RR wrote:
We need to replace our redwood fences. One neighbor claims that
untreated redwood is more rot reistant than treated wood.

Can anyone tell me what fence post is more resistant to rot and
insects: pressure treated posts or untreated redwood?

Is the brown pressure treated wood better than the green treated wood?

Is there some website that you can direct me to that shows this
information.
thanks in advance

You want a rot-resistant post?

Steel posts in a concrete base with wood 4x4 bolted to the post.