How do I make my pickets interlock if the sections are more narrow than 8'?

Trex is sold in 8 foot wide sections, but the nature of the composite material allows you to cut the fence components like regular lumber. Because of this, 6 foot sections can be constructed if desired, or any section less than 8 feet wide for that matter. Many customers cut their sections back in order to fit spaces that just would not work for a full 8 foot section. 

Situations in which you would be shortening the span of the fence would require you to cut top and bottom rails to length, and then you would remove the needed amount of pickets from the section. Importantly, you would not want to cut, or "rip", the pickets in order to fit the shortened span. That would ruin the interlocking function and would cause problems in securing your fence section. Instead, you will need to adjust the spacing of the pickets accordingly. While this will affect how tight a few of the pickets are interlocked together, you can place finish nails through the knuckles of the pickets in order to secure them. 

Pages 12 and 13 of our Installation Guide shows you how to do this. Our Installation Resources include videos that give you a visual of how a fence section goes up which may also be very helpful.