perimeter fence, properly fitted arris rails help ensure consistent strength throughout the structure.

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How Many Arris Rails Does a Fence Need?

The number of arris rails required depends largely on the height of the fence.

As a general guide:

• Fences up to 1.2 metres typically require two arris rails.

• Fences over 1.2 metres generally require three arris rails.

• Taller fencing installations may require additional support depending on site conditions and design specifications.

Using the correct number of rails is important to maintaining structural integrity. Cutting corners at this stage can lead to premature sagging, movement and unnecessary repair costs later. At Ash Fencing Supplies, we're always happy to advise customers on the appropriate materials and quantities for their projects.

Timber Posts or Concrete Posts?

One question we are frequently asked is whether arris rails can be used with both timber and concrete fence posts. The answer is yes. Traditional closeboard fencing is often constructed using timber posts and timber arris rails. However, many customers now choose concrete posts for additional durability and reduced maintenance requirements.

Concrete morticed posts are specifically designed to accommodate arris rails while offering excellent resistance to rot and weathering. This combination allows homeowners to enjoy the attractive appearance of traditional closeboard fencing while benefiting from the longevity of concrete support structures.

The Importance of Using Quality Materials

The performance of any fencing project depends heavily on the quality of the materials used. Inferior rails, untreated timber or poorly manufactured components can compromise the strength and lifespan of the entire structure. That's why it's important to source products from a reputable supplier with experience in fencing materials and installation requirements. At Ash Fencing Supplies, we stock a comprehensive range of fencing products, including arris rails, feather edge boards, fence posts, gravel boards, gates and all the components needed to build high-quality closeboard fencing systems.

Speak to Ash Fencing Supplies Today

Whether you're replacing an existing fence or planning a brand-new installation, understanding the role of an arris rail can help you make more informed decisions about your project. We supply quality fencing materials to homeowners, landscapers and contractors across Kent and the surrounding areas. We can help you choose the right products, calculate material requirements and make sure your fencing project is built to last. For expert advice on arris rails, closeboard fencing, and all your fencing supply needs, contact Ash Fencing Supplies today.