Fixing Fence Posts - Concreting Fence Posts and Washing Line Posts Using Postcrete

Summary: How to use quick-setting no-mix concrete product Postcrete to fix fence posts into the hole when installing fencing. Step-by-step DIY guide and Video tutorial on using Postcrete to concrete in your fence posts and other posts, such as rotary washing lines. This makes fixing fence posts a much easier DIY job.

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This is a project on how to use the new Tarmac product called Postcrete which is a premixed concrete which is simply tipped in a hole full of water! It does not get easier than this.

The mix comes in very handy sized 20kg, waterproof bags and while it may be a little expensive for a long run of fencing it is absolutely ideal for a single fence post or the metal post for a washing line.

The video at the base of this page shows how Postcrete works and the information contained below is a step-by-step guide.

  1. Dig your hole to the correct depth relevant to the size of the post you are using. To make sure you have the right sized hole for your fence post take a look at the table in our digging fence post holes project. Also, if you are creating a run of several fence posts then it is a good idea to mark your posts out using a plumb line to ensure that they all run in a straight line and that the face of each post is level with the post next to it
  2. Hole with post inserted

    Hole dug and post inserted ready for concreting

  3. Once you have dug the hole to the correct depth, place the post in the hole using the plumb line as a guide to ensure that the face of the post touching the plumb line is flat against it and in line with the other posts if there are any. To ensure that the post remains upright you may need some help from a family member or a friend to hold the top of the post upright in the hole. If there is no one around to assist you, you can use 4 timber battens that you can position on each face of the post to hold it upright in the hole. With the post positioned roughly in the hole use a spirit level to fine tune and ensure that it is true
  4. Fill the hole with water to one/third of its depth (see visual instructions below or instructions on the reverse of the bag for more details)
  5. Hole with water added

    Filling hole with required amount of water ready for adding Postcrete

  6. Pour in the Postcrete evenly around the post until no water is visible. The mix should cover the water. Then sprinkle a little water on top of the mix. As mentioned above you may still require the assisatnce of a family member or friend or several battens if no one is around to assist you in the final positioning of the post to ensure that it is upright in a true position
  7. Adding postcrete to water

    Adding Postcrete to water in the hole

  8. Again as above, using a spirit level, make sure the post is upright and in the centre of the hole, adjusting if required. The mix will take 5 – 10 minutes to set hard enough to remove any supports. Periodically check the posts position using your spirit level to ensure that it remains upright
  9. Check the upright level of post

    Using a spirit level to check the upright level of the post

  10. Once you have ensured that the Postcrete mix has set hard cover the top of the mix with soil and grass if required

See the instructions below for using Tarmac Postcrete or if you would like more information on Postcrete and the other pre mixed and ready mixed concretes available from Tarmac visit the DIY Cement website

Postcrete setting in hole

Postcrete setting in hole around post

For a longer run of fencing or a lot of fence posts, click here for our concreting fence posts project

Don't fancy doing this project yourself? We work with Plentific to ensure that we recommend only reliable and trustworthy tradesmen.

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