Garden Guides | How to Lay Flagstone on Decomposed Granite
Feb 04, 2010 · Step 11. Sweep any sand off the surface of the stones, and the patio is ready to use. Compact the decomposed granite down tightly with a plate compactor, which can be rented from a store that sells building materials. If you're using loose flagstones, leave around one inch of space between stones. 00:00 00:00.