How to Install a Flagstone Walkway With Concrete


Installing a flagstone walkway with concrete is a fairly challenging do-it-yourself project. Building with concrete rather than sand has several advantages though: a concrete base will ensure a more solid and stable foundation and concrete requires little maintenance over the years. Although installing a flagstone walkway with concrete might be a challenging, time-consuming project, the money you can save by doing it yourself can make it worthwhile.

Step 1

Measure out the area for your flagstone walkway and use wood posts with string tied along the outside to mark the border.

Step 2

Call your city's building department and find out if you need any special permits or licenses before you begin building.

Step 3

Call your utility provider and ask them to come to your house to check for any underground wiring that would prohibit digging.

Step 4

Excavate the entire digging area that you measured out with a shovel.

Step 5

Compact the surface of the soil down using a hand tamper.

Step 6

Line the inner border of your walkway with two-by-fours cut to the length and width of the area. Attach the two-by-fours to each other using screws.

Step 7

Pour a 2-inch layer of gravel into the hole and use a hand tamper to compact the gravel down tightly.

Step 8

Mix the cement according to the package instructions and pour a 3-inch layer of concrete over the entire gravel base.

Step 9

Use a shovel to spread the concrete around and ensure the concrete is filled in thoroughly.

Step 10

Level the concrete out by dragging a two-by-four across the top surface several times until it's flat and even.

Step 11

Allow the concrete 24 hours to dry.

Step 12

Mix the mortar according to the package instructions and pour a 1-inch layer of mortar on top of the concrete base, enough for one flagstone at a time.

Step 13

Use a trowel to spread the mortar into an even 1-inch layer.

Step 14

Place the flagstones on top of the mortar one at a time, starting in any corner of the walkway.

Step 15

Pound each flagstone tightly into place with a rubber hammer.

Step 16

Allow the mortar 24 hours to dry.

Step 17

Mix the sanded grout according to instructions and use a grout sponge to spread it around and into the spaces between each of the flagstones.

Step 18

Let the grout dry for 12 hours and clean the surface of the flagstones before using.

Things You'll Need

  • Flagstones
  • Wood posts and string
  • 2-by-4s
  • Screws
  • Concrete
  • Mortar
  • Trowel
  • Rubber hammer
  • Sanded grout
  • Grout sponge
  • Hand tamper or plate compactor
  • Gravel


  • Dulley: How to Set a Stone Walk or Patio
  • This Old House: How to Lay a Flagstone Walkway
  • The-landscape-design-site: Laying Flagstone Walkways and Patios

Who Can Help

  • Monument Masonry: Flagstone Calculator
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About this Author

Scott Christ has been writing professionally since 2003. He works as a writer for a health care communications company in Michigan. He also runs a freelance copywriting business that specializes in marketing and communications materials for the health care industry. He holds a Bachelor of Arts in business administration from Michigan State University.

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