Base material is the prepared aggregate layer placed between the subgrade and artificial turf in many landscape installations. It creates a stable, shaped, compacted, and generally permeable platform for the surface system.
Class II road base usually refers to a graded aggregate base meeting a particular public-agency or local specification. The exact term is regional; a supplier or installer should identify the governing specification rather than relying on the label alone.
Decomposed granite is weathered granite broken into small particles and fines. Some regional turf installers use specified products as part of a compacted base, but the name alone does not establish gradation, stability, or drainage performance.
A turf seam is the joint where two artificial-grass pieces meet. Seams are commonly secured with compatible tape and adhesive or another specified system, then aligned so spacing, pile direction, and appearance remain consistent.
Weed barrier is a fabric or membrane used in some artificial-grass assemblies to reduce plant growth or separate materials. Placement and permeability matter, and it does not guarantee a weed-free installation.