The defining feature of my current project is a circular cobblestone patio in Asheville’s historic Montford neighborhood made of materials gathered by the homeowner over the last 30 years.
The cobblestones are very diverse; I’ve found at least three distinct types of granite. They have all weathered differently and some are quite smooth from years of use as roads. Since there was a limited supply, I split most of them in half lengthwise. This effectively doubled my stone supply and added colors to the palette. While the top might be a granite grey, or green with algae, the bottom may be brown or orange, depending on the type of soil it has been sitting in for the last few decades. Once split, the inside of the stone also became a usable surface, always much brighter and sparkly than the weathered outside. A couple of the stones actually have old paint on them, from their days as roadways. As a result the cobblestone patio is quite colorful.
I have tried every different way I know to cut stone and have found the most efficient and neatest way to split the cobbles is using a type of chisel called a hand tracer. I scribe a line all the way around and around the cobble until it splits in two. The grain of granite is ideal for this type of technique; it’s very hard, dense stone, but it responds predictably to the chisel’s persuasion. The local metamorphic stones are less cooperative. I start out lightly, making sure the line is fairly straight and well established before I really lay into the stone. Once I get going, I can hear the stone starting to split, and I ease up, paying more attention to the places where it still sounds solid. A sharp chisel is a huge asset and I have been bringing the hand tracer home every night for a run over the bench grinder.
Cutting A Stone Circle
I used the hand tracer to remove large chunks of the center stone, a circle cut from a another salvaged piece of granite. I didn’t have a compass large enough to draw a circle on the stone, so I made one with roofing felt, a nail and some soapstone. I traced the circle on a piece of roofing felt and then laid that template over the stone.
Once I had the basic shape of the circle cut, I switched to my smaller, sharper chisels, which give me more control, to hone a more accurate shape. Though the patio needs one more ring to be completed, I dropped the circle stone in the center on Friday afternoon, to check the fit. The whole cobblestone patio makes me think of a flower.