Synthetic turf for playgrounds delivers safety, durability, and a clean aesthetic—but only if what’s underneath is done right. The sub-base is the unsung hero of every successful installation. Skip best practices here, and you risk drainage issues, uneven surfaces, and even voided warranties. At The Surfacing Group, we know that a great play space starts below the turf.
Step One: Excavation and Planning
Before the first roll of turf arrives, the site needs proper excavation—typically 80–100 mm (about 4") deep. This ensures room for drainage layers and padding. Always check for utilities before digging and consider erosion control measures if required. Evaluate slope and runoff early; water management is critical for long-term performance.
The Sub-Base: Crushed Stone or Hard Surface?
There are two common approaches:
Compacted Stone Base
A homogeneous mix of ¾" stone down to fines, applied in layers and compacted to 95% Standard Proctor density. Depth should be 4"–6", with a 2% slope for drainage. Finish grade must not vary more than ¼" over 10 feet. For turf over foam pads, add a 1" finish stone layer graded within ¼" tolerance.
Concrete should be at least 4" thick, asphalt 2"–4". Both require a 1% slope and proper drainage at low points. Newly poured concrete must cure for at least 14 days (longer in cooler climates). Install weep holes in curbs or walls to allow water to escape.
Drainage: Non-Negotiable
Water will permeate through turf and padding, so the sub-base must move it away efficiently. Poor drainage leads to pooling, freeze-thaw damage, and surface instability. Whether using stone or concrete, plan for drains at low points and maintain slope integrity throughout the base.
Why It Matters
A well-prepared sub-base ensures:
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On-time installation (avoiding delays from rework)
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Warranty compliance (manufacturers require proper base prep)
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Long-term performance (stable, safe, and visually consistent)
Cut corners here, and the problems will show up fast—and cost more to fix later.
Final Thoughts
Synthetic turf is only as good as the foundation beneath it. Following best practices for excavation, compaction, slope, and drainage isn’t optional—it’s essential. At The Surfacing Group, we help clients plan and execute these steps so every playground project is safe, beautiful, and built to last.