A sub-base (also subbase) is a layer of crushed rock or similar material located above the subgrade, but beneath the base course of a road pavement.


The sub-base is often the main load-bearing layer of the pavement. Its role is to spread the load evenly over the subgrade. The materials used may be either unbound granular, or cement-bound. The quality of subbase is very important for the useful life of the road.

Location Within Pavement


Related Pages

External Links & References

  1. Wikipedia
  2. Google Search
Unless otherwise stated, the content of this page is licensed under Creative Commons Attribution-ShareAlike 3.0 License