Flagstone Patios

Material Types

Flagstone patios also have a very natural, organic look due to their shape and earthy shades of browns, reds, grays, and blues. The most common types of flagstone used for paving patios are sandstone, slate, and limestone. Flagstone provides a durable and naturally slip-resistant patio surface that Will last for years.
Most common are | Red Flagstone | Buff Flagstone| Pennsylvania Flagstone


Flagstone is installed on a compacted granular aggregate (roadbase) which should be between 4 and 6 inches deep. The depth of the base layer is influenced by the soil type and application. The base layer should be leveled and compacted firmly.

Once the base is in place, a layer of sand is added and leveled or screeded. Bedding sand should be at least 1-inch deep and spread evenly across the base material.

Flagstone is laid on top of the leveled sand. Polymeric sand is then swept into the joints between the flagstones.

Care and Maintenance

Cleaning Flagstone

You should regularly sweep your flagstone paving. This will ensure that loose dirt and plant debris do not sit on the stone for prolonged periods and cause stains. If spot cleaning of stains or mold is required bleach or muriatic acid diluted with water can be used. You may also use a cleaner developed especially for flagstone. 

Many home improvement stores will carry this type of product. Whenever chemicals, especially acids, are used to clean flagstone they should be rinsed off as soon as possible to prevent damage. If you have a large expanse of flagstone that needs cleaning, you can hire a professional crew to come give your stone new life. The same crew will likely be able to reseal the stone to prevent future stains.

Sealing Flagstone

All flagstone is subject to water stains, particularly in areas where the water supply is alkaline or contains minerals.

Stains are unavoidable in outdoor living spaces devoted to cooking and dining. For this reason, all new flagstone paving should be sealed upon completion. A sealer fills the pores in the stone and repels spills. However, be careful to avoid sealers with a glossy finish because this can compromise the natural beauty of stone.

Plan to use a penetrating acrylic sealer with a matte finish so that water and oils bead up when they land there. This sealer should be reapplied annually to protect the stone and retain its color over time.