Recycled Drainage Gravel (20mm)

Recycled Drainage Gravel (20mm) is a cost-effective option for diverting water and improving drainage, often in conjunction with other drainage systems. It is also a great way to reduce waterlogging by allowing the free flow of water through your outdoor space.

Recycled Drainage Gravel is commonly used for:

• Drainage behind retaining walls
• Agricultural drains
• French drains
• Trench drainage
• Soakwells and pits
• Pipe backfilling
• General landscaping drainage applications

The 20mm sizing is the size of choice for DIYers and smaller residential or commercial products.

Where drainage is concerned, recycled gravel is just as effective at water management a quarried stone. The difference between the two are in their appearance and product purity.

Recycled Drainage Gravel is manufactured from processed concrete recovered from demolition and construction projects. Because it is a recycled product, the colour and texture are typically less uniform than natural quarried gravel, and small traces of materials such as steel, timber, or other construction debris may occasionally be present.

To calculate how much Recycled Drainage Gravel (20mm) you need for your project, measure the length and width of the area where the gravel will be placed.

Next, determine the desired depth of the gravel. The required depth will vary depending on the project you are undertaking and the area you need to fill.

Once you have your length, width, and depth measurements, you can use our cubic metre calculator above or calculate the volume manually using the following formula:

Volume = Length × Width × Height

Note: We recommend adding at least 10% extra to your total calculated volume to allow for settling and levelling.

For the best drainage results, consider installing Bidum filter cloth (geofabric) together with AG pipe. The filter cloth helps separate the gravel from surrounding soil to reduce sediment build-up, while the AG pipe improves water collection and flow.