Agatha that is abou the size of it, I think I might skim the top of the grass,not sure if added value but the erxercise will do me good,then I will put down the membrane, I always noticed that some people still have grass grown at the edges even after membrane put down, so I will remove all grass from edges and di small trench and tuck in the membrane into the trench, like th eway th emake a bed up in a nice hotel,or as you do to your little ones at night. feel free to ask anymore Q, have gardener in the family,