How to Use Decomposed Granite for a Flagstone Patio

The natural beauty and weather resistance of flagstones make them an attractive choice for landscape surfaces. Decomposed granite is loose granite broken down to a sandy consistency mixed with 1/4-inch pieces of stone. When used as a base for a flagstone patio, decomposed granite offers a water-penetrable, sturdy surface to support the stones and keep them from shifting around.

Wood stakes
String
Shovel
Tamper
Edge restraints
Hammer
Nail spikes
Decomposed granite
Rake
Course sand
Flagstones
Wood board
Fine sand

Instructions

- 1
  Walk your yard and consider the best location for your patio. Decide on the size and shape of the site and use wooden stakes to mark the corners. Run a piece of string around the corner stakes.
- 2
  Unearth an 8-inch deep expanse within the outline using a shovel. Flatten loose dirt with a hand tamper until the subsoil feels firm.
- 3
  Fasten edge restraints to the ground against the inner walls of the expanse. Use a hammer to drive nail spikes through the slots.
- 4
  Pour decomposed granite over the base of the expanse and spread it out with a rake. Tamp the decomposed granite to form a solid, 4-inch thick base.
- 5
  Rake 1 1/2 to 2 inches of course grit sand over the granite base. The sharp, irregularly shaped granules offer traction to keep the flagstones in place.
- 6
  Set your flagstones over the bed of sand in your planned pattern. If the stones are different sizes, place the largest stones first and fill in spaces with medium and smaller stones. Leave consistent spacing between the flagstones. Even out each section by laying a wood board on top and walking on the board to apply even pressure.
- 7
  Sweep fine sand into cracks with a shop broom. Pack it down and add more until the joints are completely full.

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