What is a Board-on-Board, Cap & Trim Fence?

Trex could most aptly be described as a board-on-board fence with a cap & trim top and a trim bottom. Trex Fencing has an upscale look based on (and approved upon) a popular wood fence style of fence.  

Here is an example of a board-on-board, cap & trim wooden fence with the addition of a trim piece at the bottom.

The Trex Fence system takes this style of fence to a new level:

• The pickets of a wood board-on-board fences can warp because wood pickets have a propensity to distort as they age and dry out. Trex pickets don't overlap -- they interlock. The interlocking system is an ingenious way of eliminating screws or nails while still fastening the fence together. The interlocking method creates the illusion of an overlap so the fence gives the appearance of a board-on-board design without the flaws. Learn more about how the unique design of Trex pickets can enhance your fence.
• The "cap-and-trim" aspect of the fence is also superior with Trex. Rather than using three pieces (a "cap" rail such as a 2x4 or 1x6 lying horizontally on top of the fence, and boards running underneath the cap on both sides to create the "trim"), Trex extrudes a one-part T-shaped top rail which slides over the tops of pickets. On a wood fence, it is common to see the cap rail curl up as it weathers or have the trim pieces pull off of the fence. With Trex, the top rail won't separate into pieces so it always has the clean look with its beautiful shadow lines and dimensions.
• Trex systems also include a bottom trim piece, which is not necessarily included with all wood fences. The bottom trim serves the functional purpose of hiding the heavy-duty aluminum bottom rail which supports the pickets while also contributing to the design of the fence. The picture frame appearance of the fence draws attention to the body's shadow lines and dimensions. 

Perhaps the most appropriate way of fully describing a Trex Fence would be ...

a picture-framed, board-on-board, cap & trim composite fence system.

This graphic illustrates how a Trex fence design accomplishes the appearance of a board-on-board, cap & trim look.

To learn more about using Trex Fencing pickets with wood rails and posts, visit our product page.