From heavy 18 wheelers, fire trucks, and RV's to everyday auto traffic... TRUEGRID gives you a highly durable, 100 % permeable, maintenance-free paved surface. Pervious cover, stormwater detention in and under grid and a superior and eco-friendly paving surface made from 100% recycled HDPE plastic filled with gravel or grass. Helps reduce flooding. No more mud puddles or ruts. Works in all climates and soils. Fill with gravel or grass. Great for industrial yards, high traffic commercial and retail parking lots, roadways, storage lots, and virtually any other paving application. Stronger than concrete and less expensive too. Up to 60 year life. Be free from gravel migration, ruts, puddles and mud. Sold in boxes of 10 grid (40 Sq/Ft ) per box. How to install TRUEGRID? Base Preparation Grade project area to height of grid and sub-base (see details below) Lay sub-base if needed. A proper TRUEGRID installation requires consideration of sub-base needs. Laying Grid 1. Start in corner of project area with male tabs of first grid facing towards the center of the area 2. Line up female slots of next grid over male tabs of first grid. 3. Press down with feet to lock grid into place. 4. Repeat until area is covered with connected grid. 5. Gravel Fill: Fill grid with desired aggregate to top of grid. Lightly compact to settle. Grass Fill: Fill grid with soil and seed or sod.