Artificial grass isn’t always used on traditional grass areas. People also use artificial turf on concrete patios, decks, and pool areas.
The sub-base is the area that’s underneath the artificial turf. For the best looking artificial grass, use a great sub-base. The existing soil in most grass areas expands and contrasts in hot and cold and wet and dry conditions. If you ignore the sub-base, you could end up with wrinkles and gaps or soft spots in your grass. This creates uneven surfaces.