Flagstone is a type of is a generic flat stone, usually used for paving slabs or walkways, patios, fences and roofing. 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 silica, calcite, or iron oxide. The rock color usually comes from these cementing materials. Typical flagstone colors are red, blue, and buff, though exotic colors exist.
These type of slim stones stacked into a low wall make an attractive way to delineate space and add a sense of structure to a landscape. you can use it in the front or backyard (most frequently they are designed for the backyard areas).
Remember the differences in stone thicknesses make it almost impossible to build a flagstone wall with an exact horizontal top and a perfect edge. It’s much easier to fit the flagstones without regard to thickness, and then choose flat pieces to create a level top. Low walls also can provide additional seating or a platform on which to display potted plants.
How to build a simple flagstone wall:
- Dig a trench a couple of inches deep and wide enough to accommodate the flagstones.
- Fill with pea gravel and/or sand and tamp to make level. A depth of 2″- 4″ is more than enough to have a good drainage
- Lay out the flagstones to see their shapes and sizes, and try to imagine how they will be pile up in the final wall.
- Stack the smaller stones first.
- Save the largest, prettiest flagstones for the top layer.
- Backfill with gravel (3/4 to 5/8 inch size)
If you are planning to have a great finish choose a stone of consistent thickness. Flagstone might be limestone, sandstone, shale — any rock that splits into slabs.
The cost? Be ready to spend between $300 – $500 for stones and sand for a wall 10-12 feet long and 1 foot tall. Of course the price here depends on the region you are buying the materials. Big stores like Home Depot or Lowe’s have plenty of options with good prices.