I am in the process of designing and building my own residence in Toronto. To manage costs and learn various building trades, I am attempting to perform all the labor myself. I had worked on asphalt, metal and cedar shake roofs before. Slate was new. I used the slate roof installation guide for all unanswered questions through my reading and internet research. Installing the slate is not complicated, at least no more than any other roofing material. But you have to take care of all the transitions. It seemed to me that flashing roof transitions and penetrations was the most tedious and difficult part of the job. The entire process was a big learning experience, frustrating at times, rewarding at others. Along the way I came across a few issues that were difficult to resolve: Valley flashing Copper Flashing Supplier Organic Felt Can anyone here help me solving these issues? Thanks!