what is asub base
Sub-Base. Sub-base is the term we use to describe the area that lies directly underneath the artificial grass. It is most commonly made up of a sand/gravel mixture, although in some instances it consists of concrete, asphalt or even a wood base. common question is âWhy do I need to install a sub-base? Why canât I just install my artificial grass on top of dirt?â The answer is that native soil is expansive (particularly soil with clay in it) and when it gets wet, the soil expands; when it dries, the soil contracts.