How to Prepare Base for Synthetic Grass Turf?

How to Perfect Base Preparation to Avoid Wasted Effort

When you invest a significant budget in premium synthetic grass turf and hire professional installers, only to find depressions, water pooling, or large-scale deformation three months later—90% of such failures originate from one underestimated step: base preparation. If synthetic grass turf is the building’s “facade,” then the base is its “structural skeleton.” This article provides an in-depth engineering analysis of base preparation, offering an ultimate solution applicable to any ground condition.

Part 1: Why is the Base the “Invisible Soul”?

1.1 The Three Core Missions of the Base

(1) Load-Bearing and Distribution

– Dynamic loads: Impact forces from foot traffic (approx. 1.5 times body weight)

– Static loads: Continuous pressure from furniture or sports equipment

– Environmental loads: Mechanical effects from rainwater penetration and frost heave

– Data shows: Unprepared bases can settle 3-5cm within 6 months, causing visible undulations

(2) Creating a Drainage Lifeline

– Surface water must flow through: Turf permeable layer → Base filter layer → Subsurface drainage system

– Hazards of poor drainage:

  – Standing water breeds mosquitoes (larvae can develop within 48 hours)

  – Frost heave damage in winter

  – Base mold growth from prolonged dampness (in environments >70% humidity)

(3) Establishing a Stable Geometric Plane

– Flatness tolerance: ≤5mm gap under a 3m straightedge

– Slope deviation: ≤0.5% error over any 10㎡ area

– Micro-roughness: Maximum surface particle size ≤10mm

1.2 Four Typical Symptoms of Base Failure

Failure Type	Timeframe	Manifestation	Root Cause
Localized Settlement	2-6 months	“Crater-like” depressions	Insufficient compaction (<93% standard)
Drainage Failure	First rainfall	Regional ponding	Reverse slope or slope <0.3%
Edge Heaving	1-2 seasonal cycles	Edge lifting 3-10cm	No buffer space for thermal expansion
Microbial Damage	6-12 months	Mold spots, odors at base	Missing moisture barrier + poor ventilation