How do I mount a Trex fence on top of concrete?
Trex Fencing can be mounted on top of a concrete pad or retaining because the hollow post design allows the Trex post to sleeve over the top of an embedded component such as a heavy duty steel pipe or wall mount. Because the inside dimensions of Trex posts are 3-3/4'' x 3-3/4'', the post can sleeve over preexisting mounts and anchored onto concrete.
There are several methodologies to mount Trex posts on top of concrete. Here are two concepts. Please note that these do not constitute official installation instructions from Trex or FDS. They are provided as guidelines. We encourage all customers to evaluate their installation needs to determine if the methods and applications you are planning to use will be viable options.
We do offer concrete post mounts and post donuts* that serve their purpose well for our 6 foot high fences in most cases. But if you're building a fence taller than 6 feet, or if you live in very windy areas, we recommend using a mount that is designed to provide more stability.
*If installing with a steel post, use 1-1/4" screws in lieu of the provided 1-5/8" screws.
In cases where the concrete has not yet been poured, heavy duty pipe can be set into the concrete and used as towers for Trex posts. This method is generally more secure than anchored mounts because the concrete holds the pipe without the risk of anchors pulling loose. Regardless of the mount method, you want the attachments to be sturdy and they need to fit the inside the dimensions of the Trex posts with some method of securing the post to the mount. If you have further questions, you can call our team of experts at 877-700-8739 and we would be happy to help you out.
Important note: Mounting a fence, Trex or otherwise, on top of concrete should be considered carefully. Ensure that your pad or wall are sufficient to support the fence. Anchors in a pad or on a narrow wall could break out with pressure from wind or other forces. If necessary, acquire engineering to determine if building a structure such as a privacy fence is a viable option for you.
This is an example of a poorly conceived project. In this case, the anchors for plated post mounts broke out the side of the concrete curbing after a post was mounted on top.
