Question 1

1. How much Postcrete should I use per post?

Accepted Answer

The amount of Postcrete required per post depends on its size, weight, and ground conditions. As a general guideline, for typical fence posts or supports, 1 to 2 bags of 20kg Postcrete are usually sufficient. This provides enough material to fill the hole securely and ensure stable support. For larger or heavier posts, such as gate supports, timber beams, or concrete panels, you may need to use additional bags to fill the hole adequately and achieve the necessary support and stability. To get the best results, always check the manufacturer’s recommendations and measure your post length and ground conditions accurately. Properly filling the hole ensures maximum support, prevents shifting, and prolongs the lifespan of your fencing or structure.

Question 2

2. How long does Postcrete take to set?

Accepted Answer

Most fast setting post mixes, such as Blue Circle Postcrete, begin to harden within just 5 to 10 minutes of mixing and pouring. However, while they develop initial support quickly, it is essential to allow a few hours for the cement to cure properly and reach sufficient strength for supporting loads. For typical fencing and support posts, it’s recommended to wait at least 2–3 hours before attaching panels or applying any stress. Full curing and maximum support are generally achieved in around 24 hours, especially in favourable weather conditions. Always follow the manufacturer’s instructions for curing times to ensure your posts remain stable and secure for the long term.

Question 3

3. Postcrete vs concrete – what’s the difference?

Accepted Answer

Postcrete and standard concrete are both essential building materials, but they serve different purposes and have distinct characteristics. Postcrete consists of a pre-mixed blend of cement, sand, and additives specially formulated for rapid setting. It is designed for quick support in applications such as fencing, gate posts, and support supports, often reaching initial set within 5–10 minutes. However, it offers less overall strength and is limited to support functions rather than load-bearing structures.

In contrast, standard concrete takes much longer to cure—often 24 to 48 hours—before it reaches its full strength, which exceeds that of post mix. It is suitable for a wider range of structural applications, including foundations, slabs, and large-support bases, where maximum strength and durability are required. While concrete provides longer-lasting support, it demands more time for mixing, setting, and curing, making it less ideal for projects where speed of installation is a priority. Choosing between the two depends on your project requirements, with postcrete being ideal for quick, minor supports and concrete suited for major structural work.

Question 4

4. Can I use Postcrete for purposes other than fence posts?

Accepted Answer

Yes, Postcrete is a versatile rapid-set concrete mix suitable for a variety of applications beyond fencing. It can be used to set support posts for gates, garden signs, or supporting structures such as garden furniture or decorative features. It’s also ideal for small repairs where quick support is needed, such as stabilising cracked bricks or filling gaps in work where speed and stability are priorities. Its fast-curing property makes it a practical choice for any quick-build or repair job requiring reliable, instant support.

Postcrete and post mix

Blue Circle Postcrete Cement 20kg

Hanson Fast Set Postfix® 20kg

Hanson Postfix® Concrete 20kg

Carlton Rapid Set Fence Post Concrete 20kg