Wooden Gates For Bucks, Berks, Herts & Oxon
Lock your garden fence posts into position in record time with the UK’s industry-standard Blue Circle Postcrete (20kg). Manufactured by Tarmac, this premium, rapid-setting formulation eliminates the hard work of traditional concrete preparation. There is absolutely no mechanical mixing, shovel-turning, or wheelbarrow mess required. Simply fill your post hole with water, pour the dry Postcrete mix straight from the bag, and watch it chemically reactive-harden in just 5 to 10 minutes. It forms a high-density, storm-resistant concrete plug around timber, metal, or concrete posts, letting you complete entire fencing runs in a single afternoon.
Lightning-Fast 5–10 Minute Set: Quickly anchors vertical supports, saving you hours of manual bracing, propping, or holding posts plumb.
No Pre-Mixing Required: The specialized dry aggregate blend is designed to be emptied directly into standing water for immediate activation.
Weatherproof Plastic Packaging: Packed in a unique, highly durable, and waste-saving waterproof bag that allows for reliable outdoor storage on-site.
Multi-Material Ground Bonding: Creates an unyielding structural anchor around pressure-treated wood, galvanized steel spikes, and precast concrete posts alike.
Collection / Delivery allow 3-5 days
£7.30 + VAT
Standard master-mix concrete options can take anywhere from 24 to 48 hours to reach a safe load-bearing capacity. Leaving a fresh line of fence bays unsupported for that long leaves your boundary highly vulnerable to shifting out of plumb from strong overnight winds or moving subsoil. Blue Circle Postcrete completely rewires your fencing workflow by providing an almost instant structural foundation block.
By combining high-specification Portland cement, targeted chemical setting accelerators, and precision-graded sharp sands, this trade-grade mix rapidly triggers an exothermic hydration reaction. It seals tightly against the subterranean faces of your posts, creating a stable, low-porosity concrete sleeve that protects your posts against ground lateral forces and harsh winter frost cycles.
Maximum Efficiency On-Site: Greatly accelerates trade or domestic landscaping timelines—by the time you dig your next hole, your previous post is already locked firm.
Excellent Dynamic Penetration: The dry powder filters evenly down through the water column, preventing weak, dry pockets or hollow air bubbles at the base of the hole.
Sub-Surface Wood Defense: Forms a rigid concrete jacket that stabilizes timber, preventing localized subterranean wobbling that splits wood fibers.
Tough, Waste-Saving Bags: Designed to withstand rough trade handling and wet British weather, keeping the product fresh and active.
| Attribute | Specification |
| Brand | Blue Circle (Tarmac) |
| Product Type | Ready-to-Use Rapid-Setting Post Concrete |
| Bag Weight | 20kg |
| Initial Setting Time | 5 to 10 Minutes (Dependent on ambient ground temperature) |
| Full Curing Windows | Safe to fix panels after 20–30 mins; full cure in 24 hours |
| Material Base | Portland Cement, Specially Graded Aggregates, and Chemical Accelerators |
| Hole Yield Capacity | Typically 1 bag per standard 300mm x 300mm x 600mm hole |
Quantity Allocation Tip: For a standard 100mm x 100mm (4″ x 4″) timber post set into an industry-standard 300mm wide by 600mm deep hole, you will require exactly 1 bag of Blue Circle Postcrete. If you are hanging heavy, high-torque driveway gates, or working in exceptionally loose, sandy coastal soils, increase your hole diameter slightly and budget for 2 bags per post to build a wider structural footprint.
| Weight | 20 kg |
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| 5 star | 100% | |
| 4 star | 0% | |
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| 1 star | 0% |
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