I tore my old wood deck out and am planning to lay pavers on top of the concrete slab that was beneath it.
I'm following the instructions here, photo below:
The inner paver bricks will have a layer of sand underneath them, so they will be level. But the border pavers are just glued down.
But this seems to be assuming the top of the concrete slab is finished... mine is very rough:
What can I do to level the concrete before laying the border pavers on top of it? Or is that not necessary, can I just glue them to the rough surface?