3. Install header boards
Excavate soil in the layout of the header board to a depth of 1". This provides for the decomposed granite to be 3" deep for the path surface (1" of soil, 3" of decomposed granite). Next, secure your header boards by anchoring them with stakes about every four feet.
4. Add a weed barrier (optional!)
If you’re worried about weeds, pick up a weed barrier when you purchase your decomposed granite. Spread out the weed barrier fabric along the length of your path before adding any layers of DG.
5. Add the first layer of Decomposed Granite
Fill the area between the header boards with a 1.5” thick layer of the decomposed granite. Thoroughly soak the material with water. Allow the moist decomposed granite to sit for about eight hours and then compact it with a heavy roller or a vibrating plate compactor. Don’t have a compactor? For informal paths, place a flat slab of wood onto the DG and walk on it for a quick DIY fix.