I have a slate stone front walkway laying on a mortar. That's an old house and so old walkway. I hired a Contractor to redo it. There is a procedure the job was done: removed the slate slabs, put a roll of sick plastic on a ground (to prevent a grass and weeds growing??? - but what about the water accumulation and lock of draining?),put a layer of a DUST STONE???, but not a Q-P stone as stated in a Contract, than pour a mortar and RIGHT AWAY placed a slate stones slabs without preparation a concrete base bed. Than filled the spaces between the slabs with the same mortar. The wood frame wasn't installed at all, as a result the edges are not straight and walkway itself not leveled and has wavy surface. All job was done in about a 4-5 hrs. In addition to that the finished walkway wasn't cover with a plastic to let the mortar to cure and newly done job stood unprotected from fallowed several-hours-in-a-raw shower. Do anybody have an opinion about the way the job was done? Will be very appreciated.