I WANT TO BUILD A RAISED PATIO IN MY GARDEN I'VE BUILT A 1 FOOT HIGH WALL AND NEED TO NO HOW MUCH HARDCORE ETC TO FILL THE AREA WITH BEFORE LAYING SLABS. IS THERE A EASY CALCULATION CHART ? THE MEASUREMENTS ARE 7.8M X 4.8M AND THE DEPTH IS 300MM ?
CAN ANYONE HELP !!!!!!!!!!!!!!![/b]