Diamond Wood Rail Fences

Diamond Wood Rail Fencing

  • Also known as Knee Rail fencing or Birdsmouth fencing
  • Ideal for use for demarcation or around car parks
  • All timber used throughout is superior quality Jakcure® treated softwood guaranteed for 25 years
  • Galvanised strap for longer life
  • Planed finish


We aim to deliver most orders within 30 days
Most orders will be delivered within 7-10 days. Dependent on stock availability this may be longer on some items. Please call us for latest lead time if your order is time sensitive. Delivery charges are calculated at checkout based on your order value and postcode.
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Diamond Rail / Knee Rail Fencing

Posts for diamond / knee rail fencing with birds mouth top are 91 x 91mm in a softwood planed finish, available in lengths of 0.90m and 1.2m.

Rail for diamond / knee rail fencing are 70 X 70mm nominal section.  Standard rail length is 3.6m (200936) with posts spaced at 1.8m centres.  Posts can be spaced at 1.2m centres if a heavy duty knee rail fence is required.

​Galvanised strap to secure post to rails with 50mm nails (800710 for stainless steel or 800110 for galvanised).​

The following products can be used as rails but the above 3.6m rail is recommended.  2.7m rail with 1.35m post centres (640600) or 1.8m rail with posts spaced at 1.80m centres (640300) long. 

We have a number of fences used for demarcation, also view the following:

Post & Chain Fencing

Silver Rail Fencing

If you'd like to install this product yourself, take a look at our instructions by clicking the button below:

Installing Diamond Rail Fencing Instructions


Why is it called Birdsmouth fencing?

Birdsmouth post and rail is called so as the posts in which the diamond shaped rail sit into, look like an open birds mouth. 

Delivering an exceptional fence installation service

Approved Installers Network

Our network of Approved Installers are high skilled, carefully selected, reputable fence installers who we trust to install our high quality timber products to the highest installation standards. If you are interested in installation by one of our Approved Installers please click "Add installation to basket" below. We will be in touch shortly after processing your order to discuss installation.

Products in Diamond Wood Rail Fences

Buying multiple products?
Just update the quantities of each item you wish to buy and click 'Add all to basket'
Buying multiple products?
Just update the quantities of each item you wish to buy and click 'Add all to basket'

Related Products

Find related products for your order. If you cannot find the item you are looking for, please do not hesitate to call our friendly sales team.

This is Jacksons Fencing

We have developed this short film to showcase our unique processes which go into crafting our timber fencing, garden gates and accessories. It is these processes that allow us to offer our market leading 25 year guarantee and helped to establish our reputation for quality, service and our ability to make every garden beautiful.

Shopping with us

We offer the longest guarantee in the industry for manufactured timber products.

Featherboard Fence Calculator

Enter the run length and height, to calculate the items required:


You will need bays consisting of  posts,  pales,  rails and  Gravelboard(s).

To re-calculate simply change the requirements above.