Tools you will need:
- Spirit level
- Tape measure
- Post hole digger or long handled shovel
- Measuring jug
- Hose or bucket
- Rod for tamping
Read the installation instructions provided by the letterbox manufacturer and then follow these simple steps to use the recommended concrete product to install your new letterbox.
Tools you will need:
Materials you will need:
Although you can use any product from the Cement Australia concrete range, we recommend Rapid Set Concrete for ease & speed.
Before you begin any project, please ensure you protect yourself with the following:
Replacing an existing letterbox? Dig out the current letterbox post and dispose of correctly.
If you’re putting your letterbox in a new location, use a post hole digger or long handled shovel to dig your post hole adding 10cm depth to allow for gravel to be placed under the post for drainage. Aim for the letterbox opening to be between 900 mm and 1200 mm above the ground.
Refer to our simple Calculator to work out how much concrete product you will need.
Pre-soak the hole thoroughly with clean water and allow the water to drain into the soil.
Place 10cm of gravel in the hole for drainage. Position your letterbox post in the centre of the hole, ensuring that it is vertical using a spirit level. Ask your friend to hold the letterbox post steady in position.
Accurately measure 2.5 litres of clean water per 20kg bag and add the water to the hole. Immediately pour in half the bag of Rapid Set Concrete making sure that it is evenly distributed around the post.
Guide to setting a post using Rapid Set
Tamp the product around the post using a rod to remove any air pockets. Add the remaining half bag of product and tamp again. Add small amounts of water only if required to ensure that the mix is completely moistened. Should you need more concrete for the hole, immediately repeat the process with another bag.
Tamping is essential to remove air pockets and achieves a solidly set letterbox every time.
Heap the surface of the concrete to create a rounded crown around the letterbox post so any surface water flows away from the post. Cover the concrete surface with earth or a decorative gravel for a tidy finish.
Wait for 24 hours for the concrete to harden before attaching the letterbox to the post.