This silicone Chimney boot is designed to be used with double wall insulated chimney. We recommend the type with 1" insulation - 6" inner and 8" outer diameter which fits most wood stoves. It is installed with roofing screws through the dome cover and screws into a backing on the inside while sealing with silicone or Lexel.
A vinyl flashing can be glued with the specialized glue provided to make sure there is no risk of leaks.
A smaller size is available for Pellet and Gas stove vents that can go straight up or through the side wall.