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Spotting post rot before it takes the fence with it

Timber post rot is the leading cause of Ramsgate fence failure. How to spot it before the post snaps in a winter storm, and whether to replace with timber or upgrade to concrete.

Most Ramsgate fences that fail in a winter blow fail at the posts, not the panels. Timber posts rot at ground level, quietly, for two or three years before they snap. The panels are usually still fine. Catching the rot before the post fails saves you the panel damage that comes when the fence goes over, and it gives you the option to upgrade cleanly rather than repair in a hurry.

Where to look

Timber post rot always starts at ground level. It's the water sitting in the topsoil, plus the fungal activity in the top few centimetres of soil, plus (in Ramsgate) a bit of salt. The post itself might be treated tanalised softwood, but the treatment is compromised where the post was cut to length on-site and the end grain was left exposed to the ground. Everything above ground and everything below about 300mm depth is usually fine. It's the 300mm strip right around the soil line that goes.

The three signs

Sign one: visible soft or spongy timber at the base. Press the surface with a screwdriver. If it goes in easily and comes out with wet wood on the tip, rot. Sign two: the post has a slight lean it didn't have last year. Not a catastrophic lean - just 3 or 4 degrees off vertical. That means the base is soft enough that the wind is starting to move the post in the ground. Sign three: visible cracks running vertically at the base, especially cracks that are wider at the ground line and narrow above it. Water is getting into the crack and freezing in winter, which widens it.

What happens if you leave it

The next big winter blow - a proper 40 to 50mph coastal gust - will snap the post at ground level. The post above ground breaks off cleanly. The panels on either side lift out of the (now-missing) post slot and either fall over or get caught by their fixings on the other post and swing. If a panel falls into a neighbour's garden, that's an awkward conversation. If it falls into the road (front-boundary posts), that's a Thanet DC conversation you don't want.

The two fixes

Like-for-like timber replacement: £70 to £120 per post. The new post is a fresh tanalised timber post concreted in. On average Ramsgate ground, expect 10 to 15 years before the same rot pattern shows up again. Right answer if only one or two posts have failed on an otherwise young fence. Concrete post upgrade: £45 to £70 per post fitted, reusing the existing panels. Concrete doesn't rot. Right answer if multiple posts on the same run are showing rot, if the fence is 10+ years old and end-of-life is on the horizon, or if it's a clifftop/West Cliff plot where the wind loading is going to take timber posts out again fast.

Timing

Do the walk-round in October or November before the winter storms. If you find rot, book the repair for November or December so it's fixed before January - that's when Ramsgate takes the worst of the winter weather from the North Sea.