Description
Postmix 20kg is a ready-to-use rapid set post concrete designed for quick and secure installation of fence posts, gate posts and outdoor structures. Often referred to as postcrete, this product requires no mixing tray — simply add water directly into the post hole, position the post, and pour in the mix.
Under normal weather conditions, this rapid set concrete begins to set in approximately 10 minutes, allowing faster installation compared to traditional sand and cement mixes.
Suitable Applications
- Fence Posts – suitable for timber and concrete fence posts
- Gate Posts – provides a solid fixing for heavier installations when correctly installed
- Pergolas & Outdoor Structures – ideal for ground-set timber structures
- Landscaping Projects – suitable for general outdoor fixing applications
How To Use Postmix
1. Dig the post hole to the required depth.
2. Position the post and check alignment.
3. Pour approximately half a bucket of clean water into the hole.
4. Add the postmix evenly around the post.
5. Add additional water as required and allow to set.
Coverage Guidance
One 20kg bag is typically sufficient for one standard fence post hole (based on average depth and post size).
Larger posts, deeper holes (600mm+), or loose ground conditions may require additional bags.
For help calculating how many bags you need, see our guide: How Many Fence Posts & Bags of Postmix Do I Need?
Key Benefits
- Ready to use – just add water
- Rapid setting (approx. 10 minutes)
- Strong and durable once cured
- Suitable for most outdoor ground conditions
- Cleaner and faster than traditional concrete mixing
“Postcrete” is commonly used as a generic term for rapid set post concrete. Product supplied may be an equivalent rapid set postmix.
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