Sub-base. What is it? Who needs it? Well, if you’re installing artificial grass, you do, my friend.
Sub-base goes where your natural grass was once you’ve excavated down a few inches and before you install the grass. Its primary job is to prevent the natural expansion and contraction of your yard’s native soil from affecting the turf, thus preventing wrinkles from popping up.
In most professional installations, it’s one of three things:
- crushed miscellaneous base – CMB,
- class II road base, or
- decomposed granite.
Decomposed granite is considered the best of the three due to its superior drainage and ability to render a consistently flat surface. Certain types of installations, like putting greens, need decomposed granite sub-base more in order to perform and last. The problem with decomposed granite is it’s expensive.
