Can I build a section wider than 8 ft on center?

The standard maximum width of a Trex Seclusions fence section is 96" on center (the center of post to the center of the next post), which makes the span between posts 91" nominal. It is always best to follow the standard installation guidelines, but if you need to (or have accidentally) set your posts further part, the method described in this link will help you adapt to the extra width. Using a combination of bands to cover seams and steel tubes to create longer internal rails, you can join pieces of Trex railing for extra width. For more details, download the instructions on how to create longer sections.