Knee rail fencing is also called Ascot fencing, birdsmouth fencing, and diamond rail fencing.

It’s affordable and it’s also unobtrusive, the ideal style of wooden knee rail fencing used to define and mark boundaries. Heights are normally either 450 or 600 mm and rail lengths are up to 2.4/1.8m. Being low enough to step over, it provides no perimeter security function.

Knee rail fencing is particularly popular for use at schools, around car parks, alongside footpaths, and at sports fields and play areas.

Versatility & Benefits

Knee Railing acts as a strong deterrent to drivers who might otherwise stray from roadways and parking areas, as well as discouraging pedestrians from walking on planted borders or lawned areas. Unlike other types, timber knee rail fencing benefits from a natural aesthetic that is often sought by architects and specifiers.


Lay the rail in the top of the first post and nail, then join to the next post, to give post setting out distance. The rails should be nailed twice to secure to the post, using 75mm nails. Every rail should be joined by nailing a galvanized strap. The straps should be nailed twice either side using the 75mm nails.


Knee railing is a long-lasting fence that requires minimal maintenance, yet it can easily be repaired should the need arise.

It’s also mostly a natural material therefore, being that timber is a living product and given enough time it will degrade. To get the best possible life span from the product it is recommend that the timber is treated every 2 – 3 years. This is best undertaken with a solvent based treatment during the summer months, so that it can soak into the dry wood.