I will be building a raised garden bed with concrete blocks as the barriers. I don't plan to use dirt from the ground in my raised garden. I will be buying compost, soil, and pete moss. I wanted to know if it would work to put a weed barrier on the bottom of my raised garden before I put the soil in. It would have holes in it of course for drainage. But is it okay to layer the entire bottom of the bed with the weed barrier? Thanks!