Apple cider vinegar can be diluted half-and-half with water for external application, and, when stronger measures are needed, it can be used full-strength.
1 Just the stone for a flagstone patio can cost $3 -$5 a square foot or more, depending on location and the type and quality of stone, or about $600 -$1,000 for an average patio up to 10'x20,' and $1,200 -$2,000 for a larger 20'x20' area.
From there, the pricing is extremely variable, with Techo-Blocâs Monticello paver being one of the more expensive Iâve seen (but a really cool product). In general, a normal-sized patio or walkway runs from $15 to $22 per square foot installed.he cleanest, most maintenance-free installation method is to pour a new concrete slab with the flagstone wet-laid with mortar. For rectangular patterned flagstone, the installed price ranges from $18 to $33 per square foot.