My landlord wants to put in rock in front of my house. It is over 900 Sq feet. We are going to dig down the dirt with a skid and put the rock on top. We are also going to divide the area in half and put in 2 different shades of rock. The landlord doesn't seem to think that we need to put down the fabric/plastic barrier before we lay the rock. I seem to think we do. Thoughts?