So I have a fairly new house, and gone through some issues with chimney boot/flashing installs. Without going into a historical rampage, I have had two chimney sweeps (members of the guild) and one roofing guy install/repair the two chimneys. All were favorably reviewed and well recommended. Nevertheless, my chimneys still leak. Currently we have silicone boots installed. one is failing and the other has a slight leak. I'm planning on having an Excel chimney flashing installed by another roofing guy. I will be supervising this install very closely, but was hoping that some of you who have experience with Excel flashings will give me any relative tips. I have a 12/12 standing seam Fabral roof. The chimneys are very close to the roof ridge--several inches from the ridge. See pictures for a visual. One is 6 inch (stove in basement) and one 8 inch for the masonry heater (1st floor). I look forward to ideas. I know there are some fans of boots, but I've been down that road, and am uncomfortable with silicone boots that are heavily dependent upon sealants for a water-proof seal.