Post Mix Bags 20kg are a convenient premixed concrete solution for setting posts quickly and consistently. Designed for simple non-structural concrete work, this ready-to-use mix is ideal for fence posts, clothes lines, garden lights, letterbox posts, small poles, and general landscaping applications where a strong post footing is required.
Each bag contains a carefully blended mix of Portland cement, graded aggregates, and admixtures. Simply add clean water as directed and use the mix around the post hole to create a stable footing. Post mix is a practical choice for fencing, garden, and retaining wall preparation jobs where bagged concrete is easier than mixing separate cement, sand, and aggregate on site.
Post mix is designed to make small concrete jobs faster and easier. Instead of separately measuring cement, sand, aggregate, and additives, the dry components are already blended in the bag. This helps improve consistency and reduces preparation time on site, especially for fencing, landscaping, and post-setting projects.
For post holes, the bagged mix is typically placed around the positioned post and combined with clean water according to the product directions. Once hydrated and compacted correctly, the mix forms a concrete footing that helps hold the post in place. The final strength and stability of the post still depend on correct hole depth, hole diameter, soil condition, post alignment, and curing conditions.
Post mix is a practical option for general post-setting work where convenience and consistency are the main priorities. Rapid set concrete is usually chosen when faster hardening time is required, such as jobs where posts need to be secured quickly and site downtime must be reduced.
For standard fence posts, letterboxes, garden lights, and general landscaping work, post mix is often suitable. For time-sensitive installations or jobs requiring quicker set times, rapid set concrete may be the better choice.
Post mix may be suitable for selected retaining wall post holes where the wall design, footing size, and site conditions allow it. For concrete sleeper retaining walls, footing requirements depend on wall height, post type, post spacing, soil type, drainage, surcharge loads, and engineering requirements.
As a practical guide, a standard post hole may require more than one bag. The source product information notes approximately two 20kg bags per post hole, but the actual quantity should always be calculated from the hole diameter and depth. Taller retaining walls, deeper holes, larger diameter footings, or uneven excavation may require additional bags.
For engineered retaining walls, walls over 1.0m, clay soils, driveways, fences above the wall, or walls close to structures, always follow the engineer’s nominated concrete strength, footing depth, hole diameter, post size, and installation method.
Before adding post mix, dig the hole to the correct depth and diameter for the post being installed. Position the post carefully, check alignment, and brace it if needed before placing the mix. Add clean water according to the product directions and keep the post stable while the concrete sets and cures.
Do not rely on post mix to compensate for poor footing design, shallow holes, weak soil, incorrect post spacing, or poor drainage. For retaining wall systems, the concrete footing works together with the steel post, sleepers, backfill, and drainage system to resist soil pressure.
Post Mix Bags 20kg are available for delivery across Sydney, Melbourne, Brisbane, Perth, Adelaide, Canberra, Gold Coast, and regional Australia. Get a free quote for your retaining wall, fencing, or landscaping materials.
