4 Tips for preparing for a concrete floor

04th December 2019

Before you receive your order of bespoke ready-mixed concrete from one of the South's leading suppliers, there are a number of thing you need to do to prepare in order to ensure your concrete flooring installation is as smooth and hassle free as possible.

Prepare the ground 

If it’s not poured over a solid base, concrete can crack and crumble, no matter the size of the area. So, in order to ensure the strongest, level concrete surface, you’ll need to prepare the ground first. This involves digging down to the required depth; for foundations or floor slabs, remember to allow enough depth for the subbase, damp-proof membrane and the concrete. Before you begin, ensure all stones, plants and other debris is cleared from the area. 

It’s also a good idea to assess the drainage needs of the area. If your concrete is going to be placed outdoors or in a high-moisture environment, consider adding drainage solutions like channels or weep holes to avoid water pooling underneath the slab, which can weaken its foundation over time.

Lay a subbase and damp-proof membrane 

Once you’ve excavated the site of the pour to the required depth, you’ll need to lay the subbase. It’s important to understand what your concrete will be used for, as the thicker the subbase the heavier the load the concrete will be able to support. Depending on the type of concrete pour, you may need to use specific subbase materials. Gravel and crushed stone are commonly used, but for heavier traffic areas, you might need to opt for a reinforced subbase with compacted stone or even a concrete foundation beneath the slab.

If appropriate, you’ll also need to install a damp-proof membrane (DPM) as this helps protect from rising damp and stops the fresh concrete from drying out too quickly. The DPM also keeps moisture from seeping up into the slab, which can cause issues such as efflorescence or damage to flooring materials over time.

Build a frame to keep the concrete in place 

Next, you’ll need to build a frame in to which you will pour the concrete, so it holds its shape while it sets. The frame is typically made from 25mm thick timber planks that are well supported so they don’t move or fall down while the concrete is poured. Remember, the frame will need to be as thick as the final concrete slab. 

It’s crucial to ensure the frame is both level and square before pouring. Use a spirit level and tape measure to verify that the frame is aligned correctly, as an uneven frame can lead to a misaligned or unlevel concrete slab. If necessary, use additional bracing to reinforce the frame, especially for larger pours.

Remember, the frame will need to be as thick as the final concrete slab, so make sure to measure carefully to achieve the desired slab thickness.

Prepare for the concrete delivery 

The final step is to ready your site for the delivery of the pre-mixed concrete. This not only ensures a smooth transition from pump truck to the pour site but also helps speed up the process, so you reduce the risk of the ready-mixed concrete beginning to cure too early. Preparing the site includes clearing paths for easy access, laying planks or other support on slopes or uneven ground and making sure you have all the manpower and tools you need.

Have the appropriate equipment on hand, such as wheelbarrows, shovels, and trowels, to help distribute the concrete evenly. Depending on the scale of your pour, you may also need extra hands to assist with smoothing, finishing, and levelling the concrete as it’s poured. This ensures the work is done quickly and efficiently without compromising the quality of the finish.

Lastly, take into account the weather forecast for your concrete pour. Extreme temperatures—either hot or cold—can have a significant impact on how the concrete sets. On very hot days, consider wetting the subbase or using retarders to slow down curing. On colder days, use heaters or blankets to keep the concrete warm and prevent freezing.

Wright Readymix is a leading supplier of ready-mixed concrete created to your projects’ specific requirements in the South. To learn more about preparing for a concrete pour or to arrange a delivery, please contact us today on 0117 958 2090. 

Previous Next