Accessories / JD-AC-035
Post Mix Concrete 20kg
A 20kg bag of pre-blended post mix concrete for setting retaining wall and fence posts. Pour it dry into the hole around the post and add water. It gives you a little more time than rapid set to line up and plumb each post.
Usually delivered in 2–5 business days. We confirm the date with you before you pay.
Freight is priced to your delivery suburb for most metro areas, or will be confirmed with you before payment.
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01 / Product overview
Easy Mix Post Mix Concrete is a ready-to-use premixed concrete for quick, non-structural jobs around the home and site. Each bag combines accurately weighed Portland cement, graded aggregates and quality admixtures, so you get a consistent post mix every time with no measuring required.
This post mix concrete is ideal for:
- Fence posts
- Clothes lines
- Letterbox posts
- Garden lights
- Swing sets and play equipment
Use it where strength and stability matter more than surface finish. For structural work or exposed decorative finishes, choose a general-purpose or high-strength concrete mix instead.
Coverage Rates
- Each 20kg bag contains approximately 10 litres of concrete
- 1 bag (20kg) = 0.01 cubic metre
- 100 bags (20kg) = 1 cubic metre
Note: Use approximately two 20kg bags per post hole
Post mix or rapid set: post mix gives more time to adjust posts. Rapid set suits jobs where you need to keep moving.
Check your wall design
In Queensland, walls over 1m high, or walls supporting a load such as a driveway or building, generally need an engineer's design and council approval. Confirm sleeper and post sizes against your design before ordering.
02 / Detailed specifications
Know exactly what you’re ordering.
- Product code
- JD-AC-035
- Application
- Post piers for retaining wall and fence posts
- Material
- Pre-blended post mix concrete, 20kg bag
- Sales unit
- bag
- Weight
- 20.0 kg
- Delivery class
- Parcel or small-item service
03 / Shipping
Small items.
Simple delivery.
For very small items we use Australia Post. For all other items that cannot be sent by Australia Post, we will send via a courier service.
Lead time
Usually delivered in 2–5 business days. Express delivery in 3 business days may be available on request. We confirm the date with you before you pay.
Delivery area
We deliver this product to Brisbane, Ipswich, Logan, Redlands, Gold Coast, Sunshine Coast, Toowoomba and Gympie. Outside these areas, freight is confirmed with you before payment.
Vehicle access
Allow a safe approach, turning space and a clear, level unloading point. Tell us about narrow gates, steep driveways or overhead obstructions.
Unloading & handling
Confirm who will unload and whether equipment is needed. A forklift, crane or tail-lift is not automatically included.
Freight & timing
Freight is separate from the product price. We confirm the freight charge and delivery window on your quote, before you pay.
04 / Product FAQs
Before you order.
What is post mix concrete used for?
Easy Mix Post Mix Concrete is a premixed concrete for quick, non-structural jobs such as fence posts, clothes lines, letterbox posts, garden lights and play equipment. Pour it dry into the hole and add water. For structural work or exposed decorative finishes, choose a general-purpose or high-strength concrete mix instead.
How much post mix concrete do I need per post hole?
Use approximately two 20kg bags of post mix concrete per post hole. Each bag contains about 10 litres of concrete.
How many bags of post mix concrete make a cubic metre?
100 bags of 20kg post mix concrete make 1 cubic metre. One bag is 0.01 cubic metre.
Is post mix concrete or rapid set better for retaining wall posts?
Post mix gives you more time to adjust and plumb each post. Rapid set suits jobs where you need to keep moving.
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