How to Lay Flagstone on Cement
Laying your own flagstone on cement is an easier project than you may think. With a little sweat and hard work, you can do the job yourself and save hundreds of dollars. Laying flagstone over cement requires very few materials. It's important to use thin-set mortar, not regular mortar, because thin-set mortar has the flexibility to expand and shrink a bit with the winter cold and summer heat. This will prevent your flagstone from cracking or coming loose. Does this Spark an idea?
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Things You'll Need
- Flagstone
- Power washer (or garden hose)
- Thin-set mortar
- Grout
- Tan or terra-cotta powder color additive for grout
- Trowel
- Damp cloth
Instructions
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1
Power-wash the concrete where you will be laying the flagstone, or if you don't have a power-washer, use the spray feature of your garden hose. Allow to fully dry.
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2
Mix the thin-set mortar according to the package directions. Each brand of mortar will have slightly different directions.
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3
Spread a layer of mortar 1/4 to 1/2 an inch thick on the side of the flagstone that will face down against the cement. Lay the flagstone against the cement and press down slightly.
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4
Continue laying flagstone, leaving gaps in between each stone, as large or small as you like to fit your aesthetic. The stones should not sit flush against one another.
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5
Once you have finished laying down all your flagstone, give the mortar 24 hours to set and dry.
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6
Mix the powdered color additive with your grout if you're using it. Apply grout in between the stones, smoothing it with your trowel.
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7
Wipe away the excess grout with a damp cloth. Allow 24 hours to dry.
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