Q&A for How to Install a Vinyl Fence

It is best practice to brace each post plumb (level) temporarily and at least 24 hours for concrete to fully harden.

Not strictly necessary, but strongly recommended.

Not recommended, as the wooden posts can rot and leave the vinyl posts without support.

There's no specific rule. It depends on the length and height of the fence sections, environmental factors such as wind load, cost considerations, and your own preference for appearance. Posts could be set anywhere from six to 20 feet apart.

Place the reinforcement rail in the bottom channel to prevent the fence from sagging. The reinforcement rail should look like a "C" or "U"; put the opening downward for best support.

Depends on the fencing. You can place wood supports inside them, but it sometimes doesn't matter with the manufacturer. You will need post supports at gates, though. They're metal and have enough room inside for the slats to be put in. If you are putting in support posts inside the vinyl, make sure you have room for the fence slats to be inserted. Otherwise, it's a huge pain to have to cut inside to ensure you have a proper fit.