Replacing post in existing base

[Blagard]

Hi,

Has anyone successfuuly replaced a rotten post by removing the rotten bit from the concrete base and driving in a new post?

I am aware of other methods but just wondered if anyone has ever tried what I am asking.

Posts in question are 75mm square and I have reason to believe the section in the ground is relatively short, say around 300mm. The concrete is probably much deeped but the posts were set high to take a trellis on the top of the fence panel.

 

[JohnD]

yes but I was surprised it worked

after one rotted off I started drying to drill out the stump like an old tooth. To my surprise, after a while the stump seemed to vibrate and I was able to pull it out on the (big) drill. My guess is that the heat had dried it out a bit and made it contract.

I put a concrete spur down the hole as I never wanted to have a rotten post again.

 

[ladylola]

I've also done this method and yes it does work although it can be fiddly.
I've also done a similiar job , just this week as it happens, where I went to replace a couple of damaged panels and a post. Thee post had rotten off and I dug a small hole to the side of the concrete and then broke out one side of it leaving me with a "three sided " hole in the concrete which I was able to slot the new post in and then backfill with a bag of post mix .

 

[Blagard]

Thanks for the replies.

When I got down to the job I found that the existing post bases were really quite poor, so ended up doing traditional concrete spurs. As ladylola, when I excavated, I also removed the rotten stumps leaving a three sided hole in the old base, except the top 200mm of the backside abutted a plastic drainage channel so in effect only two sides of the old post hole were sound. The old post void was simply filled with concrete when I put the spurs in. I was able to reuse the old posts.