Hi, I apologize if this has been covered already. First of all, we live in a cold area of Canada. Home reno included moving a doorway, the old now has an exterior of plywood that comes well below the level of the old parging, but not near the ground. This was done by a contractor, however we need to re-parge the outer foundation ourselves. We have never done this but we cannot find anyone to do it, and I want to make sure it is done right. I am stumped of what to do when we get to the plywood to have a seamless wall that will not crack. Help?