Landscape Material -» Landscape Stone -» Flagstone Flagstone can be fine grained sandstone, bluestone, limestone or slate (other stones may be used) that have bee quarried and broken or cut with a machine. Flagstone is used for paving walks and patios. Stack flagstone is used for dry joint or (stack) construction of walls, planters or borders. Cobblestone is used primrily for paving drives and walks. Strip rubble is used for walls and veneer on buildings. We also provide a line of stairtreads, mantles, and capstone for the finishing touches on your project Custom sizes can be special ordered. Thin Flag Medium Flag Thick Flag Thin Stack Medium Stack Thick Stack Garden Bench Castle Blocks Rubble Stairtreads