Blue Circle® Post Hole Concrete Mix is an Australian Made, ready‑to‑use concrete mix designed specifically for setting posts quickly and securely.
It is supplied as a pre‑mixed blend of cement, graded sand and aggregate, making it suitable for fencing, letterboxes, clothes hoists and general post‑setting applications where consistency and ease of use are important.
Features and Benefits
Australian Made post‑setting concrete
An Australian Made product designed for reliable performance under Australian site conditions.
Ready‑to‑use premixed concrete
Pre‑blended concrete mix that only requires the addition of water, reducing on‑site batching and guesswork.
Designed for post holes
Formulated for post‑setting applications where stability and ease of placement are required.
To confirm availability or discuss suitability for your application, contact Boral or your local stockist.
Applications
Blue Circle® Post Hole Concrete Mix is commonly used for:
- Fence posts
- Letterboxes
- Clothes hoists
- Garden structures and supports
- Small sign posts and fixtures
It is ideal for DIY and trade post‑setting jobs where a general purpose post hole concrete mix is suitable.
Range
- 20kg bags
Product Downloads
How deep should a post hole be?
As a general guide, post holes are typically dug to a depth of around one‑third of the total post length, depending on the application, soil conditions and load.
Always assess ground conditions and project requirements before installation.
How much concrete do I need for a post hole?
The table below provides indicative guidance only to help estimate material requirements. Actual quantities may vary depending on hole size, soil conditions and installation method.
| Post size (approx.) | Hole diameter | Hole depth | Approx. number of 20 kg bags |
| 75 × 75 mm post | 250 mm | 600 mm | 2–3 bags |
| 90 × 90 mm post | 300 mm | 600 mm | 3–4 bags |
| 100 × 100 mm post | 300 mm | 700 mm | 4–5 bags |
For larger posts, poor soil conditions or load‑bearing structures, additional concrete may be required.
Mixing and placement guidance
- Place the post in position and brace if required
- Pour the concrete mix into the hole according to instructions
- Add water as directed and ensure the mix is fully wetted
- Check alignment and allow the concrete to set before removing supports
Always follow the product data sheet for detailed instructions.
Important use considerations
- Not suitable for structural concrete applications such as slabs
- Water content is important — do not over‑water
- Ensure posts are properly supported until the concrete has set
- Follow safety and handling instructions on the bag and data sheet
Part of Boral’s packaged dry mixes range
Post Hole Concrete Mix forms part of Boral’s range of Australian Made packaged dry mix cement products, designed for fencing, post‑setting and general outdoor projects.
