Landscaping & Forestry Supplies
All Stocked Up For Spring
Delivered Across the UK
Multi Buy Discount:
Build It Postcrete Post Mix Concrete 20kg is a high-performance rapid-setting post mix concrete designed for fast, reliable installation of fence posts, gate posts, washing line poles, sign posts and a wide range of outdoor structures. Factory blended for consistent performance, this ready-mixed post fixing concrete removes the need to manually mix traditional concrete, helping save time, effort and labour on both domestic and professional projects.
Ideal for DIY, trade, landscaping, fencing, agricultural and commercial applications, Build It Postcrete provides a simple way to create a strong and durable foundation. Simply position the post securely in the prepared hole, pour the dry post mix around the post, add the recommended amount of water and allow the concrete to set. Its rapid-setting formulation achieves an initial set in approximately 5–10 minutes, depending on weather and site conditions, allowing posts to be installed quickly and efficiently.
Once fully cured, Build It Postcrete achieves a compressive strength of greater than 20N/mm² after 28 days, providing a dependable foundation for posts and outdoor structures. Suitable for timber, concrete, steel and plastic posts, this versatile post mix concrete is supplied in a waterproof 20kg plastic bag for convenient handling and storage.
*Initial setting time can vary depending on temperature, weather conditions, water quantity and site conditions.
Build It Postcrete is ideal for fixing and installing:
Build It Postcrete 20kg is suitable for a wide range of users, including:
Whether you're installing a single garden fence post or completing a larger fencing project, the rapid-setting formulation provides a convenient alternative to conventional site-mixed concrete.
Always follow the manufacturer's recommended installation instructions and ensure the hole dimensions are appropriate for the post and intended application.
Coverage depends on the diameter or dimensions of the post and the size and depth of the installation hole. The following guide provides approximate quantities.
| Hole Size | Approx. Bags Required |
|---|---|
| 150 × 300mm | 0.5 |
| 150 × 450mm | 0.5 |
| 150 × 600mm | 0.75 |
| 200 × 300mm | 0.75 |
| 200 × 450mm | 1 |
| 200 × 600mm | 1.5 |
| Hole Size | Approx. Bags Required |
|---|---|
| 200 × 450mm | 0.75 |
| 200 × 600mm | 1 |
| 200 × 750mm | 1.25 |
| 300 × 450mm | 2.25 |
| 300 × 600mm | 3 |
| 300 × 750mm | 3.75 |
| Hole Size | Approx. Bags Required |
|---|---|
| 200 × 450mm | 0.75 |
| 200 × 600mm | 0.75 |
| 200 × 750mm | 1 |
| 300 × 450mm | 2 |
| 300 × 600mm | 2.75 |
| 300 × 750mm | 3.5 |
Coverage figures are approximate and may vary according to post dimensions, hole size, ground conditions and installation method.
| Specification | Details |
|---|---|
| Product | Build It Postcrete Post Mix Concrete |
| Product Type | Rapid-setting post mix concrete |
| Weight | 20kg |
| Colour | Grey |
| Application | Post fixing |
| Mixing Required | No |
| Water Required | Yes |
| Initial Set Time | Approximately 5–10 minutes* |
| Compressive Strength | Greater than 20N/mm² after 28 days |
| Suitable Posts | Timber, steel, concrete and plastic |
| Usage | Internal & external, primarily external |
| Packaging | Waterproof plastic bag |
| Storage | Cool, dry location |
| Suitable For | Fencing, gates, landscaping, agriculture, signage and outdoor structures |
*Setting time is approximate and may vary according to temperature, weather, water quantity and site conditions.
