How to Install a Vinyl Privacy Fence - Tennessee Valley Fence | You ..Part 6: Post Cap Installation. Install post cap on post by applying PVC glue on the inside of the cap. Part 7: Installing Gates. Preparing Gate (Example is for a 41″ Gate). Set privacy fence gate posts 43″ apart to allow for hardware and gate. Gates are 41″ wide with a 2″ gap to accommodate hinge and latch. Set traditional.