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How to set a post

Image of post completed with concrete added to the bottom 

Overview

Knowing how to set a post in your backyard is a handy skill. Posts can be used for installing letterboxes, building decks and even attaching screens. With a little forward planning, a few simple tools and some practice, you’ll soon be ready to transform your backyard with a whole range of D.I.Y. projects based around the humble post.

Safety tip: Always wear the appropriate safety equipment (safety glasses, ear muffs, gloves and mask, for example) and always follow the instructions for the product or equipment.

Steps

  1. 1

    Dig a hole

    Your post needs somewhere to go, so the first step is to dig a hole. A general rule of thumb is that the depth of the post-hole should be one-third of the height of the pole above the ground. For example, if your post is 2400mm, it should be set at 1800mm above ground. In this case, the hole should be 600mm.

    A hole being dug for pot
  2. 2

    Paint the bottom of the post

    Timber is prone to rot, so it’s a good idea to protect the part of your post that’s going into the ground with a coat of bitumen paint. Lay down a drop sheet and, using a paintbrush, simply brush on the bitumen. Wait until it’s completely dry and then pop the post in your freshly dug hole.
    Paint being applied to timber
  3. 3

    Mix the concrete

    If you have a wheelbarrow, you can mix up the concrete in that. If not, a bucket will do.

    Before you mix anything, read the instructions on your bag of concrete powder to find out the correct ratios. Add the water first, then add the powder in the suggested ratio. Mix it well using a stick or shovel to a toothpaste consistency, with no dry powder spots.

    Concrete being mixed in wheelbarrow
  4. 4

    Pour the concrete

    With your post in the hole, pour the concrete in, filling it almost to the top.

    Concrete being poured into the hole
  5. 5

    Brace the post

    Before the concrete dries, you’ll need to ensure the post is straight. To do this, brace it with two pieces of timber. Attach one to one side with a clamp and another piece opposite that one. These will support the post while the concrete dries overnight. Before you finish, check the post is plumb by using a spirit level on all sides.

  6. 6

    Ready to install your post?

    Explore our range of concrete products.

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Health & Safety

Asbestos, lead-based paints and copper chromium arsenic (CCA) treated timber are health hazards you need to look out for when renovating older homes. These substances can easily be disturbed when renovating and exposure to them can cause a range of life-threatening diseases and conditions including cancer. For information on the dangers of asbestos, lead-based paint and CCA treated timber and tips for dealing with these materials contact your local council's Environmental Health Officer or visit our Health & Safety page.

When following our advice in our D.I.Y. videos, make sure you use all equipment, including PPE, safely by following the manufacturer’s instructions. Check that the equipment is suitable for the task and that PPE fits properly. If you are unsure, hire an expert to do the job or talk to a Bunnings Team Member.