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Ah the problem I find with postcrete is the wooden post will eventually rot and break and then you have to dig this out although it makes doing the job easy as you can put the post with the Crete dry until everything is level,
Some folk put those metal post holders in the postcrete but I’ve never done this , good luck anyways -
If you can find a local stockist I would look into trying to get hold of some postsavers, should reduce the speed that your posts rot out.
A few of the local timber merchants round here stock them.
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The post saver tip is a good one. Don't use postcrete, it has the structural strength of wombat shit. Dry mix a 25kg bag of ballast with a heaped shovel of cement, one mix per hole. Whack it down hard around the post, about 2 shovels at a time, using a broom handle or similar, no water is needed as it will draw in ground moisture. A post level, available from Screwfix or most builders merchants for about £4 is helpful. Not all panels are created equal, so use an actual panel to position the next post.
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I would listen to whatever Colin says first as he does this shit for a living but in my more limited experience...
I would never use wooden fence posts. They rot very quickly. Yes you can treat and protect them but even if they last 15 years that comes around much faster than you think.
You then have the joy of digging out not only the remains of the fence post but the postcrete/concrete that was around the base (I had to do this in my garden).
Far more effective is to go for concrete fence posts that will last for a lifetime and not have to be redone.
I'm going to hopefully be putting up a fence at the end of our garden this weekend (assuming I can clear the area). I have 4 x 8', 4"x4" rounded top, pressure treated posts and 3x 6'x6' trellis topped panels to go between them. My plan is as follows, let me know if I am missing something;
Clear and level area
Treat bottom 3' of posts (but what with? is it even necessary if they are pressure treated?)
Dig first post hole as close to neighbours last fence post as possible (one neighbour has 6' high fence, planning to start from there and then overlap the other neighbour's 3' fence if necessary - I've check and this is OK).
Dig hole 2' deep (google tells me a post sticking up out of the ground 6' should be buried 2')
Stand the first post and use Postcrete to anchor (following instrucitons, and advice from a mate - that should be fill the hole around the post around 2/3 with water, dump in postcrete, secure post plum with scrapwood).
Measure off first post 6'2" to centre the next hole.
Rinse and repeat.