Blue Circle Postcrete 20kg Ready-to-Use Post Fix

Blue Circle Postcrete 20kg Ready-to-Use Post Fix

By Blue Circle · Model: BC-POSTCRETE-20 · Building Materials

Just-add-water post fix that sets fence and gate posts in 10 minutes. No mixing required — pour around post and add water.

  • Sets in approximately 10 minutes
  • No mixing required — pour dry and add water
  • 20kg bag fixes 4-6 fence posts depending on hole size
  • Stronger than standard concrete for post setting
  • Works in all weather conditions including rain
  • Suitable for fence posts, gate posts, and sign posts
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Overview

Blue Circle Postcrete has become the default choice for setting fence posts across the UK, replacing traditional concrete mixing for the vast majority of domestic fencing jobs. The appeal is obvious — rather than mixing ballast, cement, and water in a wheelbarrow, you simply pour the dry powder around the post and add water. The post is solid and load-bearing within 10 minutes, allowing an entire fence run to be completed in a single day.

In-Depth Look

Blue Circle Postcrete has simplified one of the most common garden maintenance tasks in the UK. Setting fence posts used to involve bags of cement, ballast, a wheelbarrow, and a good deal of physical effort. Postcrete reduces the process to pouring a dry powder and adding water.

How It Works

The process is remarkably simple. Dig the post hole to the recommended depth (typically 600mm for a 1.8m fence post), position the post and check it is vertical, pour the dry Postcrete around the base to within 50mm of ground level, and then slowly add approximately 3 litres of water. The compound reacts with the water and begins to set almost immediately, reaching a firm, load-bearing state within 10 minutes. There is no mixing, no wheelbarrow, and no mess.

Practical Considerations

A 20kg bag will set between 4 and 6 posts depending on the diameter of the hole. For a standard fence run with posts at 1.8-metre centres, one bag comfortably handles a reasonable number of posts. The product works in wet conditions — in fact, rain during or shortly after application does not compromise the set. For very large gate posts or posts bearing significant weight, it is worth using additional product to ensure a solid footing.

Verdict

Blue Circle Postcrete is one of those products that makes you wonder how you ever managed without it. The cost premium over traditional concrete is easily justified by the time and effort saved, especially on domestic fencing projects where mixing concrete on-site is disproportionately laborious. For professional fencers and DIY homeowners alike, it has become an essential product.

Specifications
Weight20kg
Setting TimeApproximately 10 minutes
Posts Per Bag4-6 (depending on hole size)
TypeRapid-set post fix compound
MixingNo mixing — pour dry then add water
Suitable ForTimber, concrete, and metal posts
StorageStore in dry conditions

Who It's For

  • DIY homeowners replacing or installing garden fence panels and posts
  • Fencing contractors wanting faster post setting on domestic jobs
  • Anyone needing to set gate posts, washing line posts, or sign posts quickly

Pros & Cons

Pros

  • Dramatically faster than mixing and pouring traditional concrete
  • No wheelbarrow, mixer, or tools needed beyond a spade
  • Sets firm enough to hang fence panels within minutes
  • Reliable results even in wet weather conditions

Cons

  • Higher cost per post than bulk cement and ballast
  • 20kg bags are heavy and awkward to handle
  • Not suitable for structural foundations or large concrete pours
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