What Do You Put Under Flagstone Pavers?

When it comes to installing flagstone pavers, it's crucial to lay a solid foundation that will provide stability, longevity, and proper drainage. The material you choose to put under flagstone pavers is just as important as the paving stones themselves. There are several options that you can consider, each with it’s own advantages and disadvantages. These options range from a simple layer of sand to more advanced methods that involve using a combination of materials. By understanding the different options available and considering factors such as budget, climate, and intended use, you can make an informed decision about what to put under your flagstone pavers, ensuring a durable and beautiful finished result.

What Do You Put Under a Flagstone Walkway?

What do you put under a flagstone walkway? When it comes to dry-laid flagstone, which refers to the method of placing flagstone pieces directly on a bed of sand and gravel, a proper base is crucial. For optimal stability, it’s recommended to have a patio or walkway base that’s at least 3 inches deep. This base should consist of a layer of compacted gravel that’s then covered with a layer of coarse sand.

The first step in preparing the base for a flagstone walkway is to excavate the area to the desired depth. This will typically involve removing any existing grass, plants, and topsoil. Once the area is cleared, a layer of gravel should be spread evenly across the excavated space. This gravel acts as a foundation, providing stability and preventing the flagstone from shifting or sinking.

After the gravel layer is in place, it should be compacted using a plate compactor. This will help to ensure a solid, level surface for the flagstone. Once the gravel is compacted, a layer of coarse sand should be spread evenly over the top. This sand layer serves as a cushion for the flagstone, allowing for slight adjustments and ensuring a level surface.

When the sand layer is in place, the flagstone can be laid directly on top. The pieces should be positioned closely together, with the edges snugly fitting together.

Tips for Choosing the Right Type of Flagstone for a Walkway

When it comes to choosing the right type of flagstone for a walkway, there are a few key factors to consider. First and foremost, you’ll want to evaluate the durability of the flagstone. It should be able to withstand foot traffic and outdoor elements without cracking or chipping.

Additionally, the color and texture of the flagstone are important considerations. You’ll want to select a color that complements the overall aesthetic of your landscaping. The texture should provide enough traction to prevent slipping, especially when the walkway is wet.

Another factor to keep in mind is the thickness of the flagstone. For a walkway, thinner flagstones are generally easier to install and create a more level surface. However, if you’re using flagstone for a patio or driveway, thicker stones may be necessary to withstand heavier loads.

Lastly, consider the size and shape of the flagstone. Irregular shapes can create a more natural and rustic look, while uniform shapes provide a more contemporary feel. The size of the flagstone should be proportional to the scale of your walkway.

By taking these factors into account, you can select the right type of flagstone that suits your needs and enhances the beauty of your walkway.

When it comes to securing flagstone, there are a couple of tools and materials that you can rely on. One option is to use a hand tamper or rubber mallet to firmly secure the flagstone into the sand base. This helps to ensure that the stone stays in place and doesn’t shift over time. Additionally, you can use mason’s string as a marker and a level to make sure that your stones are as level as possible. By adjusting the sand underneath the stone, you can achieve the desired levelness.

What Do You Secure Flagstone With?

When it comes to securing flagstone pavers, there are a few methods that you can use. One popular option is to use a hand tamper or rubber mallet to firmly secure the flagstone into the sand base. This will help to ensure that the stone is stable and doesn’t shift over time.

Before placing the flagstone, it’s important to mark the area and ensure that the stones are as level as possible. You can use masons string as a marker and a level to achieve this. If you find that a stone isn’t level, you can remove or add sand underneath it to make the necessary adjustments.

After placing the stones in the desired pattern, you can fill in the gaps between the stones with a mixture of sand and mortar.

It’s important to note that the type of base and the climate in your area can impact the method you choose to secure flagstone pavers. For example, in areas with freeze-thaw cycles, using a sand and mortar mixture may be more suitable to prevent damage from shifting due to temperature changes.

In addition to securing the flagstone itself, it’s also important to properly prepare the base. This typically involves excavating the area to a suitable depth, compacting the soil, and adding a layer of sand to create a stable foundation for the flagstone.

How to Seal Flagstone to Protect It From Stains and Weather Damage.

  • Clean the flagstone thoroughly using a mild detergent and water to remove any dirt or debris.
  • Allow the flagstone to dry completely before sealing.
  • Choose a sealer specifically designed for flagstone surfaces.
  • Read and follow the instructions provided by the manufacturer on the sealer packaging.
  • Apply the sealer evenly on the flagstone surface using a paintbrush or roller.
  • Allow the sealer to penetrate the stone for the recommended amount of time.
  • Wipe off any excess sealer with a clean cloth or sponge.
  • Let the sealer dry completely before exposing the flagstone to foot traffic or water.
  • Repeat the sealing process every 1-3 years or as recommended by the sealer manufacturer.
  • Avoid using harsh cleaning chemicals or abrasive tools on sealed flagstone.
  • Regularly sweep or hose down the flagstone to remove dirt and prevent staining.
  • Consider using a breathable sealant to allow moisture to escape from the flagstone.
  • Monitor the condition of the sealant and reapply as needed to maintain it’s protective benefits.

Source: How To Install A Flagstone Patio – Rockland Supplies


While various options are available, such as packed gravel, sand, or landscape fabric, it’s imperative to take into account the specific conditions and purpose of the project.

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