09 6 min read Guide

Will the posts hold in our clay (or sandy) soil?

Only if they are set properly, and that is where cheap fences fail first. Why footing depth changes with the soil and the fence height, what a knocked-in post does in reactive clay, and why the posts and footings are the part we warrant.

A lot of the Coast sits on reactive clay. It is the main reason a fence leans a year after it goes in. The fix is not a secret. It is the footing, and it is the part most cheap quotes cut.

The short answer

Clay soil moves. It swells when it is wet and shrinks when it is dry. That movement pushes on anything set shallow. A post will hold in clay when the footing is deep enough, wide enough, and set in concrete. Get the footing right and the fence stays straight for decades.

What we do in clay

You cannot see a footing once the job is done. That is exactly why it is the first thing a cheap quote shrinks. We name the depth on the quote, so there is nothing hidden.

Where Postline makes it easy

We fence on reactive clay every week. We read the ground on the measure and size the footings for it. The depth and the post spacing go on the quote in plain numbers, so you can compare us to the next quote on the part that actually holds the fence up.

Ask this, exactly

“What footing depth and post spacing will you use for my soil, and will you put those numbers on the quote?”

A quote that names the footing depth is one you can trust in clay. A quote that stays silent on it is where the next lean starts.

One more thing

If you have seen movement before, cracked paths, sticking doors, a fence that already leans, tell us on the measure. It tells us how reactive the ground is, so we can size the footings to suit.

Common questions

Will fence posts hold in clay soil?
Yes, if the footings are built for the soil. Reactive clay swells and shrinks with water, which can push a poorly set post. We set posts deeper, in concrete footings sized for the ground, so the fence stays straight. The footing is the part you never see and the part that matters most.
How deep do fence posts go?
It depends on the height, the wind, and the soil. A common range is 450mm to 600mm for a standard home fence, and deeper for tall or exposed runs. In reactive clay we go deeper and wider. We name the footing on the quote.
Why do some fences lean after a year?
Almost always the footings. Posts set too shallow, or set in dirt instead of concrete, move with the clay. A fence is only as good as what holds it up. We do not save money below the ground, where you cannot see it.
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