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What is flagstone?

Flagstone is a sedimentary rock that is split into layers along bedding planes. Flagstone is usually a form of a sandstone composed of feldspar and quartz and is arenaceous in grain size (0.16 mm – 2 mm in diameter). The material that binds flagstone is usually composed of silicacalcite, or iron oxide. The rock color usually comes from these cementing materials. Typical flagstone colors are red, blue, and buff, though exotic colors exist.

Can flagstone be stained?

Yes, flagstone can be stained. While there are many methods, depending on the aesthetic you're looking for, the steps are essentially all the same. First, ​you need to clean the stone. Using a pressure washer will typically suffice, although some methods involve using acid. After the cleaning, the stone will need to dry for 24 hours.


Next, you apply the stain. This can typically be done by working the stain into the stone using a broom or brush. The flagstone will need to fully dry (24 hours). Then, you rinse the stone. If an acid based stain was used, you will need to neutralize the acid with a baking soda and water combination. Once the stone has been rinsed, allow for it to fully dry (24 hours). Finally, add a coat of sealer to the flagstone and let it fully dry (24 hours). Add a second coat and dry if necessary.

Can flagstone be painted?

Yes, with elastomeric latex paint. First, you want to wash the flagstone with a muriatic etching solution and sponge. Then, rinse the solution off of the stone and allow for the stone to dry. Next, apply a masonry primer.


Once the stone has been primed, you can begin painting the flagstone with elastomeric latex paint. This particular type of paint has special resins that fill small cracks and gaps and allow for a longer-lasting finish. Allow the paint 24 hours to dry before use.

Will flagstone crack under heat?

No, flagstone will not crack under heat. Flagstone is extremely durable and can last centuries, standing up to all forms of extreme climate. The only maintenance needed for flagstone is to keep it clean by sweeping and spraying it down every once in awhile.

Will bleach damage flagstone?

Yes, if used incorrectly. Bleach is a powerful chemical that can damage and discolor your flagstone. It is typically recommended that you mix one part bleach to 10 parts water and scrub the stone gently with a sponge. You may need to do this several times if the flagstone has become particularly dirty. Once it is to your satisfaction, it's recommended that you rinse with water a few more times and allow time to dry.

Can flagstone be laid over concrete?

Yes, it can be mortared to an existing piece of concrete or laid directly on top, although the mortared route is preferred. Flagstone is a unique paving surface in that it adds a beautiful, natural look to any patio or walkway with minimal maintenance needed.

Are flagstone walkways slippery?

As with most surfaces, flagstone can become slippery when wet, depending on the variation. Fortunately, our flagstones' natural rock face adds definition and traction to the surface area. Another tip to prevent a slippery surface is to spread a light layer of sand over the surface to further add traction and reduce slipperiness. 

Are flagstone patios expensive?

No, flagstone patios are not expensive. As far as flagstone as a material cost, it is not expensive. However, the labor and the method in which you create the patio can add additional costs. If you lay the flagstone freely atop one another, you can cut costs on labor and materials. The preferred route, however, is to use mortar to keep the stone in place and provide a clean, solid finish. 

Why does flagstone flake?

Flagstone doesn't necessarily flake on it's own. Flaking, also called "Spalling", is an indicator of sub-florescence , or a condition in which mineral salts and moisture mix and accumulate beneath the stones surface. This creates stress within the pores of the stone, and can be particularly damaging if the stone experiences freeze-thaw cycles. This can occur for multiple of reasons; reasons being  salts are inherent in the stone itself, de-icing salts, polluted rain water, improper cleaning methods, or  being in a moisture prone zone. Stone in this state typically needs to be replaced.

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