... road surface from collapse, crack and being dirty.3. Be convenient for construction, timesaving and cut down the cost of ... thickness of the ground.7. Consolidate the net for growing grass on the slope so as to ... not more than 10cm), rolled into a platform for laying grille, the vertical axis should be the ... lap 15-20cm, horizontal 10cm, lap Service With plastic wrap and lay in the grille of every 1.5 ...