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Apply a thin aggregate layer of sand, crushed stone or grit over the membrane. Compact it to create a solid base. This layer will provide you with a firm, well-draining surface that will support the rest of the materials.
Once the layer of aggregate is in place, apply a 1/2- to 3/4-inch (1 to 2 cm) layer of sharp sand. Compact the sand and level it, smoothing the surface using a piece of wood or a flat board with a level.
This step is optional, but you may want to consider it to give the grass more cushioning. Square the sheet with one corner of the lawn, then cut it to shape using a utility knife.
Simple Steps to Success: Lawns and Groundcover © 2012 Dorling Kindersley Limited