Ok, I'm just a home owner. I'm building the wife a raised garden since we have horrible georgia clay. I am making a 16' x 6' rectangular garden out of landscaping timbers. I have purchased top soil, peat moss, and manure compost to put in there. I am going to seal the wood in hopes of keeping the termites from eating it. Should I screw the posts together or drill holes and bolt them together? What should I do to prevent the rain from washing out the soil from under the wood?