Do I need a mid rail for an 8' Tall fence?

A mid-rail is not necessary for an 8' tall Trex fence. Adding one is an option if so desired, but the fence is designed to be built up to 8' tall and 8' wide without mid rails. For commercial applications or places where an even stronger fence than the standard Trex configuration is required, a mid-rail will provide even more support and can easily be added by cutting the pickets in half and placing brackets midway up the post with a second bottom rail, which serves as the mid-rail. Our Architectural Drawings provide more details on our fencing components, including how to incorporate midrails.