Hey Rance,..I've done many roofs by myself as well,..I've always use my PW to keep things wet,...I would soak everything,..then go up the ladder,...spray the edge,..come back down and spray plants again,..go back up the ladder and work my way to the next edge,..repeat. The sprinklers are a good idea,..but where's the exercise in that,Ha,Ha,...
*Maybe he did have sprinklers running,..just didn't see anything from the camera is all.
Jeff