I am enclosing a patio and plan on using a ledger board to tie the roof into the rim joist. The house is sided with Hardipanel fiber cement and has a flat surface. Behind the Hardipanel is hardiwrap which covers the panel siding they used in the early 80s that reminds me of layers of cardboard pressed and sealed. I don't know if I should just attach the ledger board through everything and into the rim joist or cut away material to get a better connection with the rim joist. I fear cutting away something and needing to flash everything, when I currently have a water barrier. Once I connect the roof it will be trimmed with 5" harditrim that I plan on gaulking the top of the trim board so no water can get behind the trim. Any suggestions?