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Grass Block concrete pavers provide an alternative to runoff and heat-producing vehicle parking surfaces such as asphalt and poured concrete. Other applications include erosion-control along shorelines, stream banks, and embankments, as well as parking lots, driveways, emergency access routes, golf cart pathways, highway crossovers, and drainage ditches.
Advantages of Grass Blocks over concrete or asphalt paths include: beautiful, dust-free and mud-free parking for community parks, driveways, and access roads; runoff water drainage; breathable, oxygen-producing lawns that reduce high temperatures in cities; erosion and flood-control with water and aeration for tree roots; qualification as both landscaped and parking zones; acceptable surfaces for wheelchairs and bicycles.
- Unit Dimensions: 11.5"W x 3.5 "H x 17.25"L.
- Weight: 32 lbs.
- Units/Sq. Foot: 0.69 unit = 1 sq. ft.
- Compressive Strength: 5000 PSI
Preparation - For lightweight vehicular and pedestrian traffic, the sub-base material may consist of the existing firm subgrade. For heavy vehicular traffic, the sub-base should be 6" thick of 3/8" to 1-1/2" compacted aggregate. Spread and level a 1-1/2" layer of damp concrete sand over the subgrade.
Application - Place Grass Block units by hand, being careful not to disturb the leveled sand layer. Proceed outward from the previously laid units with a minimum of 1/16" joint spacing to avoid chipping and spall upon repetitive loading. Set each block with largest sized opening facing upwards.
Restrict edge movement with tampered earth, PVC plastic edging, timber edging, steel, concrete, or curb. If openings will be filled with crushed rock or cinder, vibrate units before filling using a plate vibrator. Use a rubber matt attachment or plywood placed upon the surface of the grass block to prevent the blocks from chipping. Note: rainfall will make it difficult to vibrate the units into place as it settles the exposed sand. Protect the blocks from moisture with plastic covering until you are ready to proceed.
For grass-filled openings, fill each square with lightly compacted or water-settled screened soil and fertilizer until it reaches about 1/2" below the top. Openings may then be plugged, sprigged, or seeded. Note: Hardy grasses, such as Bermuda or Emerald Zoysia do well. Regular watering and protection from traffic is critical during the first few months until the root systems have spread.