When preparing to install a new lawn the best method is to loosen up the ground you are going to lay your new turf on. However with access you can also spray off your old lawn with roundup (purchased from your local hardware) and then spread a layer of top soil to create a new surface. This can sometimes be the easier option, at Southern Cross Turf we can assist in supplying your top soil requirements. You should always spread top soil to a thickness of 25mm to 50mm.