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Installing a Flagstone Patio on a Stonedust Base

 
 


Picture of grey flagstone patio built on a stonedust base
Flagstone patio on a stonedust base

A flagstone patio can add years of enjoyment to your outdoor living. You can do it yourself with patience and hard work and following the tips and guidelines we've outlined below:

Step 1
Using a hose or paint, mark out the area you want to turn into a path or patio. You may want to consult with one of our designers, who can draw a to-scale plan showing exact dimensions and grades based on your requirements. Once you have marked out the shape, it's time to start digging!

Step 2
Assuming the grade is constant, you need to remove at least 6-8" of existing dirt within your line. Back to top

Step 3
After removing the dirt, you need to lay your edging. This can be steel, aluminum, brick, or cobblestone. The edging keeps the base material as well as the surface material contained. Make sure to check the grade and level of the edging on both sides as you go. If you don't, the grade may be all wrong by the time you need to put down your path or patio. Allow at least a 1/4" drop away from the house for every 1' to allow for drainage. Back to top

Step 4
Once your edging is down and correctly graded, put in a 2" layer of #57 gravel. Tamp this down with either a gas-powered tamper, which we recommend, or a hand tamper. You can rent gas-powered tampers from most equipment rental stores. Back to top

Step 5
Now you need to lay some fabric on top of the gravelto keep the materials separate. Back to top

Step 6
The next material you'll lay can be either stonedust or sand. Make this layer at least 4" thick. Once again use the tamper to pack this material down firmly. You'lll find that you may have to add material a couple of times after you have gone over it with the tamper. The edging should rise above the stonedust or sand about the thickness of the flagstone, so once you've installed your flagstone, everything is flush.

Note: This is the most important step, for without a good solid base, your flagstone constantly shift and move.
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Step 7
Install your flagstone. You will need to rent a "cut-off saw." You should start working from one point, which allows you to place a regular section without cutting. Work your way to the edges and lay the piece of stone to be cut in position, so it lays over the edging. Mark the underside of the stone with a pencil or crayon where it meets the edging. Lift this stone, flip it over, and use the cut off saw to cut where it was marked. Once it's cut, flip it back over, and it should fall right into its spot! Back to top

Step 8
Once the entire flagstone patio or path is cut, you now have to come back through and level each piece. Due to the variables in stone, you may have to add some stonedust or sand here and there to account for its thickness. This takes a great deal of patience. Once this is done all you have to do is sweep either sand or stonedust into the joints and you're finished!!!

Note: For at least the first year after you install your patio, you will find that you have to come back and sweep more stonedust or sand into the joints (at least two or three times) until it has packed down enough.

Now it's time to add your patio furniture, sit back, and enjoy!!

 
 


Office:
703-791-5363
Fax:
703-791-0924
E-mail:
Englishcogardens@aol.com

 

 
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