Postcrete FAQs
What is Postcrete?
Postcrete is a pre-mixed, quick-setting concrete specifically designed for securing fence posts, gate posts, and other upright supports in the ground. It contains a blend of cement, sand, and aggregates that allow it to set rapidly, usually within 5 to 10 minutes. Unlike traditional concrete mixes, Postcrete requires no mixing before use—simply pour it into a post hole and add water. The quick-setting nature of Postcrete makes it ideal for projects that require a fast and strong fixing solution. It is commonly used for timber and concrete fence posts, pergolas, decking supports, and signposts. Postcrete offers excellent durability and weather resistance, ensuring long-lasting support for outdoor structures.
How do you use Postcrete?
Using Postcrete is simple and efficient. Start by digging a hole for the post, typically at least one-third of the post’s height in depth. Position the post securely in the hole, ensuring it is level and upright. Pour Postcrete directly into the hole around the post, filling it to the required level. Add the recommended amount of water, usually around 2 to 3 litres per bag, pouring it evenly over the dry mix. The Postcrete will start to set within a few minutes, so there is no need to mix it beforehand. Hold the post steady while the Postcrete hardens. It is important to allow at least 10-15 minutes for initial setting and a few hours before applying heavy loads. Full curing typically takes 24 hours. Proper installation ensures a strong and long-lasting foundation for fencing, pergolas, and other structures.
How long does Postcrete take to set?
Postcrete is known for its fast-setting properties, usually hardening within 5 to 10 minutes after adding water. However, this initial set time does not mean the concrete has reached full strength. While the post will become firm quickly, it is advisable to wait at least 24 hours before applying significant weight or strain. The curing process continues over the following days, with maximum strength being achieved after several days. Weather conditions can affect the setting time, with colder temperatures slightly delaying the process. Ensuring proper post positioning and stability before pouring Postcrete is crucial, as adjustments become difficult once it starts to harden.
How much Postcrete do I need per post?
The amount of Postcrete required depends on the size of the post and the depth of the hole. As a general guideline, a standard 20kg bag of Postcrete is sufficient for a single post in a hole approximately 300mm (12 inches) wide and 600mm (24 inches) deep. For larger posts or deeper holes, additional bags may be needed. To calculate the exact amount, measure the hole dimensions and refer to the manufacturer’s recommendations. It is always a good idea to have extra Postcrete on hand to ensure a secure installation. Overfilling or underfilling the hole can affect the stability of the post.
Is Postcrete suitable for all types of posts?
Postcrete is designed for use with most types of fence posts, including timber and concrete. It provides a strong and durable foundation, ensuring stability over time. However, for particularly heavy structures, alternative concrete mixes may be recommended to provide additional strength. When using Postcrete with metal posts, ensure the post is coated to prevent corrosion. While Postcrete is suitable for standard applications such as fencing, decking supports, and pergolas, always check specific project requirements to determine whether a traditional concrete mix would be more appropriate.
