In order to get turf installed, does there need to be existing soil base?

In order to get turf installed, does there need to be existing soil base?

When replacing your real grass lawn with artificial grass, we recommend to excavate about 4” thick of soil and build a sub base: 2-1/2” of road base and 1-1/2” of decomposed granite. Such sub base will ensure proper drainage and smoothness for your turf installations. To learn more about artificial grass installation, please visit this link: https://megagrass.com/pages/installation, or email us at support@megagrass.com, thank you.