3.6m x 100 x 100mm Knee Rail Fencing Top Rail Kit

3.6m x 100 x 100mm Knee Rail Fencing Top Rail

Knee Rail Fencing is a simple and attractive way to define boundaries while maintaining clear sightlines. Its low-level design is ideal for separating areas without creating a visually imposing barrier. Using the traditional birdsmouth jointing technique, horizontal timber rails are securely fitted to vertical posts to create a strong and durable structure.

Please note: Timber Knee Rail Fencing does not meet the specifications for highway use.

Strong Birdsmouth Construction

The birdsmouth joint uses a precisely cut notch in the timber rail, allowing it to sit securely onto the vertical post. This creates a strong connection between the rails and posts. Knee Rail Fencing is typically installed at around 450mm or 600mm high, making it easy to step over while clearly defining boundaries and discouraging access to areas such as lawns, flower beds and designated parking spaces.

Durable Tanalith E Timber

The 3.6m top rail is manufactured from 100 x 100mm Norway Spruce timber and treated with Tanalith E Green, a copper-based timber treatment designed to improve resistance to decay and outdoor conditions. The timber is supplied by a reputable UK sawmill, with timber predominantly felled in North Wales. FSC certification is available on request. As the treated timber weathers, its colour will naturally change from pale green to honey and eventually to a silvery grey.

Available Sizes & Components

First Fence also offers a 1.8m version and a smaller 75 x 75mm top rail option. Complete your Knee Rail Fencing with:

• Birdsmouth posts
• Galvanised fencing straps
• Galvanised nails
• Matching top rails

For the 100 x 100mm top rail, the Bishop's Hat style strap is recommended.

For 75 x 75mm rails, choose either the V-style or Shoe-style strap.

Ideal for Public Spaces

Knee Rail Fencing provides a cost-effective way to organise and define outdoor spaces, including:

• Car parks
• Pathways and walkways
• Lawns and flower beds
• Parks and public spaces
• Designated parking areas
• Pedestrian areas

It offers clear boundary definition without significantly restricting visibility, making it particularly useful where high-security fencing isn't required.

In-Ground Installation

Knee Rail Fencing is designed for in-ground installation. Posts should be installed at approximately 1.8m centres and secured using Post Mix. For a typical 450–600mm high installation, approximately half of the post length should be buried in the ground, with a minimum of two bags of post mix per post recommended. Although the timber is pressure treated, applying additional wood treatment to exposed ends is recommended to provide further protection and help extend the lifespan of the fencing.

Complete Your Knee Rail Fencing

Browse the full Timber Knee Rail Fencing range to find the posts, rails and accessories needed to complete your installation.

Contact Us

Need help choosing the right Knee Rail Fencing components? Contact our team on 01283 512 111, email sales@firstfence.co.uk or speak to us via online chat for advice and support.