Trex is an integrated system of extruded components.
It is not dimensional composite lumber like decking.
If you are looking for composite pickets only, the Seclusions pickets are made to interlock. They are not flat boards to mount to back rails, although they could be attached this way by screwing through the edges.
Trex is a composite materials brand. If the profiles you want are anything other than what can be found on TrexFencingFDS.com or Trex.com, they are not Trex profiles.
If the Trex Seclusions picket simply won't work for your project, you could look into Trex composite decking boards. Just so you know, they are a full 1" so they are quite heavy. We don't work with the decking profiles so visit Trex.com to find a supplier or contractor near you.
We do not sell competing composite products and aren't able to help you source them. Other composite manufacturers are typically short-lived so unless you are using actual Trex brand materials, we aren't able to provide support for replacement parts in the future.
If you have a spec and it is not calling specifically for the Seclusions design, we recommend upgrading to Seclusions. If you require technical documentation, you can find shop drawings, installation guides, product information, pictures, videos and other resources on our website.
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