Step 9: Other Examples - 2
As you can see, cracks do form, and weeds do grow in the cracks. A string trimmer takes care of most of the weeding.
People tend to step on the edge of steps, instead of in the middle of the step. The steps tend to get damaged on the front face of them because of that. I make the front faces thicker now when I make steps. Also, tree roots can grow under the thin layer of cement and break the step as the root grows. If roots rot away under the cement, they cause hollow areas, which can cause the nylon-cement to break and sink in under the weight of a person.