The turf is what people see. The base is what determines how it performs and how long it lasts. A properly prepared base is the single most important factor in a successful artificial turf installation, and it is the step that most DIY installers and inexperienced contractors underestimate.
Step 1: Excavation
Start by removing all existing vegetation, sod, and topsoil. You need to get down to subgrade, the native soil beneath the organic layers. For a standard residential installation, this means removing four to six inches of material. For pet areas, athletic applications, or areas with heavy expected use, excavate six to eight inches.
Remove roots thoroughly. Any root material left in the base will decompose and create soft spots or uneven settling after the turf is installed.
Step 2: Weed Barrier
After excavating, install a non-woven geotextile weed barrier over the native subgrade. This layer serves two purposes: it prevents weed growth from below and it separates the aggregate base from the native soil. Use a high-quality permeable fabric, not plastic sheeting. Plastic sheeting blocks drainage.
Step 3: Base Material
Fill the excavated area with crushed aggregate base. Class II road base, which is a blend of crushed stone and fine material, is the standard for most applications. It compacts well, provides good drainage through the particle gaps, and creates a stable surface that does not shift under load.
Fill in two-inch lifts and compact each layer before adding the next. Final compaction should bring the base surface to within about half an inch below finished grade to allow for the turf backing and infill depth.
Step 4: Fine Grading
Before installing turf, the base surface needs to be smooth and properly graded. Any ridges, low spots, or unevenness in the base will telegraph through the turf and be visible on the finished surface. Use a screed or float to achieve a smooth, level surface with a slight grade for drainage.
Check grade carefully. Water needs somewhere to go. A one percent minimum slope toward a drainage outlet prevents pooling.
Step 5: Final Compaction Check
Walk the entire base area and check for soft spots. Any area that gives underfoot needs additional compaction. A properly prepared base feels firm and solid, not spongy. This firmness is what gives the finished turf surface its stable, professional feel.
For help selecting base materials or planning your installation, stop by Summit Turf Supply in Fort Collins.
Ready to take the next step? Explore step-by-step installation resources or contact Summit Turf Supply to get a quote for your project.