Home 5 Product 5 20 to 40mm Gravel

20 to 40mm Gravel

20-40mm is the largest gravel size we sell, typically used as a filter media.

Applications & Uses 

20-40mm gravel has a variety of uses, predominantly as a drainage medium for soakaways, French drains and field drainage. Our gravel meets the Series 500 Specification for Highway Works. This standard covers materials that are intended to be used for drainage or service ducts.


Specification for Highway WorksBritish Standards
Series 500BS EN 12620
BS EN 13242


Brewster Brothers are the first aggregates producer in the UK to achieve an Environmental Product Declaration (EPD) for recycled aggregates. This has been independently verified by BRE Group. The impact of our EPD on our customers and the main contractors in their supply chains is that you now have access to accurate and transparent environmental impact data for your sustainability reporting.

Using the results from the EPD, we can provide you with accurate carbon savings for using our recycled aggregates versus the average for both virgin and other recycled aggregates according to the UK Government’s indices. Use our brand new Carbon Calculator to find out about the carbon you could save using our products.  

Brewster Brothers EPD
20-40mm gravel

How do we separate and produce our 20-40mm gravel?

  1. Step One:
  2. Construction and demolition waste is fed into our recycling plant.
  3. Step Two:
  4. Anything that is larger than 100mm is removed and crushed into smaller pieces before being fed into the plant again.
  5. Step Three:
  6. A large magnet is used to remove any remaining pieces of metal.
  7. Step Four: 
  8. The aggregates and sand are then separated. The sand is diverted to the sand plant to be processed and the aggregate continues through to the aggregates processor.
  9. Step Five:
  10. In the aggregates processor, the materials receive a thorough wash from the log washer.
  11. Step Six:
  12. The aggregate is then passed through several sieves to separate it into the 3 different product types, 4-10mm, 10-20mm and 20-40mm gravel. The aggregates are finally delivered to their relevant stockpiles via conveyor belt.

Where does it come from?

20-40mm gravel can be found in the construction and demolition waste that we process at our recycling plant. Using a circular business model we are able to recover and regenerate waste, minimizing the impact it has on the environment. We maximise the value from the aggregates by regenerating them, keeping them in circulation for as long as possible. Virgin aggregates like sand are a finite resource but are core resources for building. Choosing recycled aggregates reduces the demand for energy intensive virgin aggregates which benefits the environment. The linear take, make, dispose model isn’t sustainable and is having a detrimental effect on the environment.