GRASSY PAVERS™ Installation Guide
The Layered System
GRASSY PAVERS™ work as part of a complete layered system. Each layer plays a specific role in distributing load and managing water. From bottom to top:
- Native Subsoil — the foundation. Grade and compact the native soil to create a stable, level base.
- Geotextile Fabric — placed over the subsoil to prevent sub-base migration while allowing free water passage.
- Compacted Gravel Base — the primary structural layer. Depth varies by load requirement (see below).
- Sand or Fine Gravel Leveling Layer — 1–2 inches of washed sand or fine gravel for a smooth, level installation surface.
- GRASSY PAVERS™ Panels — interlocking recycled HDPE panels laid across the prepared surface.
- Cell Infill — grass seed/topsoil or aggregate, filled into the open cells of each panel.
💡 Tip: Proper sub-base preparation is the most important step. A well-prepared sub-base ensures long-term performance, load capacity, and drainage.
4-Step Installation Process
Prepare the Sub-Base
Excavate the area to the required depth for your application. Remove organic material, roots, and debris. Grade and compact the native soil to create a flat, stable surface. Install a geotextile fabric barrier, then add and compact the crushed stone base layer to the appropriate depth. Finish with a 1–2 inch leveling layer of washed concrete sand or fine angular gravel, screeded smooth.
Lay the Panels
Begin placing GRASSY PAVERS™ panels at one corner of the installation area. Panels interlock securely on all four sides — simply press them together until the connectors click into place. Work row by row across the surface. Panels can be easily cut with a hand saw, circular saw, or utility knife to fit edges, curves, and irregular shapes — no special tools needed.
Fill the Cells
Once panels are laid, fill the open hexagonal cells with your chosen infill material. For a grass surface: fill cells with quality topsoil to just below the top edge, then broadcast grass seed and lightly water. For an aggregate surface: fill cells with clean washed gravel or decomposed granite, screeded flush with the top of the panel.
Ready to Use
Aggregate-filled installations are immediately ready for vehicle and foot traffic. Grass-filled installations should be kept lightly moist until germination occurs (typically 2–4 weeks depending on species and climate). Once established, the grass grows up through the open cells to create a fully permeable green surface that looks and feels like natural turf.
Sub-Base Requirements by Load Type
The depth and composition of the gravel sub-base is the primary variable in a GRASSY PAVERS™ installation. Select the appropriate specification for your project's intended use:
🚶 Light Load Applications
Pedestrian paths, ADA trails, golf cart paths, bicycle routes
- Excavation depth: 6–8 inches total
- Geotextile fabric: 4 oz non-woven recommended
- Compacted crushed stone base: 4–6 inches of ¾" clean crushed limestone or gravel, compacted to 95%
- Sand leveling layer: 1 inch of washed concrete sand
- GRASSY PAVERS™ panel: 1-3/4 inch depth
For pedestrian and golf cart applications, a well-compacted native soil with good drainage may substitute for a full gravel base in some soil conditions. Consult our Specifications page for soil assessment guidelines.
🚛 Heavy Load Applications
Vehicles, fire trucks, heavy equipment, commercial parking
- Excavation depth: 10–18 inches total
- Geotextile fabric: 6 oz non-woven recommended
- Compacted crushed stone base: 8–16 inches of ¾" crushed limestone or recycled concrete aggregate, compacted in 4-inch lifts
- Sand or fine gravel leveling layer: 1–2 inches
- GRASSY PAVERS™ panel: 1-3/4 inch depth
For fire lane and emergency vehicle applications, follow local fire marshal requirements for sub-base specifications. The GRASSY PAVERS™ panel itself supports 97,000+ lbs/sq ft — adequate sub-base depth ensures that capacity is fully realized.
Infill Options
GRASSY PAVERS™ cells can be filled with a variety of materials depending on the desired appearance, use case, and maintenance preference:
🌱 Grass Seed
The most popular option. Fill cells with quality topsoil to just below the panel top, broadcast a suitable grass seed for your climate, and water regularly until established. After germination (2–4 weeks), the grass grows through the open cells to create a natural green surface. Choose a grass species appropriate for your sun exposure and climate zone.
🟩 Sod
For an instant green result, sod pieces can be cut and pressed into the open cells. This approach gives immediate visual impact but requires careful fitting and more intensive watering during establishment. Sod works well for smaller installations where coverage speed is a priority.
⬜ Gravel / Aggregate
Clean washed gravel, pea gravel, or decomposed granite provides an all-weather, low-maintenance surface that is immediately ready for traffic. Aggregate-filled GRASSY PAVERS™ are popular for fire lanes, parking lots, and areas with high traffic or shade where grass is difficult to establish. Water still percolates freely through the aggregate infill.
Maintenance Tips
Grass-Filled Installations
- Mow at a slightly higher height than adjacent turf to avoid scalping the panel tops
- Fertilize and water on a normal turf maintenance schedule
- If bare spots appear, spot-seed in the early spring or fall
- Avoid herbicides with soil sterilants — use selective broadleaf herbicides only
- In cold climates, the HDPE panels are unaffected by freeze-thaw cycles; grass may go dormant and recover naturally in spring
Aggregate-Filled Installations
- Top-dress cells annually if aggregate settles below the panel surface
- Blow or rake away debris that collects on the surface
- Use a pressure washer to remove compacted dirt or organic buildup if needed
- Inspect edges and perimeter panels periodically for movement; re-lock any panels that have shifted
- HDPE panels do not rust, rot, or degrade — no panel replacement needed under normal conditions
💡 General: GRASSY PAVERS™ panels are made from 97% recycled HDPE — an extremely durable material that resists UV degradation, chemical exposure, and freeze-thaw cycling. Under normal conditions, the panels provide decades of service without replacement.