As the fencing season approaches, precise planning and accurate post placement are essential to ensure a strong, long-lasting fence. One of the most crucial elements often overlooked by DIYers and tradespeople alike is Postcrete – a ready-mix concrete solution that simplifies setting fence posts with professional results.
But what exactly is Postcrete, and how can it make your fencing project easier and more reliable?
What is Postcrete?
Postcrete is a ready-to-use blend of high-quality sand, cement, and additives, formulated specifically for fixing wooden, metal, and concrete posts. Unlike traditional concrete, Postcrete sets rapidly, making it ideal for DIY projects and professionals alike. Its ease of use ensures posts are secure and stable, even for first-time concrete users.
Step-by-Step Guide to Using Postcrete
1. Digging the Hole
Begin by digging a hole appropriate to your post size. The depth and width will vary depending on the intended strength and wind exposure.
2. Preparing the Hole
Fill the hole with water to approximately one-third of its depth. This ensures optimal mixing and curing when the Postcrete powder is added.
3. Adding Postcrete
Pour Postcrete evenly around the post until the powder fully covers the water surface. Lightly sprinkle additional water on top to initiate the setting process.
4. Positioning the Post
Adjust and level the post as required. The setting process begins within 5–10 minutes, so careful placement is crucial.
5. Finishing
Once the Postcrete has set, cover the top of the hole with soil, grass, or other finishing materials.
Tips & Tricks
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Temporary Bracing: Use scrap timber to create braces that hold posts level while pouring.
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Get a Helper: A second person with a spirit level ensures posts remain plumb.
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Wear PPE: Even though water reduces dust, protect your eyes and lungs from fine concrete particles.
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Mix and Adjust: A small stick or piece of scrap can help manipulate the Postcrete for even coverage.
Recommended Hole Sizes & Postcrete Quantities
| Hole Width | Hole Depth | Duty | Number of Postcrete Bags |
|---|---|---|---|
| 150mm (6") | 600mm (24") | Very Light | ½ Bag |
| 200mm (8") | 600mm (24") | Light | 1 Bag |
| 250mm (10") | 600mm (24") | Medium | 2 Bags |
| 300mm (12") | 600mm (24") | Heavy | 3 Bags |
Duty Class Explanation:
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Very Light Duty – Suitable for small decorative fences, trellis panels, or picket fencing. Not recommended for full-size fences in exposed areas.
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Light Duty – Appropriate for sheltered locations with minimal wind load. Ideal for lightweight cladding or panels.
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Medium Duty – Suitable for standard fences exposed to occasional wind. Can handle heavier panels.
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Heavy Duty – Recommended for coastal areas or exposed sites prone to strong winds.
Notes on Hole Sizes
The table provides general guidelines. The postcrete acts both as a counterweight and anchor, so focus on the number of bags required rather than exact hole dimensions. For rocky or uneven ground, slight adjustments may be necessary.
Calculating Volume
Each bag of Postcrete contains approximately 20 litres of concrete. To estimate required bags for custom-sized holes:
Volume = π × radius² × height
For high-precision projects, online cylinder calculators can be helpful. Otherwise, it’s safer to slightly overestimate the amount of Postcrete needed.
Final Advice
Postcrete simplifies fence installation, reduces errors, and ensures long-term stability. For any questions about quantities, hole sizes, or best practices, our sales team is available at 01656 745959 to provide expert guidance.