Considerations for Post Caps on Metal Fences

What happens here

When installing metal fence posts, it's generally recommended *not* to use post caps. While caps might seem protective, they can trap moisture inside the hollow posts, leading to rust and premature degradation over time due to expansion and contraction. Leaving the tops of the posts open allows water to drain and air to circulate, preventing moisture buildup and extending the lifespan of the posts. These particular posts are noted to be 'twice as thick' as average chain-link fence posts, indicating high durability even without caps.

Goal: Understand the rationale behind not using post caps on metal fence posts.