Do Post Supports Rust Over Time?

Post supports are metal brackets designed to hold timber posts securely in place. They are commonly used for fences, pergolas, gazebos and decking. A common question people ask is whether post supports will rust over time. 

In Short

Yes, metal post supports can rust eventually. However, our modern post supports are designed to resist corrosion and last for many years outdoors. 

Rust occurs when metal is exposed to moisture and oxygen over long periods. Since post supports are used outside, they are exposed to rain, damp soil and changing weather conditions. Without protection, this could lead to corrosion. 

How Post Supports Prevent Rust 

Quality post supports are usually treated to protect the metal. One of the most effective methods is hot-dip galvanising, where steel is coated with a protective layer of zinc. This coating helps prevent moisture from reaching the metal and slows down corrosion. 

At Speedy Fixings, our post supports are hot-dipped galvanised to a minimum of 70 microns after manufacturing. This protective layer helps the mild steel resist rust and increases the lifespan of the support. 

Stainless steel options are also available. Stainless steel naturally resists corrosion, making it a good choice for areas with high moisture levels. 

Which Type is Best for Your Project? 

• Heavy-duty post supports are the strongest option, typically weighing up to 12kg. These are best suited for structural or load-bearing applications such as pergolas, large fencing and decking. They are usually bolt-down supports fixed with concrete anchors for maximum stability. 

• Lightweight post supports are designed for lighter applications such as standard garden fencing. They are easier to handle and install but still provide reliable support when fixed correctly to a solid base. 

• Elevated post supports are specifically designed to raise timber posts off the ground. By creating a gap between the timber and the surface, they improve airflow and significantly reduce moisture build-up, helping to prevent both rust on the metal and rot in the timber. Adjustable options are also available where slight height changes are needed. 

Added Protection for Timber Posts 

Post supports also raise timber slightly off the ground, which helps prevent water damage, fungal decay and insect problems. 

Elevated post bases are especially useful because they create space between the timber and the ground, improving airflow and reducing moisture build-up. 

To Summarise 

While metal can rust over time, good quality post supports are designed to minimise corrosion and last for many years. Choosing durable Post Supports by Speedy Fixings and installing them correctly will help keep timber structures stable and protected.