The quantity depends on the hole diameter, hole depth, post size and bag yield. Calculate the void around the post and compare it with the coverage on the bag, allowing for irregular ground and compaction.
Rapid Setting Mix for Fence and Gate Posts
Postcrete is a rapid-setting post-fixing mix for securing fence posts, gate posts and similar non-structural supports in the ground. It is placed using the method stated on the bag, commonly with water already in the prepared hole, so a conventional concrete mixer is not normally required. Keep the post braced and accurately positioned before the mix begins to firm.
Dig the hole to suit the post, ground conditions and expected loading, then remove loose soil and standing debris. The wider building materials range covers products for larger concrete and masonry tasks, where a fast post mix may not be the correct choice.
For projects using treated timber for external construction, protect any freshly cut ends as directed by the timber supplier. Timber and framing materials can also be selected alongside the post mix when building screens, rails or other garden structures.
Postcrete FAQ's
Many rapid post-setting products are designed to be added directly to a water-filled hole, but methods vary. Follow the instructions on the specific bag and do not assume it uses the same process as conventional concrete.
Brace the post until the mix has set sufficiently to hold it without movement. Initial setting can be rapid, but loading the post or attaching heavy gates should wait for the manufacturer’s stated curing time.
Post-setting concrete is formulated for fixing posts and should not be substituted for structural concrete unless its technical data explicitly permits that application. Use the mix and specification required by the structural design.
The hole conditions must suit the product instructions. Remove excessive standing water and loose material, and seek project-specific advice where drainage, frost, unstable soil or high loads may affect the foundation.