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(continued from page 7) provides for good drainage at the surface and makes the firelane or parking area not only safer but more durable. Do a site inspection when the base is installed to ensure the depths are accurate and drainage is effective. Base Course Design Calculating the depth and composition of materials for the base course incorporates the same design criteria as for other pavements: • load bearing capacity of native (or fill) subsoil • plasticity or impact of moisture on strength and longevity • frost heave potential • traffic load, frequency andor duration. Sample Base Course Depths Please consult with a soils engineer for site-specific base requirements. Generally, the depth that is used under asphalt will be the requirement under Grasspave2. Golf carts and pedestrian traffic may require nothing over sandy gravel soils, and just 2" to 4" (5-10 cm) over very weak soils. Cars usually need 4" to 8" (10.20 cm). Buses, trucks, and fire trucks can easily require 8" to 12" (20.30 cm) or more. The use of geotextiles, though not required, below the base will prevent integration with subsoils and is strongly advised in areas of clay or silt soils and frost heave. Filling Grasspave2 with Topsoil Is Unwise Remember that we are building a road- way with grass as the surface. Maintaining porosity for air and water movement is very important. When organic, clay or silt particles are in the rings, compaction can take place within the small cells, defeating the structure, and restricting access by air and water to roots. Growing grass in sand over a sandy gravel road base is more difficult to get established, but horticulturally and structurally it works! If ruts should appear in a finished installation, topsoil has been used either under the rings or within the rings, contrary to our installation instructions. 5639 ensure that the root system is well established. Seeding allows total customization of plant selection and eliminates possible con- tamination of the root zone from clay based or high peat content sod, both problems with high use areas. 92% Root Area and 100% Grass Coverage Our installations are hard to find because they are invisible! With so little plastic near the crown of the grass, the blades of grass are not smashed by product. Root development is not inter- rupted from spreading laterally. The rings are strong and rigid, Dupont Center, Irvine, U —Fre department testing of Grostpavez with sand -filled dogs to determine stability of outriggers when ladderwar extended Below. rirelane shown years later. Grass enhanced Me landscaping and softened the appearance of this building. Seeding Grasspave2 Is Popular In California and other temperate climate zones many of our installations are seeded. Waiting for a period of two mowings will keeping grass root systems protected from harm. The roots grow directly downward and deeply into the sandy gravel base course. Grasspave2 by Invisible Structures is, by far, the best possible "living" paving surface designed by a landscape architect. Grasspave2 Uniqueness • Large rolls for fast installation — 10 to 125 m2 • 92% root area for best grass growth • Strong rigid rings that conform to undulating terrain with flexible grid between rings • 100% recycled post -consumer plastic • Hydrogrow — polymer, fertilizer, soil amendment provided free • Rolls can be cut and shaped with pruning shears CSI Grants Specification Number 0179SParousftng — Recognition by CSI has helped establish legitimacy to the porous (grass and gravel) paving indus- tries. Now we can all agree on 02795! As designers expand their use and acceptance of porous paving, the industry will grow. Creativity With Hard Surface Pavers Ideas include: Combine Grasspave2 with flush paths, pads or mark- ers of concrete in a firelane for pedestrian traffic, design elements or delineation; use brick pathways through the grass; fill the rings with other plant materials such as daisies and ground covers; lay strips of concrete to define parking areas, especially handicapped parking; checkerboards of grass and pavers or other patterns to be enjoyed from high-rise offices; design of company logos in the parking lots or frelanes with polymer -bound colored stone; narrow residential streets with guest parking on grass shoulders.