If you have ever tried to mark off long curved lines by hand, you probably know that it is not easy. What seems like a nice curved line while marking ends up with it having strange bumps and not so smooth curves. A trick to laying out very nice curves is to use several long lengths of 3/4 inch pvc pipe. I prefer using schedule 20 irrigation pipe, as it is already in 20 foot lengths and one end of each pipe has a bell end, so they slide together.
As you can see in the photo, the pipe allows you to lay out the curves and continually adjust them until you have the shape you want. I use concrete form board spikes to hold my pipe in place. Once happy, take a can of marking paint and mark off the curve. In the case of this photo, once marked, I ran a bed-edger along the long curved lines to create the new bed space. More time was spent adjusting the pipe and setting the lines than actually running the bed edger machine. But in the end, the pipe allows you to create beautiful flowing curves over long distances. In the case of this photo, I was using 120 feet of pipe to create the long bedlines.
We use the same trick in marking off curves on patios and walkways made of concrete, pavers, and stone. It is nearly impossible to
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free-hand mark a long flowing curve, but with a few pieces of fairly inexpensive PVC pipe, it becomes quite easy.
Here is an example, if you wanted to mark off an exact circle in the ground, you can either place a stake in the center and tie a string at the desired radius, then mark the circle by walking around with the fixed length string. A long piece of PVC pipe can be looped into a circle, and it will be in a near perfect circle that can be laid on the ground. and marked. A garden hose provides something to follow, but it does not provide the near perfect curve.
We mainly use PVC pipe to mark curves in our hardscape projects. It allows us to mark a nearly perfect curve and then saw cut the patio and walkway curves.