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Flagstone Installation

Flagstone, often referred to as Natural Stone is a sedimentary stone that is split into thin layers.   It includes slate, limestone, sandstone, bluestone, and travertine. Flagstone is usually laid on concrete using mortar as the joining adhesive. It is a great way of adding curb appeal to your home or business. Mr.Sod can install flagstone on an existing concrete surface or we can pour a new concrete slab to install flagstone on.  Popular applications for flagstone in Ontario include porches, pool decks, and patios.

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How is flagstone installed?

Installing flagstone using a concrete base is a method that combines the stability of a concrete foundation with the natural and rustic appearance of flagstone. Here is a step-by-step guide:

  1. Site Preparation: Clear the area of vegetation, debris, and any existing materials. Ensure proper grading for water drainage away from structures.

  2. Excavation: Excavate the area to the desired depth, considering the thickness of the concrete base and the flagstone. Typically, a depth of 4 to 6 inches is suitable for pedestrian applications.

  3. Forming: Create forms using wooden or metal boards to define the shape and dimensions of the concrete base. Ensure that the forms are set at the correct height and are level.

  4. Rebar Installation (Optional): For added reinforcement, install a grid of reinforcing steel (rebar) within the concrete. This is especially useful for larger areas or applications with heavy loads.

  5. Concrete Base Preparation: Mix and pour the concrete into the forms, spreading it evenly and ensuring it reaches all corners. Consolidate the concrete with a screed to achieve a smooth and level surface.

  6. Finishing: Finish the concrete surface using a trowel or float to create a smooth, even finish. If you desire a textured surface, consider using a broom or other tools to add texture before the concrete fully sets.

  7. Curing: Allow the concrete to cure and gain strength. Curing times can vary, so follow the recommendations of the concrete mix manufacturer. Proper curing is essential for the concrete to achieve its full strength and durability.

  8. Layout Planning: Plan the layout of the flagstones. Consider the desired pattern, spacing between stones, and any specific design elements.

  9. Setting Flagstones: Once the concrete is fully cured, set the flagstones onto the concrete surface. Arrange them according to the predetermined design. Space the flagstones with small gaps to allow for jointing material.

  10. Mortar Application : For added stability and to create a more solid surface, you must apply mortar between the flagstones. Use a mortar mix suitable for outdoor use.

  11. Joint Filling: Fill the joints between the flagstones with jointing material. This can be mortar or a polymeric sand, depending on your preferences and the desired appearance.

  12. Final Adjustments: Adjust the position of the flagstones as needed, ensuring they are level and properly aligned.

  13. Clean-Up: Clean the surface of the flagstones from any excess mortar or jointing material.

  14. Sealing (Optional): Depending on the type of flagstone used and your preferences, consider applying a sealer to enhance color, protect against stains, and improve durability.

  15. Final Compaction: Compact the entire surface using a plate compactor to set the flagstones and jointing material in place.

By following these steps and paying attention to details, you can create a visually appealing and durable flagstone installation on a concrete base. Properly installed, this type of surface can withstand foot traffic and outdoor conditions for years to come.

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